diff --git a/.bithoundrc b/.bithoundrc new file mode 100644 index 00000000..46722b1d --- /dev/null +++ b/.bithoundrc @@ -0,0 +1,19 @@ +{ + "ignore": [ + "**/.vscode/**", + "**/node_modules/**", + "**/dist/**", + "**/examples/**" + ], + "test": [ + "**/test/**" + ], + "critics": { + "lint": { + "engine": "eslint" + }, + "wc": { + "limit": 1000 + } + } +} diff --git a/.eslintrc.json b/.eslintrc.json index 8c4a28cc..ac117e1a 100644 --- a/.eslintrc.json +++ b/.eslintrc.json @@ -24,6 +24,16 @@ "no-console": 0, "import/prefer-default-export": 0, "comma-dangle": 0, - "no-underscore-dangle": 0 + "no-underscore-dangle": 0, + "no-param-reassign": 0, + "no-return-assign": 0, + "no-restricted-globals": 0, + "no-multi-assign": 0, + "prefer-destructuring": ["error", {"object": true, "array": false}], + "padded-blocks": 0, + "no-sparse-arrays": 0, + "array-bracket-spacing": 0, + "import/no-named-as-default": 0, + "implicit-arrow-linebreak": 0 } } diff --git a/.firebaserc b/.firebaserc new file mode 100644 index 00000000..d33152ab --- /dev/null +++ b/.firebaserc @@ -0,0 +1,5 @@ +{ + "projects": { + "default": "javascript-ds-algorithms-book" + } +} diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 00000000..cdaaeff1 --- /dev/null +++ b/.gitattributes @@ -0,0 +1,40 @@ +# Handle line endings automatically for files detected as text +# and leave all files detected as binary untouched. +* text=auto + +# +# The above will handle all files NOT found below +# +# These files are text and should be normalized (Convert crlf => lf) +*.css eol=lf +*.df eol=lf +*.htm eol=lf +*.html eol=lf +*.java eol=lf +*.js eol=lf +*.json eol=lf +*.jsp eol=lf +*.jspf eol=lf +*.jspx eol=lf +*.properties eol=lf +*.sh eol=lf +*.tld eol=lf +*.txt eol=lf +*.tag eol=lf +*.tagx eol=lf +*.xml eol=lf +*.yml eol=lf + +# These files are binary and should be left untouched +# (binary is a macro for -text -diff) +*.class binary +*.dll binary +*.ear binary +*.gif binary +*.ico binary +*.jar binary +*.jpg binary +*.jpeg binary +*.png binary +*.so binary +*.war binary diff --git a/.gitignore b/.gitignore index 25cf67d5..0c2aa12a 100644 --- a/.gitignore +++ b/.gitignore @@ -6,5 +6,6 @@ coverage coverage.lcov mochawesome-report/* dist/js/* +dist-/* dist/ts/* snippet.js diff --git a/.travis.yml b/.travis.yml index 2cd47824..7def9b91 100644 --- a/.travis.yml +++ b/.travis.yml @@ -1,12 +1,15 @@ language: node_js node_js: - node +before_script: + - npm install -g --silent firebase-tools install: - npm install script: - npm run go after_success: - npm run coverage + - test $TRAVIS_BRANCH = "master" && test $TRAVIS_PULL_REQUEST = "false" && firebase deploy --token $FIREBASE_TOKEN --non-interactive notifications: email: on_failure: change diff --git a/.vscode/launch.json b/.vscode/launch.json index 24399b76..85c3207b 100644 --- a/.vscode/launch.json +++ b/.vscode/launch.json @@ -8,7 +8,7 @@ "type": "chrome", "request": "launch", "name": "Chrome", - "url": "http://127.0.0.1:8887/examples", + "url": "http://127.0.0.1:8080/examples", "webRoot": "${workspaceRoot}" }, { @@ -41,8 +41,9 @@ "-r", "ts-node/register", "--colors", - "${workspaceRoot}/test/ts/**/*.spec.ts" + "${workspaceRoot}/test/ts/**/**/*.spec.ts" ], + "protocol": "auto", "internalConsoleOptions": "openOnSessionStart" } ] diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 00000000..55712c19 --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,3 @@ +{ + "typescript.tsdk": "node_modules/typescript/lib" +} \ No newline at end of file diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 index 00000000..ade741a9 --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,7 @@ +# Change Log +All notable changes to the "javascript-datastructures-algorithms" third edition source code bundle will be documented in this file. + +Based on [Keep a Changelog](http://keepachangelog.com/). + +## [Unreleased] +- Initial release diff --git a/README.md b/README.md index 0be9ad9b..96845564 100644 --- a/README.md +++ b/README.md @@ -1,31 +1,68 @@ Learning JavaScript Data Structures and Algorithms ==================================== -[![Build Status](https://travis-ci.org/loiane/javascript-datastructures-algorithms.svg?branch=third-edition)](https://travis-ci.org/loiane/javascript-datastructures-algorithms) -[![codecov](https://codecov.io/gh/loiane/javascript-datastructures-algorithms/branch/third-edition/graph/badge.svg)](https://codecov.io/gh/loiane/javascript-datastructures-algorithms) +[![Build Status](https://travis-ci.org/loiane/javascript-datastructures-algorithms.svg?branch=master)](https://travis-ci.org/loiane/javascript-datastructures-algorithms) +[![codecov](https://codecov.io/gh/loiane/javascript-datastructures-algorithms/branch/master/graph/badge.svg)](https://codecov.io/gh/loiane/javascript-datastructures-algorithms) +[![devDependencies Status](https://david-dm.org/loiane/javascript-datastructures-algorithms/dev-status.svg)](https://david-dm.org/loiane/javascript-datastructures-algorithms?type=dev) +[![dependencies Status](https://david-dm.org/loiane/javascript-datastructures-algorithms/status.svg)](https://david-dm.org/loiane/javascript-datastructures-algorithms) +[![Greenkeeper badge](https://badges.greenkeeper.io/loiane/javascript-datastructures-algorithms.svg)](https://greenkeeper.io/) -Source code of **Learning JavaScript Data Structures and Algorithms** book, third edition. -Work in Progress. +Source code of **Learning JavaScript Data Structures and Algorithms** book, third edition. ## List of available chapters: -* 01: [JavaScript, ECMAScript and TypeScript: a quick overview](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter01) -* 02: [Arrays](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter02) -* 03: [Stacks](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter03) +* 01: [JavaScript: a quick overview](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter01_02) +* 02: [ECMAScript and TypeScript Introduction](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter01_02) +* 03: [Arrays](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter03) +* 04: [Stacks](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter04) +* 05: [Queues and Deques](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter05) +* 06: [LinkedLists](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter06) +* 07: [Sets](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter07) +* 08: [Dictionaries and Hashes](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter08) +* 09: [Recursion](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter09) +* 10: [Trees](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter10) +* 11: [Heap](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter11) +* 12: [Graphs](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter12) +* 13: [Sorting and Searching Algorithms](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter13) +* 14: [Algorithm Design and Techniques](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter14) +* 15: [Algorithm Complexity](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter15) -## Thrid Edition Updates +### Third Edition Updates -* Algorithms using ES2015+ -* Creation of a Data Structure and Algorithms library that can be used in the browser or with Node.js +* Algorithms using ES2015+ (ES6+) +* New data structures and algorithms +* All chapters rewritten and reviewed +* Three (3) new chapters +* Creation of a Data Structures and Algorithms library that can be used in the browser or with Node.js * Algorithms tested with Mocha + Chai (test code available in `test` directory) -* TypeScript version of the source code included +* **TypeScript** version of the source code included (library and tests) + +## Project Structure + +`src/js/index.js` file contains all the data structures and algorithms listed by chapter. + +``` +|_examples (how to use each data structure and algorithm, organized by chapter) +|_src +|___js (source code: JavaScript version) +|_____data-structures +|_______models (classes used by DS: Node, ValuePair, ...) +|_____others (other algorithms such as palindome checker, hanoi tower) +|___ts (source code: TypeScript version) +|_____data-structures +|_______models +|_____others +|_test (unit tests with Mocha and Chai for src) +|___js (tests for JavaScript code) +|___ts (tests for TypeScript code) +``` ## Installing and running the book examples With Node * Install [Node](https://nodejs.org) -* Open terminal/cmd and change directoty to this project folder: `cd /Users/.../javascript-datastructures-algorithms` (Linux/Max) or `cd C:/.../javascript-datastructures-algorithms` -* run `npm install` to install all depencies +* Open terminal/cmd and change directory to this project folder: `cd /Users/.../javascript-datastructures-algorithms` (Linux/Max) or `cd C:/.../javascript-datastructures-algorithms` +* run `npm install` to install all dependencies * To see the examples, run `http-server html` or `npm run serve`. Open your browser `http:\\localhost:8080` to see the book examples * Or `cd html/chapter01` and run each javascript file with node: `node 02-Variables` @@ -33,4 +70,39 @@ Work in Progress. * Right click on the html file you would like to see the examples, right click and 'Open with Chrome (or any other browser)' +* Or open the `examples/index.html` file to easily navigate through all examples: + +* Demo: [https://javascript-ds-algorithms-book.firebaseapp.com](https://javascript-ds-algorithms-book.firebaseapp.com) + + + Happy Coding! + +## Other editions + +| 1st edition | 2nd edition | 3rd edition | +| ------------- |:-------------:|:-------------:| +| ![1st edition](https://images-na.ssl-images-amazon.com/images/I/51xXGv7QlBL._SX403_BO1,204,203,200_.jpg) | ![2nd edition](https://images-na.ssl-images-amazon.com/images/I/51PWJ%2BoKc2L._SX403_BO1,204,203,200_.jpg) | ![3rd edition](https://images-na.ssl-images-amazon.com/images/I/41oSXp3VztL._SX404_BO1,204,203,200_.jpg) | +| [Book link](http://amzn.to/1Y1OWPx)| [Book link](http://amzn.to/1TSkcA1)| [Book link](http://a.co/cbMlYmJ)| + +Book link - first edition: + - [Packt](https://www.packtpub.com/application-development/learning-javascript-data-structures-and-algorithms) + - [Amazon](http://amzn.to/1Y1OWPx) + - [Chinese version](http://www.ituring.com.cn/book/1613) + - [Korean version](http://www.acornpub.co.kr/book/javascript-data-structure) + +Book link - second edition: + - [Packt](https://www.packtpub.com/web-development/learning-javascript-data-structures-and-algorithms-second-edition) + - [Amazon](http://amzn.to/1TSkcA1) + - [Chinese version](http://www.ituring.com.cn/book/2029) + - [Brazilian Portuguese version](https://novatec.com.br/livros/estruturas-de-dados-algoritmos-em-javascript/) + + Book link - third edition: + - [Packt](https://www.packtpub.com/web-development/learning-javascript-data-structures-and-algorithms-third-edition) + - [Amazon](http://a.co/cbMlYmJ) + - [Chinese version](http://www.ituring.com.cn/book/2653) + - [Brazilian Portuguese version](https://novatec.com.br/livros/estruturas-de-dados-algoritmos-em-javascript-2ed/) + +### Found an issue or have a question? + +Please create an [Issue](https://github.com/loiane/javascript-datastructures-algorithms/issues) or [Pull Request](https://github.com/loiane/javascript-datastructures-algorithms/pulls) diff --git a/examples/PacktDataStructuresAlgorithms.min.js b/examples/PacktDataStructuresAlgorithms.min.js index 2977a273..b7d4c0c6 100644 --- a/examples/PacktDataStructuresAlgorithms.min.js +++ b/examples/PacktDataStructuresAlgorithms.min.js @@ -1 +1,2 @@ -!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define("PacktDataStructuresAlgorithms",[],e):"object"==typeof exports?exports.PacktDataStructuresAlgorithms=e():t.PacktDataStructuresAlgorithms=e()}(this,function(){return function(t){function e(r){if(n[r])return n[r].exports;var 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this.head = node;\n } else {\n const previous = this.getElementAt(index - 1);\n node.next = previous.next;\n previous.next = node;\n }\n this.count++;\n return true;\n }\n return false;\n }\n removeAt(index) {\n if (index >= 0 && index < this.count) {\n let current = this.head;\n if (index === 0) {\n this.head = current.next;\n } else {\n const previous = this.getElementAt(index - 1);\n current = previous.next;\n previous.next = current.next;\n }\n this.count--;\n return current.element;\n }\n return undefined;\n }\n remove(element) {\n const index = this.indexOf(element);\n return this.removeAt(index);\n }\n indexOf(element) {\n let current = this.head;\n for (let i = 0; i < this.size() && current != null; i++) {\n if (this.equalsFn(element, current.element)) {\n return i;\n }\n current = current.next;\n }\n return -1;\n }\n isEmpty() {\n return this.size() === 0;\n }\n size() {\n return this.count;\n }\n getHead() {\n return this.head;\n }\n clear() {\n this.head = undefined;\n 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{\n const { length } = array;\n let temp;\n for (let i = 1; i < length; i++) {\n let j = i;\n temp = array[i];\n // console.log('to be inserted ' + temp);\n while (j > 0 && compareFn(array[j - 1], temp) === Compare.BIGGER_THAN) {\n // console.log('shift ' + array[j - 1]);\n array[j] = array[j - 1];\n j--;\n }\n // console.log('insert ' + temp);\n array[j] = temp;\n }\n return array;\n};\n","export class Node {\n constructor(key) {\n this.key = key;\n this.left = undefined;\n this.right = undefined;\n }\n toString() {\n return `${this.key}`;\n }\n}\n","import { Compare, defaultCompare } from '../util';\nimport { Node } from './models/node';\n\nexport default class BinarySearchTree {\n constructor(compareFn = defaultCompare) {\n this.compareFn = compareFn;\n this.root = undefined;\n }\n insert(key) {\n // special case: first key\n if (this.root == null) {\n this.root = new Node(key);\n } else {\n this.insertNode(this.root, key);\n }\n }\n insertNode(node, key) {\n if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n if (node.left == null) {\n node.left = new Node(key);\n } else {\n this.insertNode(node.left, key);\n }\n } else if (node.right == null) {\n node.right = new Node(key);\n } else {\n this.insertNode(node.right, key);\n }\n }\n getRoot() {\n return this.root;\n }\n search(key) {\n return this.searchNode(this.root, key);\n }\n searchNode(node, key) {\n if (node == null) {\n return false;\n }\n if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n return this.searchNode(node.left, key);\n } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {\n return this.searchNode(node.right, key);\n }\n return true;\n }\n inOrderTraverse(callback) {\n this.inOrderTraverseNode(this.root, callback);\n }\n inOrderTraverseNode(node, callback) {\n if (node != null) {\n this.inOrderTraverseNode(node.left, callback);\n callback(node.key);\n this.inOrderTraverseNode(node.right, callback);\n }\n }\n preOrderTraverse(callback) {\n this.preOrderTraverseNode(this.root, callback);\n }\n preOrderTraverseNode(node, callback) {\n if (node != null) {\n callback(node.key);\n this.preOrderTraverseNode(node.left, callback);\n this.preOrderTraverseNode(node.right, callback);\n }\n }\n postOrderTraverse(callback) {\n this.postOrderTraverseNode(this.root, callback);\n }\n postOrderTraverseNode(node, callback) {\n if (node != null) {\n this.postOrderTraverseNode(node.left, callback);\n this.postOrderTraverseNode(node.right, callback);\n callback(node.key);\n }\n }\n min() {\n return this.minNode(this.root);\n }\n minNode(node) {\n let current = node;\n while (current != null && current.left != null) {\n current = current.left;\n }\n return current;\n }\n max() {\n return this.maxNode(this.root);\n }\n maxNode(node) {\n let current = node;\n while (current != null && current.right != null) {\n current = current.right;\n }\n return current;\n }\n remove(key) {\n this.root = this.removeNode(this.root, key);\n }\n removeNode(node, key) {\n if (node == null) {\n return undefined;\n }\n if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n node.left = this.removeNode(node.left, key);\n return node;\n } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {\n node.right = this.removeNode(node.right, key);\n return node;\n }\n // key is equal to node.item\n // handle 3 special conditions\n // 1 - a leaf node\n // 2 - a node with only 1 child\n // 3 - a node with 2 children\n // case 1\n if (node.left == null && node.right == null) {\n node = undefined;\n return node;\n }\n // case 2\n if (node.left == null) {\n node = node.right;\n return node;\n } else if (node.right == null) {\n node = node.left;\n return node;\n }\n // case 3\n const aux = this.minNode(node.right);\n node.key = aux.key;\n node.right = this.removeNode(node.right, aux.key);\n return node;\n }\n}\n","import { defaultToString } from '../util';\nimport { ValuePair } from './models/value-pair';\n\nexport default class Dictionary {\n constructor(toStrFn = defaultToString) {\n this.toStrFn = toStrFn;\n this.table = {};\n }\n set(key, value) {\n if (key != null && value != null) {\n const tableKey = this.toStrFn(key);\n this.table[tableKey] = new ValuePair(key, value);\n return true;\n }\n return false;\n }\n get(key) {\n const valuePair = this.table[this.toStrFn(key)];\n return valuePair == null ? undefined : valuePair.value;\n }\n hasKey(key) {\n return this.table[this.toStrFn(key)] != null;\n }\n remove(key) {\n if (this.hasKey(key)) {\n delete this.table[this.toStrFn(key)];\n return true;\n }\n return false;\n }\n values() {\n return this.keyValues().map(valuePair => valuePair.value);\n }\n keys() {\n return this.keyValues().map(valuePair => valuePair.key);\n }\n keyValues() {\n return Object.values(this.table);\n }\n forEach(callbackFn) {\n const valuePairs = this.keyValues();\n for (let i = 0; i < valuePairs.length; i++) {\n const result = callbackFn(valuePairs[i].key, valuePairs[i].value);\n if (result === false) {\n break;\n }\n }\n }\n isEmpty() {\n return this.size() === 0;\n }\n size() {\n return Object.keys(this.table).length;\n }\n clear() {\n this.table = {};\n }\n toString() {\n if (this.isEmpty()) {\n return '';\n }\n const valuePairs = this.keyValues();\n let objString = `${valuePairs[0].toString()}`;\n for (let i = 1; i < valuePairs.length; i++) {\n objString = `${objString},${valuePairs[i].toString()}`;\n }\n return objString;\n }\n}\n","import { defaultEquals } from '../util';\nimport LinkedList from './linked-list';\nimport { DoublyNode } from './models/linked-list-models';\n\nexport default class DoublyLinkedList extends LinkedList {\n constructor(equalsFn = defaultEquals) {\n super(equalsFn);\n this.tail = undefined;\n }\n push(element) {\n const node = new DoublyNode(element);\n if (this.head == null) {\n this.head = node;\n this.tail = node; // NEW\n } else {\n // attach to the tail node // NEW\n this.tail.next = node;\n node.prev = this.tail;\n this.tail = node;\n }\n this.count++;\n }\n insert(element, index) {\n if (index >= 0 && index <= this.count) {\n const node = new DoublyNode(element);\n let current = this.head;\n if (index === 0) {\n if (this.head == null) { // NEW\n this.head = node;\n this.tail = node; // NEW\n } else {\n node.next = this.head;\n this.head.prev = node; // NEW\n this.head = node;\n }\n } else if (index === this.count) { // last item NEW\n current = this.tail;\n current.next = node;\n node.prev = current;\n this.tail = node;\n } else {\n const previous = this.getElementAt(index - 1);\n current = previous.next;\n node.next = current;\n previous.next = node;\n current.prev = node; // NEW\n node.prev = previous; // NEW\n }\n this.count++;\n return true;\n }\n return false;\n }\n removeAt(index) {\n if (index >= 0 && index < this.count) {\n let current = this.head;\n if (index === 0) {\n this.head = this.head.next;\n // if there is only one item, then we update tail as well //NEW\n if (this.count === 1) {\n // {2}\n this.tail = undefined;\n } else {\n this.head.prev = undefined;\n }\n } else if (index === this.count - 1) {\n // last item //NEW\n current = this.tail;\n this.tail = current.prev;\n this.tail.next = undefined;\n } else {\n current = this.getElementAt(index);\n const previous = current.prev;\n // link previous with current's next - skip it to remove\n previous.next = current.next;\n current.next.prev = previous; // NEW\n }\n this.count--;\n return current.element;\n }\n return undefined;\n }\n indexOf(element) {\n let current = this.head;\n let index = 0;\n while (current != null) {\n if (this.equalsFn(element, current.element)) {\n return index;\n }\n index++;\n current = current.next;\n }\n return -1;\n }\n getHead() {\n return this.head;\n }\n getTail() {\n return this.tail;\n }\n clear() {\n super.clear();\n this.tail = undefined;\n }\n toString() {\n if (this.head == null) {\n return '';\n }\n let objString = `${this.head.element}`;\n let current = this.head.next;\n while (current != null) {\n objString = `${objString},${current.element}`;\n current = current.next;\n }\n return objString;\n }\n inverseToString() {\n if (this.tail == null) {\n return '';\n }\n let objString = `${this.tail.element}`;\n let previous = this.tail.prev;\n while (previous != null) {\n objString = `${objString},${previous.element}`;\n previous = previous.prev;\n }\n return objString;\n }\n}\n","// @ts-check\n\nexport default class Deque {\n constructor() {\n this.count = 0;\n this.lowestCount = 0;\n this.items = {};\n }\n\n addFront(element) {\n if (this.isEmpty()) {\n this.addBack(element);\n } else if (this.lowestCount > 0) {\n this.lowestCount--;\n this.items[this.lowestCount] = element;\n } else {\n for (let i = this.count; i > 0; i--) {\n this.items[i] = this.items[i - 1];\n }\n this.count++;\n this.items[0] = element;\n }\n }\n\n addBack(element) {\n this.items[this.count] = element;\n this.count++;\n }\n\n removeFront() {\n if (this.isEmpty()) {\n return undefined;\n }\n const result = this.items[this.lowestCount];\n delete this.items[this.lowestCount];\n this.lowestCount++;\n return result;\n }\n\n removeBack() {\n if (this.isEmpty()) {\n return undefined;\n }\n this.count--;\n const result = this.items[this.count];\n delete this.items[this.count];\n return result;\n }\n\n peekFront() {\n if (this.isEmpty()) {\n return undefined;\n }\n return this.items[this.lowestCount];\n }\n\n peekBack() {\n if (this.isEmpty()) {\n return undefined;\n }\n return this.items[this.count - 1];\n }\n\n isEmpty() {\n return this.size() === 0;\n }\n\n clear() {\n this.items = {};\n this.count = 0;\n this.lowestCount = 0;\n }\n\n size() {\n return this.count - this.lowestCount;\n }\n\n toString() {\n if (this.isEmpty()) {\n return '';\n }\n let objString = `${this.items[this.lowestCount]}`;\n for (let i = this.lowestCount + 1; i < this.count; i++) {\n objString = `${objString},${this.items[i]}`;\n }\n return objString;\n }\n}\n","export const floydWarshall = graph => {\n const dist = [];\n const { length } = graph;\n for (let i = 0; i < length; i++) {\n dist[i] = [];\n for (let j = 0; j < length; j++) {\n if (i === j) {\n dist[i][j] = 0;\n } else if (!isFinite(graph[i][j])) {\n dist[i][j] = Infinity;\n } else {\n dist[i][j] = graph[i][j];\n }\n }\n }\n for (let k = 0; k < length; k++) {\n for (let i = 0; i < length; i++) {\n for (let j = 0; j < length; j++) {\n if (dist[i][k] + dist[k][j] < dist[i][j]) {\n dist[i][j] = dist[i][k] + dist[k][j];\n }\n }\n }\n }\n return dist;\n};\n","const UNASSIGNED = 0;\n\nfunction usedInRow(matrix, row, num) {\n for (let col = 0; col < matrix.length; col++) {\n if (matrix[row][col] === num) {\n return true;\n }\n }\n return false;\n}\n\nfunction usedInCol(matrix, col, num) {\n for (let row = 0; row < matrix.length; row++) {\n if (matrix[row][col] === num) {\n return true;\n }\n }\n return false;\n}\n\nfunction usedInBox(matrix, boxStartRow, boxStartCol, num) {\n for (let row = 0; row < 3; row++) {\n for (let col = 0; col < 3; col++) {\n if (matrix[row + boxStartRow][col + boxStartCol] === num) {\n return true;\n }\n }\n }\n return false;\n}\n\nfunction isSafe(matrix, row, col, num) {\n return (\n !usedInRow(matrix, row, num) &&\n !usedInCol(matrix, col, num) &&\n !usedInBox(matrix, row - (row % 3), col - (col % 3), num)\n );\n}\nfunction solveSudoku(matrix) {\n let row = 0;\n let col = 0;\n let checkBlankSpaces = false;\n\n for (row = 0; row < matrix.length; row++) {\n for (col = 0; col < matrix[row].length; col++) {\n if (matrix[row][col] === UNASSIGNED) {\n checkBlankSpaces = true;\n break;\n }\n }\n if (checkBlankSpaces === true) {\n break;\n }\n }\n if (checkBlankSpaces === false) {\n return true;\n }\n\n for (let num = 1; num <= 9; num++) {\n if (isSafe(matrix, row, col, num)) {\n matrix[row][col] = num;\n if (solveSudoku(matrix)) {\n return true;\n }\n matrix[row][col] = UNASSIGNED;\n }\n }\n return false;\n}\n\nexport function sudokuSolver(matrix) {\n if (solveSudoku(matrix) === true) {\n return matrix;\n }\n return 'NO SOLUTION EXISTS!';\n}\n","function isSafe(maze, x, y) {\n const n = maze.length;\n if (x >= 0 && y >= 0 && x < n && y < n && maze[x][y] !== 0) {\n return true;\n }\n return false;\n}\n\nfunction findPath(maze, x, y, solution) {\n const n = maze.length;\n if (x === n - 1 && y === n - 1) {\n solution[x][y] = 1;\n return true;\n }\n if (isSafe(maze, x, y) === true) {\n solution[x][y] = 1;\n if (findPath(maze, x + 1, y, solution)) {\n return true;\n }\n if (findPath(maze, x, y + 1, solution)) {\n return true;\n }\n solution[x][y] = 0;\n return false;\n }\n return false;\n}\n\nexport function ratInAMaze(maze) {\n const solution = [];\n for (let i = 0; i < maze.length; i++) {\n solution[i] = [];\n for (let j = 0; j < maze[i].length; j++) {\n solution[i][j] = 0;\n }\n }\n if (findPath(maze, 0, 0, solution) === true) {\n return solution;\n }\n return 'NO PATH FOUND';\n}\n","export function matrixChainOrder(p, i = 1, j = p.length - 1) {\n if (i === j) {\n return 0;\n }\n let min = Number.MAX_SAFE_INTEGER;\n for (let k = i; k < j; k++) {\n const count =\n matrixChainOrder(p, i, k) + matrixChainOrder(p, k + 1, j) + ((p[i - 1] * p[k]) * p[j]);\n if (count < min) {\n min = count;\n }\n }\n return min;\n}\n","function printOptimalParenthesis(s, i, j) {\n if (i === j) {\n // console.log('A[' + i + ']');\n } else {\n // console.log('(');\n printOptimalParenthesis(s, i, s[i][j]);\n printOptimalParenthesis(s, s[i][j] + 1, j);\n // console.log(')');\n }\n}\n\nexport function matrixChainOrder(p) {\n const n = p.length;\n const m = [];\n const s = [];\n for (let i = 1; i <= n; i++) {\n m[i] = [];\n m[i][i] = 0;\n }\n for (let i = 0; i <= n; i++) {\n // to help printing the optimal solution\n s[i] = []; // auxiliary\n for (let j = 0; j <= n; j++) {\n s[i][j] = 0;\n }\n }\n for (let l = 2; l < n; l++) {\n for (let i = 1; i <= (n - l) + 1; i++) {\n const j = (i + l) - 1;\n m[i][j] = Number.MAX_SAFE_INTEGER;\n for (let k = i; k <= j - 1; k++) {\n // q = cost/scalar multiplications\n const q = m[i][k] + m[k + 1][j] + ((p[i - 1] * p[k]) * p[j]);\n if (q < m[i][j]) {\n m[i][j] = q;\n s[i][j] = k; // s[i,j] = Second auxiliary table that stores k\n }\n }\n }\n }\n // console.log(m);\n // console.log(s);\n printOptimalParenthesis(s, 1, n - 1);\n return m[1][n - 1];\n}\n\n","export function lcs(wordX, wordY, m = wordX.length, n = wordY.length) {\n if (m === 0 || n === 0) {\n return 0;\n }\n if (wordX[m - 1] === wordY[n - 1]) {\n return 1 + lcs(wordX, wordY, m - 1, n - 1);\n }\n const a = lcs(wordX, wordY, m, n - 1);\n const b = lcs(wordX, wordY, m - 1, n);\n return a > b ? a : b;\n}\n","function printSolution(solution, wordX, m, n) {\n let a = m;\n let b = n;\n let x = solution[a][b];\n let answer = '';\n while (x !== '0') {\n if (solution[a][b] === 'diagonal') {\n answer = wordX[a - 1] + answer;\n a--;\n b--;\n } else if (solution[a][b] === 'left') {\n b--;\n } else if (solution[a][b] === 'top') {\n a--;\n }\n x = solution[a][b];\n }\n return answer;\n}\nexport function lcs(wordX, wordY) {\n const m = wordX.length;\n const n = wordY.length;\n const l = [];\n const solution = [];\n for (let i = 0; i <= m; i++) {\n l[i] = [];\n solution[i] = [];\n for (let j = 0; j <= n; j++) {\n l[i][j] = 0;\n solution[i][j] = '0';\n }\n }\n for (let i = 0; i <= m; i++) {\n for (let j = 0; j <= n; j++) {\n if (i === 0 || j === 0) {\n l[i][j] = 0;\n } else if (wordX[i - 1] === wordY[j - 1]) {\n l[i][j] = l[i - 1][j - 1] + 1;\n solution[i][j] = 'diagonal';\n } else {\n const a = l[i - 1][j];\n const b = l[i][j - 1];\n l[i][j] = a > b ? a : b; // max(a,b)\n solution[i][j] = l[i][j] === l[i - 1][j] ? 'top' : 'left';\n }\n }\n // console.log(l[i].join());\n // console.log(solution[i].join());\n }\n return printSolution(solution, wordX, m, n);\n}\n","export function lcs(wordX, wordY) {\n const m = wordX.length;\n const n = wordY.length;\n const l = [];\n for (let i = 0; i <= m; i++) {\n l[i] = [];\n for (let j = 0; j <= n; j++) {\n l[i][j] = 0;\n }\n }\n for (let i = 0; i <= m; i++) {\n for (let j = 0; j <= n; j++) {\n if (i === 0 || j === 0) {\n l[i][j] = 0;\n } else if (wordX[i - 1] === wordY[j - 1]) {\n l[i][j] = l[i - 1][j - 1] + 1;\n } else {\n const a = l[i - 1][j];\n const b = l[i][j - 1];\n l[i][j] = a > b ? a : b; // max(a,b)\n }\n }\n // console.log(l[i].join());\n }\n return l[m][n];\n}\n","export function knapSack(capacity, weights, values) {\n const n = values.length;\n let load = 0;\n let val = 0;\n for (let i = 0; i < n && load < capacity; i++) {\n if (weights[i] <= capacity - load) {\n val += values[i];\n load += weights[i];\n // console.log('using item ' + (i + 1) + ' for the solution');\n } else {\n const r = (capacity - load) / weights[i];\n val += r * values[i];\n load += weights[i];\n // console.log('using ratio of ' + r + ' for item ' + (i + 1) + ' for the solution');\n }\n }\n return val;\n}\n","export function knapSack(capacity, weights, values, n) {\n if (n === 0 || capacity === 0) {\n return 0;\n }\n if (weights[n - 1] > capacity) {\n return knapSack(capacity, weights, values, n - 1);\n }\n const a = values[n - 1] + knapSack(capacity - weights[n - 1], weights, values, n - 1);\n const b = knapSack(capacity, weights, values, n - 1);\n return a > b ? a : b;\n}\n","function findValues(n, capacity, kS) {\n let i = n;\n let k = capacity;\n // console.log('Items that are part of the solution:');\n while (i > 0 && k > 0) {\n if (kS[i][k] !== kS[i - 1][k]) {\n // console.log(\n // item ' + i + ' can be part of solution w,v: ' + weights[i - 1] + ',' + values[i - 1]\n // );\n i--;\n k -= kS[i][k];\n } else {\n i--;\n }\n }\n}\n\nexport function knapSack(capacity, weights, values, n) {\n const kS = [];\n for (let i = 0; i <= n; i++) {\n kS[i] = [];\n }\n for (let i = 0; i <= n; i++) {\n for (let w = 0; w <= capacity; w++) {\n if (i === 0 || w === 0) {\n kS[i][w] = 0;\n } else if (weights[i - 1] <= w) {\n const a = values[i - 1] + kS[i - 1][w - weights[i - 1]];\n const b = kS[i - 1][w];\n kS[i][w] = a > b ? a : b; // max(a,b)\n // console.log(a + ' can be part of the solution');\n } else {\n kS[i][w] = kS[i - 1][w];\n }\n }\n // console.log(kS[i].join());\n }\n // extra algorithm to find the items that are part of the solution\n findValues(n, capacity, kS);\n return kS[n][capacity];\n}\n","export function minCoinChange(coins, amount) {\n const change = [];\n let total = 0;\n for (let i = coins.length; i >= 0; i--) {\n const coin = coins[i];\n while (total + coin <= amount) {\n change.push(coin);\n total += coin;\n }\n }\n return change;\n}\n","export function minCoinChange(coins, amount) {\n const cache = [];\n\n const makeChange = (value) => {\n if (!value) {\n return [];\n }\n if (cache[value]) {\n return cache[value];\n }\n let min = [];\n let newMin;\n let newAmount;\n for (let i = 0; i < coins.length; i++) {\n const coin = coins[i];\n newAmount = value - coin;\n if (newAmount >= 0) {\n newMin = makeChange(newAmount);\n }\n if (\n newAmount >= 0 &&\n (newMin.length < min.length - 1 || !min.length) &&\n (newMin.length || !newAmount)\n ) {\n min = [coin].concat(newMin);\n // console.log('new Min ' + min + ' for ' + amount);\n }\n }\n return (cache[value] = min);\n };\n return makeChange(amount);\n}\n","import { Compare, defaultCompare, DOES_NOT_EXIST } from '../../util';\nimport { quickSort } from '../sorting/quicksort';\n\nfunction binarySearchRecursive(array, value, low, high, compareFn = defaultCompare) {\n if (low <= high) {\n const mid = Math.floor((low + high) / 2);\n const element = array[mid];\n if (compareFn(element, value) === Compare.LESS_THAN) {\n return binarySearchRecursive(array, value, mid + 1, high, compareFn);\n }\n if (compareFn(element, value) === Compare.BIGGER_THAN) {\n return binarySearchRecursive(array, value, low, mid - 1, compareFn);\n }\n return mid;\n }\n return DOES_NOT_EXIST;\n}\n\nexport function binarySearch(array, value, compareFn = defaultCompare) {\n const sortedArray = quickSort(array);\n const low = 0;\n const high = sortedArray.length - 1;\n return binarySearchRecursive(array, value, low, high, compareFn);\n}\n","import { defaultEquals, DOES_NOT_EXIST } from '../../util';\n\nexport function sequentialSearch(array, value, equalsFn = defaultEquals) {\n for (let i = 0; i < array.length; i++) {\n if (equalsFn(value, array[i])) {\n return i;\n }\n }\n return DOES_NOT_EXIST;\n}\n","import {\n biggerEquals,\n Compare,\n defaultCompare,\n defaultEquals,\n defaultDiff,\n DOES_NOT_EXIST,\n lesserEquals\n} from '../../util';\n\nexport function interpolationSearch(\n array,\n value,\n compareFn = defaultCompare,\n equalsFn = defaultEquals,\n diffFn = defaultDiff\n) {\n const { length } = array;\n let low = 0;\n let high = length - 1;\n let position = -1;\n let delta = -1;\n while (\n low <= high &&\n biggerEquals(value, array[low], compareFn) &&\n lesserEquals(value, array[high], compareFn)\n ) {\n delta = diffFn(value, array[low]) / diffFn(array[high], array[low]);\n position = low + Math.floor((high - low) * delta);\n if (equalsFn(array[position], value)) {\n return position;\n }\n if (compareFn(array[position], value) === Compare.LESS_THAN) {\n low = position + 1;\n } else {\n high = position - 1;\n }\n }\n return DOES_NOT_EXIST;\n}\n","import { Compare, defaultCompare, DOES_NOT_EXIST } from '../../util';\nimport { quickSort } from '../sorting/quicksort';\n\nexport function binarySearch(array, value, compareFn = defaultCompare) {\n const sortedArray = quickSort(array);\n let low = 0;\n let high = sortedArray.length - 1;\n while (low <= high) {\n const mid = Math.floor((low + high) / 2);\n const element = sortedArray[mid];\n // console.log('mid element is ' + element);\n if (compareFn(element, value) === Compare.LESS_THAN) {\n low = mid + 1;\n // console.log('low is ' + low);\n } else if (compareFn(element, value) === Compare.BIGGER_THAN) {\n high = mid - 1;\n // console.log('high is ' + high);\n } else {\n // console.log('found it');\n return mid;\n }\n }\n return DOES_NOT_EXIST;\n}\n","import { Compare, defaultCompare } from '../../util';\n\nexport function shellSort(array, compareFn = defaultCompare) {\n let increment = array.length / 2;\n while (increment > 0) {\n for (let i = increment; i < array.length; i++) {\n let j = i;\n const temp = array[i];\n while (j >= increment && compareFn(array[j - increment], temp) === Compare.BIGGER_THAN) {\n array[j] = array[j - increment];\n j -= increment;\n }\n array[j] = temp;\n }\n if (increment === 2) {\n increment = 1;\n } else {\n increment = Math.floor((increment * 5) / 11);\n }\n }\n return array;\n}\n","import { Compare, defaultCompare, swap } from '../../util';\n\nexport const selectionSort = (array, compareFn = defaultCompare) => {\n const { length } = array;\n let indexMin;\n for (let i = 0; i < length - 1; i++) {\n indexMin = i;\n // console.log('index ' + array[i]);\n for (let j = i; j < length; j++) {\n if (compareFn(array[indexMin], array[j]) === Compare.BIGGER_THAN) {\n // console.log('new index min ' + array[j]);\n indexMin = j;\n }\n }\n if (i !== indexMin) {\n // console.log('swap ' + array[i] + ' with ' + array[indexMin]);\n swap(array, i, indexMin);\n }\n }\n return array;\n};\n","import { findMaxValue, findMinValue } from '../search/min-max-search';\n\nconst getBucketIndex = (value, minValue, significantDigit, radixBase) =>\n Math.floor(((value - minValue) / significantDigit) % radixBase);\n\nconst countingSortForRadix = (array, radixBase, significantDigit, minValue) => {\n let bucketsIndex;\n const buckets = [];\n const aux = [];\n for (let i = 0; i < radixBase; i++) {\n buckets[i] = 0;\n }\n for (let i = 0; i < array.length; i++) {\n bucketsIndex = getBucketIndex(array[i], minValue, significantDigit, radixBase);\n buckets[bucketsIndex]++;\n }\n for (let i = 1; i < radixBase; i++) {\n buckets[i] += buckets[i - 1];\n }\n for (let i = array.length - 1; i >= 0; i--) {\n bucketsIndex = getBucketIndex(array[i], minValue, significantDigit, radixBase);\n aux[--buckets[bucketsIndex]] = array[i];\n }\n for (let i = 0; i < array.length; i++) {\n array[i] = aux[i];\n }\n return array;\n};\nexport function radixSort(array, radixBase = 10) {\n if (array.length < 2) {\n return array;\n }\n const minValue = findMinValue(array);\n const maxValue = findMaxValue(array);\n // Perform counting sort for each significant digit, starting at 1\n let significantDigit = 1;\n while ((maxValue - minValue) / significantDigit >= 1) {\n // console.log('radix sort for digit ' + significantDigit);\n array = countingSortForRadix(array, radixBase, significantDigit, minValue);\n // console.log(array.join());\n significantDigit *= radixBase;\n }\n return array;\n}\n","import { Compare, defaultCompare } from '../../util';\n\nfunction merge(left, right, compareFn) {\n let i = 0;\n let j = 0;\n const result = [];\n while (i < left.length && j < right.length) {\n result.push(compareFn(left[i], right[j]) === Compare.LESS_THAN ? left[i++] : right[j++]);\n }\n return result.concat(i < left.length ? left.slice(i) : right.slice(j));\n}\nexport function mergeSort(array, compareFn = defaultCompare) {\n if (array.length > 1) {\n const { length } = array;\n const middle = Math.floor(length / 2);\n const left = mergeSort(array.slice(0, middle), compareFn);\n const right = mergeSort(array.slice(middle, length), compareFn);\n array = merge(left, right, compareFn);\n }\n return array;\n}\n","import { findMaxValue } from '../search/min-max-search';\n\nexport function countingSort(array) {\n if (array.length < 2) {\n return array;\n }\n const maxValue = findMaxValue(array);\n let sortedIndex = 0;\n const counts = new Array(maxValue + 1);\n array.forEach(element => {\n if (!counts[element]) {\n counts[element] = 0;\n }\n counts[element]++;\n });\n // console.log('Frequencies: ' + counts.join());\n counts.forEach((element, i) => {\n while (element > 0) {\n array[sortedIndex++] = i;\n element--;\n }\n });\n return array;\n}\n","import { insertionSort } from './insertion-sort';\n\nfunction createBuckets(array, bucketSize) {\n let minValue = array[0];\n let maxValue = array[0];\n for (let i = 1; i < array.length; i++) {\n if (array[i] < minValue) {\n minValue = array[i];\n } else if (array[i] > maxValue) {\n maxValue = array[i];\n }\n }\n const bucketCount = Math.floor((maxValue - minValue) / bucketSize) + 1;\n const buckets = [];\n for (let i = 0; i < bucketCount; i++) {\n buckets[i] = [];\n }\n for (let i = 0; i < array.length; i++) {\n buckets[Math.floor((array[i] - minValue) / bucketSize)].push(array[i]);\n }\n return buckets;\n}\nfunction sortBuckets(buckets) {\n const sortedArray = [];\n for (let i = 0; i < buckets.length; i++) {\n if (buckets[i] != null) {\n insertionSort(buckets[i]);\n sortedArray.push(...buckets[i]);\n }\n }\n return sortedArray;\n}\nexport function bucketSort(array, bucketSize = 5) {\n if (array.length < 2) {\n return array;\n }\n const buckets = createBuckets(array, bucketSize);\n return sortBuckets(buckets);\n}\n","import { Compare, defaultCompare, swap } from '../../util';\n\nexport function modifiedBubbleSort(array, compareFn = defaultCompare) {\n const { length } = array;\n for (let i = 0; i < length; i++) {\n // console.log('--- ');\n for (let j = 0; j < length - 1 - i; j++) {\n // console.log('compare ' + array[j] + ' with ' + array[j + 1]);\n if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) {\n // console.log('swap ' + array[j] + ' with ' + array[j + 1]);\n swap(array, j, j + 1);\n }\n }\n }\n return array;\n}\n","import { Compare, defaultCompare, swap } from '../../util';\n\nexport function bubbleSort(array, compareFn = defaultCompare) {\n const { length } = array;\n for (let i = 0; i < length; i++) {\n // console.log('--- ');\n for (let j = 0; j < length - 1; j++) {\n // console.log('compare ' + array[j] + ' with ' + array[j + 1]);\n if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) {\n // console.log('swap ' + array[j] + ' with ' + array[j + 1]);\n swap(array, j, j + 1);\n }\n }\n }\n return array;\n}\n","import { swap } from '../../util';\n\nexport function shuffle(array) {\n let currentIndex = array.length;\n while (currentIndex !== 0) {\n const randomIndex = Math.floor(Math.random() * currentIndex);\n currentIndex--;\n swap(array, currentIndex, randomIndex);\n }\n return array;\n}\n","const INF = Number.MAX_SAFE_INTEGER;\nconst find = (i, parent) => {\n while (parent[i]) {\n i = parent[i]; // eslint-disable-line prefer-destructuring\n }\n return i;\n};\nconst union = (i, j, parent) => {\n if (i !== j) {\n parent[j] = i;\n return true;\n }\n return false;\n};\nconst initializeCost = graph => {\n const cost = [];\n const { length } = graph;\n for (let i = 0; i < length; i++) {\n cost[i] = [];\n for (let j = 0; j < length; j++) {\n if (graph[i][j] === 0) {\n cost[i][j] = INF;\n } else {\n cost[i][j] = graph[i][j];\n }\n }\n }\n return cost;\n};\nexport const kruskal = graph => {\n const { length } = graph;\n const parent = [];\n let ne = 0;\n let a;\n let b;\n let u;\n let v;\n const cost = initializeCost(graph);\n while (ne < length - 1) {\n for (let i = 0, min = INF; i < length; i++) {\n for (let j = 0; j < length; j++) {\n if (cost[i][j] < min) {\n min = cost[i][j];\n a = u = i;\n b = v = j;\n }\n }\n }\n u = find(u, parent);\n v = find(v, parent);\n if (union(u, v, parent)) {\n ne++;\n }\n cost[a][b] = cost[b][a] = INF;\n }\n return parent;\n};\n","const INF = Number.MAX_SAFE_INTEGER;\nconst minKey = (graph, key, visited) => {\n // Initialize min value\n let min = INF;\n let minIndex = 0;\n for (let v = 0; v < graph.length; v++) {\n if (visited[v] === false && key[v] < min) {\n min = key[v];\n minIndex = v;\n }\n }\n return minIndex;\n};\nexport const prim = graph => {\n const parent = [];\n const key = [];\n const visited = [];\n const { length } = graph;\n for (let i = 0; i < length; i++) {\n key[i] = INF;\n visited[i] = false;\n }\n key[0] = 0;\n parent[0] = -1;\n for (let i = 0; i < length - 1; i++) {\n const u = minKey(graph, key, visited);\n visited[u] = true;\n for (let v = 0; v < length; v++) {\n if (graph[u][v] && !visited[v] && graph[u][v] < key[v]) {\n parent[v] = u;\n key[v] = graph[u][v];\n }\n }\n }\n return parent;\n};\n","const INF = Number.MAX_SAFE_INTEGER;\nconst minDistance = (dist, visited) => {\n let min = INF;\n let minIndex = -1;\n for (let v = 0; v < dist.length; v++) {\n if (visited[v] === false && dist[v] <= min) {\n min = dist[v];\n minIndex = v;\n }\n }\n return minIndex;\n};\nexport const dijkstra = (graph, src) => {\n const dist = [];\n const visited = [];\n const { length } = graph;\n for (let i = 0; i < length; i++) {\n dist[i] = INF;\n visited[i] = false;\n }\n dist[src] = 0;\n for (let i = 0; i < length - 1; i++) {\n const u = minDistance(dist, visited);\n visited[u] = true;\n for (let v = 0; v < length; v++) {\n if (!visited[v] && graph[u][v] !== 0 && dist[u] !== INF && dist[u] + graph[u][v] < dist[v]) {\n dist[v] = dist[u] + graph[u][v];\n }\n }\n }\n return dist;\n};\n","// import Graph from '../../data-structures/graph';\n\nconst Colors = {\n WHITE: 0,\n GREY: 1,\n BLACK: 2\n};\n\nconst initializeColor = vertices => {\n const color = {};\n for (let i = 0; i < vertices.length; i++) {\n color[vertices[i]] = Colors.WHITE;\n }\n return color;\n};\n\nconst depthFirstSearchVisit = (u, color, adjList, callback) => {\n color[u] = Colors.GREY;\n if (callback) {\n callback(u);\n }\n // console.log('Discovered ' + u);\n const neighbors = adjList.get(u);\n for (let i = 0; i < neighbors.length; i++) {\n const w = neighbors[i];\n if (color[w] === Colors.WHITE) {\n depthFirstSearchVisit(w, color, adjList, callback);\n }\n }\n color[u] = Colors.BLACK;\n // console.log('explored ' + u);\n};\n\nexport const depthFirstSearch = (graph, callback) => {\n const vertices = graph.getVertices();\n const adjList = graph.getAdjList();\n const color = initializeColor(vertices);\n\n for (let i = 0; i < vertices.length; i++) {\n if (color[vertices[i]] === Colors.WHITE) {\n depthFirstSearchVisit(vertices[i], color, adjList, callback);\n }\n }\n};\n\nconst DFSVisit = (u, color, d, f, p, time, adjList) => {\n // console.log('discovered ' + u);\n color[u] = Colors.GREY;\n d[u] = ++time.count;\n const neighbors = adjList.get(u);\n for (let i = 0; i < neighbors.length; i++) {\n const w = neighbors[i];\n if (color[w] === Colors.WHITE) {\n p[w] = u;\n DFSVisit(w, color, d, f, p, time, adjList);\n }\n }\n color[u] = Colors.BLACK;\n f[u] = ++time.count;\n // console.log('explored ' + u);\n};\n\nexport const DFS = graph => {\n const vertices = graph.getVertices();\n const adjList = graph.getAdjList();\n const color = initializeColor(vertices);\n const d = {};\n const f = {};\n const p = {};\n const time = { count: 0 };\n for (let i = 0; i < vertices.length; i++) {\n f[vertices[i]] = 0;\n d[vertices[i]] = 0;\n p[vertices[i]] = null;\n }\n for (let i = 0; i < vertices.length; i++) {\n if (color[vertices[i]] === Colors.WHITE) {\n DFSVisit(vertices[i], color, d, f, p, time, adjList);\n }\n }\n return {\n discovery: d,\n finished: f,\n predecessors: p\n };\n};\n","import Queue from '../../data-structures/queue';\n\nconst Colors = {\n WHITE: 0,\n GREY: 1,\n BLACK: 2\n};\n\nconst initializeColor = vertices => {\n const color = {};\n for (let i = 0; i < vertices.length; i++) {\n color[vertices[i]] = Colors.WHITE;\n }\n return color;\n};\n\nexport const breadthFirstSearch = (graph, startVertex, callback) => {\n const vertices = graph.getVertices();\n const adjList = graph.getAdjList();\n const color = initializeColor(vertices);\n const queue = new Queue();\n\n queue.enqueue(startVertex);\n\n while (!queue.isEmpty()) {\n const u = queue.dequeue();\n const neighbors = adjList.get(u);\n color[u] = Colors.GREY;\n for (let i = 0; i < neighbors.length; i++) {\n const w = neighbors[i];\n if (color[w] === Colors.WHITE) {\n color[w] = Colors.GREY;\n queue.enqueue(w);\n }\n }\n color[u] = Colors.BLACK;\n if (callback) {\n callback(u);\n }\n }\n};\n\nexport const BFS = (graph, startVertex) => {\n const vertices = graph.getVertices();\n const adjList = graph.getAdjList();\n const color = initializeColor(vertices);\n const queue = new Queue();\n const distances = {};\n const predecessors = {};\n queue.enqueue(startVertex);\n for (let i = 0; i < vertices.length; i++) {\n distances[vertices[i]] = 0;\n predecessors[vertices[i]] = null;\n }\n while (!queue.isEmpty()) {\n const u = queue.dequeue();\n const neighbors = adjList.get(u);\n color[u] = Colors.GREY;\n for (let i = 0; i < neighbors.length; i++) {\n const w = neighbors[i];\n if (color[w] === Colors.WHITE) {\n color[w] = Colors.GREY;\n distances[w] = distances[u] + 1;\n predecessors[w] = u;\n queue.enqueue(w);\n }\n }\n color[u] = Colors.BLACK;\n }\n return {\n distances,\n predecessors\n };\n};\n","import Dictionary from './dictionary';\n\nexport default class Graph {\n constructor(isDirected = false) {\n this.isDirected = isDirected;\n this.vertices = [];\n this.adjList = new Dictionary();\n }\n addVertex(v) {\n if (!this.vertices.includes(v)) {\n this.vertices.push(v);\n this.adjList.set(v, []); // initialize adjacency list with array as well;\n }\n }\n addEdge(a, b) {\n if (!this.adjList.get(a)) {\n this.addVertex(a);\n }\n if (!this.adjList.get(b)) {\n this.addVertex(b);\n }\n this.adjList.get(a).push(b);\n if (this.isDirected !== true) {\n this.adjList.get(b).push(a);\n }\n }\n getVertices() {\n return this.vertices;\n }\n getAdjList() {\n return this.adjList;\n }\n toString() {\n let s = '';\n for (let i = 0; i < this.vertices.length; i++) {\n s += `${this.vertices[i]} -> `;\n const neighbors = this.adjList.get(this.vertices[i]);\n for (let j = 0; j < neighbors.length; j++) {\n s += `${neighbors[j]} `;\n }\n s += '\\n';\n }\n return s;\n }\n}\n","import { defaultCompare, swap } from '../../util';\n\nfunction heapify(array, index, heapSize, compareFn) {\n let largest = index;\n const left = (2 * index) + 1;\n const right = (2 * index) + 2;\n if (left < heapSize && compareFn(array[left], array[index]) > 0) {\n largest = left;\n }\n if (right < heapSize && compareFn(array[right], array[largest]) > 0) {\n largest = right;\n }\n if (largest !== index) {\n swap(array, index, largest);\n heapify(array, largest, heapSize, compareFn);\n }\n}\n\nfunction buildMaxHeap(array, compareFn) {\n for (let i = Math.floor(array.length / 2); i >= 0; i -= 1) {\n heapify(array, i, array.length, compareFn);\n }\n return array;\n}\n\nexport default function heapSort(array, compareFn = defaultCompare) {\n let heapSize = array.length;\n buildMaxHeap(array, compareFn);\n while (heapSize > 1) {\n swap(array, 0, --heapSize);\n heapify(array, 0, heapSize, compareFn);\n }\n return array;\n}\n","import { Compare, defaultCompare, reverseCompare, swap } from '../util';\n\nexport class MinHeap {\n constructor(compareFn = defaultCompare) {\n this.compareFn = compareFn;\n this.heap = [];\n }\n getLeftIndex(index) {\n return (2 * index) + 1;\n }\n getRightIndex(index) {\n return (2 * index) + 2;\n }\n getParentIndex(index) {\n if (index === 0) {\n return undefined;\n }\n return Math.floor((index - 1) / 2);\n }\n size() {\n return this.heap.length;\n }\n isEmpty() {\n return this.size() <= 0;\n }\n clear() {\n this.heap = [];\n }\n findMinimum() {\n return this.isEmpty() ? undefined : this.heap[0];\n }\n insert(value) {\n if (value != null) {\n const index = this.heap.length;\n this.heap.push(value);\n this.siftUp(index);\n return true;\n }\n return false;\n }\n siftDown(index) {\n let element = index;\n const left = this.getLeftIndex(index);\n const right = this.getRightIndex(index);\n const size = this.size();\n if (\n left < size &&\n this.compareFn(this.heap[element], this.heap[left]) === Compare.BIGGER_THAN\n ) {\n element = left;\n }\n if (\n right < size &&\n this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN\n ) {\n element = right;\n }\n if (index !== element) {\n swap(this.heap, index, element);\n this.siftDown(element);\n }\n }\n siftUp(index) {\n let parent = this.getParentIndex(index);\n while (\n index > 0 &&\n this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN\n ) {\n swap(this.heap, parent, index);\n index = parent;\n parent = this.getParentIndex(index);\n }\n }\n extract() {\n if (this.isEmpty()) {\n return undefined;\n }\n if (this.size() === 1) {\n return this.heap.shift();\n }\n const removedValue = this.heap[0];\n this.heap[0] = this.heap.pop();\n this.siftDown(0);\n return removedValue;\n }\n heapify(array) {\n if (array) {\n this.heap = array;\n }\n const maxIndex = Math.floor(this.size() / 2) - 1;\n for (let i = 0; i <= maxIndex; i++) {\n this.siftDown(i);\n }\n return this.heap;\n }\n getAsArray() {\n return this.heap;\n }\n}\nexport class MaxHeap extends MinHeap {\n constructor(compareFn = defaultCompare) {\n super(compareFn);\n this.compareFn = compareFn;\n this.compareFn = reverseCompare(compareFn);\n }\n}\n","import { Compare, defaultCompare } from '../util';\nimport BinarySearchTree from './binary-search-tree';\nimport { Node } from './models/node';\n\nconst BalanceFactor = {\n UNBALANCED_RIGHT: 1,\n SLIGHTLY_UNBALANCED_RIGHT: 2,\n BALANCED: 3,\n SLIGHTLY_UNBALANCED_LEFT: 4,\n UNBALANCED_LEFT: 5\n};\n\nexport default class AVLTree extends BinarySearchTree {\n constructor(compareFn = defaultCompare) {\n super(compareFn);\n this.compareFn = compareFn;\n this.root = null;\n }\n getNodeHeight(node) {\n if (node == null) {\n return -1;\n }\n return Math.max(this.getNodeHeight(node.left), this.getNodeHeight(node.right)) + 1;\n }\n /**\n * Left left case: rotate right\n *\n * b a\n * / \\ / \\\n * a e -> rotationLL(b) -> c b\n * / \\ / \\\n * c d d e\n *\n * @param node Node\n */\n rotationLL(node) {\n const tmp = node.left;\n node.left = tmp.right;\n tmp.right = node;\n return tmp;\n }\n /**\n * Right right case: rotate left\n *\n * a b\n * / \\ / \\\n * c b -> rotationRR(a) -> a e\n * / \\ / \\\n * d e c d\n *\n * @param node Node\n */\n rotationRR(node) {\n const tmp = node.right;\n node.right = tmp.left;\n tmp.left = node;\n return tmp;\n }\n /**\n * Left right case: rotate left then right\n * @param node Node\n */\n rotationLR(node) {\n node.left = this.rotationRR(node.left);\n return this.rotationLL(node);\n }\n /**\n * Right left case: rotate right then left\n * @param node Node\n */\n rotationRL(node) {\n node.right = this.rotationLL(node.right);\n return this.rotationRR(node);\n }\n getBalanceFactor(node) {\n const heightDifference = this.getNodeHeight(node.left) - this.getNodeHeight(node.right);\n switch (heightDifference) {\n case -2:\n return BalanceFactor.UNBALANCED_RIGHT;\n case -1:\n return BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT;\n case 1:\n return BalanceFactor.SLIGHTLY_UNBALANCED_LEFT;\n case 2:\n return BalanceFactor.UNBALANCED_LEFT;\n default:\n return BalanceFactor.BALANCED;\n }\n }\n insert(key) {\n this.root = this.insertNode(this.root, key);\n }\n insertNode(node, key) {\n if (node == null) {\n return new Node(key);\n } else if (this.compareFn(key, node.key) === Compare.LESS_THAN) {\n node.left = this.insertNode(node.left, key);\n } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) {\n node.right = this.insertNode(node.right, key);\n } else {\n return node; // duplicated key\n }\n // verify if tree is balanced\n const balanceFactor = this.getBalanceFactor(node);\n if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) {\n if (this.compareFn(key, node.left.key) === Compare.LESS_THAN) {\n // Left left case\n node = this.rotationLL(node);\n } else {\n // Left right case\n return this.rotationLR(node);\n }\n }\n if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) {\n if (this.compareFn(key, node.right.key) === Compare.BIGGER_THAN) {\n // Right right case\n node = this.rotationRR(node);\n } else {\n // Right left case\n return this.rotationRL(node);\n }\n }\n return node;\n }\n removeNode(node, key) {\n node = super.removeNode(node, key); // {1}\n if (node == null) {\n return node;\n }\n // verify if tree is balanced\n const balanceFactor = this.getBalanceFactor(node);\n if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) {\n // Left left case\n if (\n this.getBalanceFactor(node.left) === BalanceFactor.BALANCED ||\n this.getBalanceFactor(node.left) === BalanceFactor.SLIGHTLY_UNBALANCED_LEFT\n ) {\n return this.rotationLL(node);\n }\n // Left right case\n if (this.getBalanceFactor(node.left) === BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT) {\n return this.rotationLR(node.left);\n }\n }\n if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) {\n // Right right case\n if (\n this.getBalanceFactor(node.right) === BalanceFactor.BALANCED ||\n this.getBalanceFactor(node.right) === BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT\n ) {\n return this.rotationRR(node);\n }\n // Right left case\n if (this.getBalanceFactor(node.right) === BalanceFactor.SLIGHTLY_UNBALANCED_LEFT) {\n return this.rotationRL(node.right);\n }\n }\n return node;\n }\n}\n","export function fibonacci(n) {\n if (n < 1) {\n return 0;\n }\n if (n <= 2) {\n return 1;\n }\n return fibonacci(n - 1) + fibonacci(n - 2);\n}\n\nexport function fibonacciIterative(n) {\n if (n < 1) { return 0; }\n let fibNMinus2 = 0;\n let fibNMinus1 = 1;\n let fibN = n;\n for (let i = 2; i <= n; i++) {\n fibN = fibNMinus1 + fibNMinus2;\n fibNMinus2 = fibNMinus1;\n fibNMinus1 = fibN;\n }\n return fibN;\n}\n\nexport function fibonacciMemoization(n) {\n if (n < 1) { return 0; }\n const memo = [0, 1];\n const fibonacciMem = num => {\n if (memo[num] != null) { return memo[num]; }\n return (memo[num] = fibonacciMem(num - 1) + fibonacciMem(num - 2));\n };\n return fibonacciMem(n);\n}\n","export function factorialIterative(number) {\n if (number < 0) {\n return undefined;\n }\n let total = 1;\n for (let n = number; n > 1; n--) {\n total *= n;\n }\n return total;\n}\n\nexport function factorial(n) {\n if (n < 0) {\n return undefined;\n }\n if (n === 1 || n === 0) {\n return 1;\n }\n return n * factorial(n - 1);\n}\n","import { ValuePair } from './value-pair';\n\nexport class ValuePairLazy extends ValuePair {\n constructor(key, value, isDeleted = false) {\n super(key, value);\n this.key = key;\n this.value = value;\n this.isDeleted = isDeleted;\n }\n}\n","import { defaultToString } from '../util';\nimport { ValuePairLazy } from './models/value-pair-lazy';\n\nexport default class HashTableLinearProbingLazy {\n constructor(toStrFn = defaultToString) {\n this.toStrFn = toStrFn;\n this.table = {};\n }\n loseloseHashCode(key) {\n if (typeof key === 'number') {\n return key;\n }\n const tableKey = this.toStrFn(key);\n let hash = 0;\n for (let i = 0; i < tableKey.length; i++) {\n hash += tableKey.charCodeAt(i);\n }\n return hash % 37;\n }\n hashCode(key) {\n return this.loseloseHashCode(key);\n }\n put(key, value) {\n if (key != null && value != null) {\n const position = this.hashCode(key);\n if (\n this.table[position] == null ||\n (this.table[position] != null && this.table[position].isDeleted)\n ) {\n this.table[position] = new ValuePairLazy(key, value);\n } else {\n let index = position + 1;\n while (this.table[index] != null && !this.table[position].isDeleted) {\n index++;\n }\n this.table[index] = new ValuePairLazy(key, value);\n }\n return true;\n }\n return false;\n }\n get(key) {\n const position = this.hashCode(key);\n if (this.table[position] != null) {\n if (this.table[position].key === key && !this.table[position].isDeleted) {\n return this.table[position].value;\n }\n let index = position + 1;\n while (\n this.table[index] != null &&\n (this.table[index].key !== key || this.table[index].isDeleted)\n ) {\n if (this.table[index].key === key && this.table[index].isDeleted) {\n return undefined;\n }\n index++;\n }\n if (\n this.table[index] != null &&\n this.table[index].key === key &&\n !this.table[index].isDeleted\n ) {\n return this.table[position].value;\n }\n }\n return undefined;\n }\n remove(key) {\n const position = this.hashCode(key);\n if (this.table[position] != null) {\n if (this.table[position].key === key && !this.table[position].isDeleted) {\n this.table[position].isDeleted = true;\n return true;\n }\n let index = position + 1;\n while (\n this.table[index] != null &&\n (this.table[index].key !== key || this.table[index].isDeleted)\n ) {\n index++;\n }\n if (\n this.table[index] != null &&\n this.table[index].key === key &&\n !this.table[index].isDeleted\n ) {\n this.table[index].isDeleted = true;\n return true;\n }\n }\n return false;\n }\n isEmpty() {\n return this.size() === 0;\n }\n size() {\n let count = 0;\n Object.values(this.table).forEach(valuePair => {\n count += valuePair.isDeleted === true ? 0 : 1;\n });\n return count;\n }\n clear() {\n this.table = {};\n }\n getTable() {\n return this.table;\n }\n toString() {\n if (this.isEmpty()) {\n return '';\n }\n const keys = Object.keys(this.table);\n let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n for (let i = 1; i < keys.length; i++) {\n objString = `${objString},{${keys[i]} => ${this.table[\n keys[i]\n ].toString()}}`;\n }\n return objString;\n }\n}\n","import { defaultToString } from '../util';\nimport { ValuePair } from './models/value-pair';\n\nexport default class HashTableLinearProbing {\n constructor(toStrFn = defaultToString) {\n this.toStrFn = toStrFn;\n this.table = {};\n }\n loseloseHashCode(key) {\n if (typeof key === 'number') {\n return key;\n }\n const tableKey = this.toStrFn(key);\n let hash = 0;\n for (let i = 0; i < tableKey.length; i++) {\n hash += tableKey.charCodeAt(i);\n }\n return hash % 37;\n }\n hashCode(key) {\n return this.loseloseHashCode(key);\n }\n put(key, value) {\n if (key != null && value != null) {\n const position = this.hashCode(key);\n if (this.table[position] == null) {\n this.table[position] = new ValuePair(key, value);\n } else {\n let index = position + 1;\n while (this.table[index] != null) {\n index++;\n }\n this.table[index] = new ValuePair(key, value);\n }\n return true;\n }\n return false;\n }\n get(key) {\n const position = this.hashCode(key);\n if (this.table[position] != null) {\n if (this.table[position].key === key) {\n return this.table[position].value;\n }\n let index = position + 1;\n while (this.table[index] != null && this.table[index].key !== key) {\n index++;\n }\n if (this.table[index] != null && this.table[index].key === key) {\n return this.table[position].value;\n }\n }\n return undefined;\n }\n remove(key) {\n const position = this.hashCode(key);\n if (this.table[position] != null) {\n if (this.table[position].key === key) {\n delete this.table[position];\n this.verifyRemoveSideEffect(key, position);\n return true;\n }\n let index = position + 1;\n while (this.table[index] != null && this.table[index].key !== key) {\n index++;\n }\n if (this.table[index] != null && this.table[index].key === key) {\n delete this.table[index];\n this.verifyRemoveSideEffect(key, index);\n return true;\n }\n }\n return false;\n }\n verifyRemoveSideEffect(key, removedPosition) {\n const hash = this.hashCode(key);\n let index = removedPosition + 1;\n while (this.table[index] != null) {\n const posHash = this.hashCode(this.table[index].key);\n if (posHash <= hash || posHash <= removedPosition) {\n this.table[removedPosition] = this.table[index];\n delete this.table[index];\n removedPosition = index;\n }\n index++;\n }\n }\n isEmpty() {\n return this.size() === 0;\n }\n size() {\n return Object.keys(this.table).length;\n }\n clear() {\n this.table = {};\n }\n getTable() {\n return this.table;\n }\n toString() {\n if (this.isEmpty()) {\n return '';\n }\n const keys = Object.keys(this.table);\n let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n for (let i = 1; i < keys.length; i++) {\n objString = `${objString},{${keys[i]} => ${this.table[\n keys[i]\n ].toString()}}`;\n }\n return objString;\n }\n}\n","import { defaultToString } from '../util';\nimport LinkedList from './linked-list';\nimport { ValuePair } from './models/value-pair';\n\nexport default class HashTableSeparateChaining {\n constructor(toStrFn = defaultToString) {\n this.toStrFn = toStrFn;\n this.table = {};\n }\n loseloseHashCode(key) {\n if (typeof key === 'number') {\n return key;\n }\n const tableKey = this.toStrFn(key);\n let hash = 0;\n for (let i = 0; i < tableKey.length; i++) {\n hash += tableKey.charCodeAt(i);\n }\n return hash % 37;\n }\n hashCode(key) {\n return this.loseloseHashCode(key);\n }\n put(key, value) {\n if (key != null && value != null) {\n const position = this.hashCode(key);\n if (this.table[position] == null) {\n this.table[position] = new LinkedList();\n }\n this.table[position].push(new ValuePair(key, value));\n return true;\n }\n return false;\n }\n get(key) {\n const position = this.hashCode(key);\n const linkedList = this.table[position];\n if (linkedList != null && !linkedList.isEmpty()) {\n let current = linkedList.getHead();\n while (current != null) {\n if (current.element.key === key) {\n return current.element.value;\n }\n current = current.next;\n }\n }\n return undefined;\n }\n remove(key) {\n const position = this.hashCode(key);\n const linkedList = this.table[position];\n if (linkedList != null && !linkedList.isEmpty()) {\n let current = linkedList.getHead();\n while (current != null) {\n if (current.element.key === key) {\n linkedList.remove(current.element);\n if (linkedList.isEmpty()) {\n delete this.table[position];\n }\n return true;\n }\n current = current.next;\n }\n }\n return false;\n }\n isEmpty() {\n return this.size() === 0;\n }\n size() {\n let count = 0;\n Object.values(this.table).forEach(linkedList => {\n count += linkedList.size();\n });\n return count;\n }\n clear() {\n this.table = {};\n }\n getTable() {\n return this.table;\n }\n toString() {\n if (this.isEmpty()) {\n return '';\n }\n const keys = Object.keys(this.table);\n let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n for (let i = 1; i < keys.length; i++) {\n objString = `${objString},{${keys[i]} => ${this.table[\n keys[i]\n ].toString()}}`;\n }\n return objString;\n }\n}\n","import { defaultToString } from '../util';\nimport { ValuePair } from './models/value-pair';\n\nexport default class HashTable {\n constructor(toStrFn = defaultToString) {\n this.toStrFn = toStrFn;\n this.table = {};\n }\n loseloseHashCode(key) {\n if (typeof key === 'number') {\n return key;\n }\n const tableKey = this.toStrFn(key);\n let hash = 0;\n for (let i = 0; i < tableKey.length; i++) {\n hash += tableKey.charCodeAt(i);\n }\n return hash % 37;\n }\n /* djb2HashCode(key) {\n const tableKey = this.toStrFn(key);\n let hash = 5381;\n for (let i = 0; i < tableKey.length; i++) {\n hash = (hash * 33) + tableKey.charCodeAt(i);\n }\n return hash % 1013;\n } */\n hashCode(key) {\n return this.loseloseHashCode(key);\n }\n put(key, value) {\n if (key != null && value != null) {\n const position = this.hashCode(key);\n this.table[position] = new ValuePair(key, value);\n return true;\n }\n return false;\n }\n get(key) {\n const valuePair = this.table[this.hashCode(key)];\n return valuePair == null ? undefined : valuePair.value;\n }\n remove(key) {\n const hash = this.hashCode(key);\n const valuePair = this.table[hash];\n if (valuePair != null) {\n delete this.table[hash];\n return true;\n }\n return false;\n }\n getTable() {\n return this.table;\n }\n isEmpty() {\n return this.size() === 0;\n }\n size() {\n return Object.keys(this.table).length;\n }\n clear() {\n this.table = {};\n }\n toString() {\n if (this.isEmpty()) {\n return '';\n }\n const keys = Object.keys(this.table);\n let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`;\n for (let i = 1; i < keys.length; i++) {\n objString = `${objString},{${keys[i]} => ${this.table[keys[i]].toString()}}`;\n }\n return objString;\n }\n}\n","export default class Set {\n constructor() {\n this.items = {};\n }\n add(element) {\n if (!this.has(element)) {\n this.items[element] = element;\n return true;\n }\n return false;\n }\n delete(element) {\n if (this.has(element)) {\n delete this.items[element];\n return true;\n }\n return false;\n }\n has(element) {\n return Object.prototype.hasOwnProperty.call(this.items, element);\n }\n values() {\n return Object.values(this.items);\n }\n union(otherSet) {\n const unionSet = new Set();\n this.values().forEach(value => unionSet.add(value));\n otherSet.values().forEach(value => unionSet.add(value));\n return unionSet;\n }\n intersection(otherSet) {\n const intersectionSet = new Set();\n const values = this.values();\n const otherValues = otherSet.values();\n let biggerSet = values;\n let smallerSet = otherValues;\n if (otherValues.length - values.length > 0) {\n biggerSet = otherValues;\n smallerSet = values;\n }\n smallerSet.forEach(value => {\n if (biggerSet.includes(value)) {\n intersectionSet.add(value);\n }\n });\n return intersectionSet;\n }\n difference(otherSet) {\n const differenceSet = new Set();\n this.values().forEach(value => {\n if (!otherSet.has(value)) {\n differenceSet.add(value);\n }\n });\n return differenceSet;\n }\n isSubsetOf(otherSet) {\n if (this.size() > otherSet.size()) {\n return false;\n }\n let isSubset = true;\n this.values().every(value => {\n if (!otherSet.has(value)) {\n isSubset = false;\n return false;\n }\n return true;\n });\n return isSubset;\n }\n isEmpty() {\n return this.size() === 0;\n }\n size() {\n return Object.keys(this.items).length;\n }\n clear() {\n this.items = {};\n }\n toString() {\n if (this.isEmpty()) {\n return '';\n }\n const values = this.values();\n let objString = `${values[0]}`;\n for (let i = 1; i < values.length; i++) {\n objString = `${objString},${values[i].toString()}`;\n }\n return objString;\n }\n}\n","import DoublyLinkedList from './doubly-linked-list';\n\nexport default class StackLinkedList {\n constructor() {\n this.items = new DoublyLinkedList();\n }\n push(element) {\n this.items.push(element);\n }\n pop() {\n if (this.isEmpty()) {\n return undefined;\n }\n const result = this.items.removeAt(this.size() - 1);\n return result;\n }\n peek() {\n if (this.isEmpty()) {\n return undefined;\n }\n return this.items.getElementAt(this.size() - 1).element;\n }\n isEmpty() {\n return this.items.isEmpty();\n }\n size() {\n return this.items.size();\n }\n clear() {\n this.items.clear();\n }\n toString() {\n return this.items.toString();\n }\n}\n","import { Compare, defaultCompare, defaultEquals } from '../util';\nimport LinkedList from './linked-list';\n\nexport default class SortedLinkedList extends LinkedList {\n constructor(equalsFn = defaultEquals, compareFn = defaultCompare) {\n super(equalsFn);\n this.equalsFn = equalsFn;\n this.compareFn = compareFn;\n }\n push(element) {\n if (this.isEmpty()) {\n super.push(element);\n } else {\n const index = this.getIndexNextSortedElement(element);\n super.insert(element, index);\n }\n }\n insert(element, index = 0) {\n if (this.isEmpty()) {\n return super.insert(element, index === 0 ? index : 0);\n }\n const pos = this.getIndexNextSortedElement(element);\n return super.insert(element, pos);\n }\n getIndexNextSortedElement(element) {\n let current = this.head;\n let i = 0;\n for (; i < this.size() && current; i++) {\n const comp = this.compareFn(element, current.element);\n if (comp === Compare.LESS_THAN) {\n return i;\n }\n current = current.next;\n }\n return i;\n }\n}\n","import { defaultEquals } from '../util';\nimport LinkedList from './linked-list';\nimport { Node } from './models/linked-list-models';\n\nexport default class CircularLinkedList extends LinkedList {\n constructor(equalsFn = defaultEquals) {\n super(equalsFn);\n }\n push(element) {\n const node = new Node(element);\n let current;\n if (this.head == null) {\n this.head = node;\n } else {\n current = this.getElementAt(this.size() - 1);\n current.next = node;\n }\n // set node.next to head - to have circular list\n node.next = this.head;\n this.count++;\n }\n insert(element, index) {\n if (index >= 0 && index <= this.count) {\n const node = new Node(element);\n let current = this.head;\n if (index === 0) {\n if (this.head == null) {\n // if no node in list\n this.head = node;\n node.next = this.head;\n } else {\n node.next = current;\n current = this.getElementAt(this.size());\n // update last element\n this.head = node;\n current.next = this.head;\n }\n } else {\n const previous = this.getElementAt(index - 1);\n node.next = previous.next;\n previous.next = node;\n }\n this.count++;\n return true;\n }\n return false;\n }\n removeAt(index) {\n if (index >= 0 && index < this.count) {\n let current = this.head;\n if (index === 0) {\n if (this.size() === 1) {\n this.head = undefined;\n } else {\n const removed = this.head;\n current = this.getElementAt(this.size() - 1);\n this.head = this.head.next;\n current.next = this.head;\n current = removed;\n }\n } else {\n // no need to update last element for circular list\n const previous = this.getElementAt(index - 1);\n current = previous.next;\n previous.next = current.next;\n }\n this.count--;\n return current.element;\n }\n return undefined;\n }\n}\n","import Deque from '../data-structures/deque';\n\nexport function palindromeChecker(aString) {\n if (\n aString === undefined ||\n aString === null ||\n (aString !== null && aString.length === 0)\n ) {\n return false;\n }\n const deque = new Deque();\n const lowerString = aString.toLocaleLowerCase().split(' ').join('');\n let firstChar;\n let lastChar;\n\n for (let i = 0; i < lowerString.length; i++) {\n deque.addBack(lowerString.charAt(i));\n }\n\n while (deque.size() > 1) {\n firstChar = deque.removeFront();\n lastChar = deque.removeBack();\n if (firstChar !== lastChar) {\n return false;\n }\n }\n\n return true;\n}\n","import Queue from '../data-structures/queue';\n\nexport function hotPotato(elementsList, num) {\n const queue = new Queue();\n const elimitatedList = [];\n\n for (let i = 0; i < elementsList.length; i++) {\n queue.enqueue(elementsList[i]);\n }\n\n while (queue.size() > 1) {\n for (let i = 0; i < num; i++) {\n queue.enqueue(queue.dequeue());\n }\n elimitatedList.push(queue.dequeue());\n }\n\n return {\n eliminated: elimitatedList,\n winner: queue.dequeue()\n };\n}\n","// @ts-check\nimport Stack from '../data-structures/stack';\n\nexport function parenthesesChecker(symbols) {\n const stack = new Stack();\n const opens = '([{';\n const closers = ')]}';\n let balanced = true;\n let index = 0;\n let symbol;\n let top;\n\n while (index < symbols.length && balanced) {\n symbol = symbols[index];\n if (opens.indexOf(symbol) >= 0) {\n stack.push(symbol);\n } else if (stack.isEmpty()) {\n balanced = false;\n } else {\n top = stack.pop();\n if (!(opens.indexOf(top) === closers.indexOf(symbol))) {\n balanced = false;\n }\n }\n index++;\n }\n return balanced && stack.isEmpty();\n}\n","// @ts-check\nimport Stack from '../data-structures/stack';\n\nexport function decimalToBinary(decNumber) {\n const remStack = new Stack();\n let number = decNumber;\n let rem;\n let binaryString = '';\n\n while (number > 0) {\n rem = Math.floor(number % 2);\n remStack.push(rem);\n number = Math.floor(number / 2);\n }\n\n while (!remStack.isEmpty()) {\n binaryString += remStack.pop().toString();\n }\n\n return binaryString;\n}\n\nexport function baseConverter(decNumber, base) {\n const remStack = new Stack();\n const digits = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';\n let number = decNumber;\n let rem;\n let baseString = '';\n\n if (!(base >= 2 && base <= 36)) {\n return '';\n }\n\n while (number > 0) {\n rem = Math.floor(number % base);\n remStack.push(rem);\n number = Math.floor(number / base);\n }\n\n while (!remStack.isEmpty()) {\n baseString += digits[remStack.pop()];\n }\n\n return baseString;\n}\n","// @ts-check\nimport Stack from '../data-structures/stack';\n\nfunction towerOfHanoi(plates, source, helper, dest, sourceName, helperName, destName, moves = []) {\n if (plates <= 0) {\n return moves;\n }\n if (plates === 1) {\n dest.push(source.pop());\n const move = {};\n move[sourceName] = source.toString();\n move[helperName] = helper.toString();\n move[destName] = dest.toString();\n moves.push(move);\n } else {\n towerOfHanoi(plates - 1, source, dest, helper, sourceName, destName, helperName, moves);\n dest.push(source.pop());\n const move = {};\n move[sourceName] = source.toString();\n move[helperName] = helper.toString();\n move[destName] = dest.toString();\n moves.push(move);\n towerOfHanoi(plates - 1, helper, source, dest, helperName, sourceName, destName, moves);\n }\n return moves;\n}\n\nexport function hanoiStack(plates) {\n const source = new Stack();\n const dest = new Stack();\n const helper = new Stack();\n\n for (let i = plates; i > 0; i--) {\n source.push(i);\n }\n\n return towerOfHanoi(plates, source, helper, dest, 'source', 'helper', 'dest');\n}\n\nexport function hanoi(plates, source, helper, dest, moves = []) {\n if (plates <= 0) {\n return moves;\n }\n if (plates === 1) {\n moves.push([source, dest]);\n } else {\n hanoi(plates - 1, source, dest, helper, moves);\n moves.push([source, dest]);\n hanoi(plates - 1, helper, source, dest, moves);\n }\n return moves;\n}\n","// @ts-check\n\nexport default class StackArray {\n constructor() {\n this.items = [];\n }\n push(element) {\n this.items.push(element);\n }\n\n pop() {\n return this.items.pop();\n }\n\n peek() {\n return this.items[this.items.length - 1];\n }\n\n isEmpty() {\n return this.items.length === 0;\n }\n\n size() {\n return this.items.length;\n }\n\n clear() {\n this.items = [];\n }\n\n toArray() {\n return this.items;\n }\n\n toString() {\n return this.items.toString();\n }\n}\n","import * as _util from './util';\n\n// chapters 05 and 07\nexport const util = _util;\n\n// chapter 03\nexport { default as StackArray } from './data-structures/stack-array';\nexport { default as Stack } from './data-structures/stack';\nexport { hanoi } from './others/hanoi';\nexport { hanoiStack } from './others/hanoi';\nexport { baseConverter } from './others/base-converter';\nexport { decimalToBinary } from './others/base-converter';\nexport { parenthesesChecker } from './others/balanced-symbols';\n\n// chapter 04\nexport { default as Queue } from './data-structures/queue';\nexport { default as Deque } from './data-structures/deque';\nexport { hotPotato } from './others/hot-potato';\nexport { palindromeChecker } from './others/palindrome-checker';\n\n// chapter 05\nexport { default as LinkedList } from './data-structures/linked-list';\nexport { default as DoublyLinkedList } from './data-structures/doubly-linked-list';\nexport { default as CircularLinkedList } from './data-structures/circular-linked-list';\nexport { default as SortedLinkedList } from './data-structures/sorted-linked-list';\nexport { default as StackLinkedList } from './data-structures/stack-linked-list';\n\n// chapter 06\nexport { default as Set } from './data-structures/set';\n\n// chapter 07\nexport { default as Dictionary } from './data-structures/dictionary';\nexport { default as HashTable } from './data-structures/hash-table';\nexport { default as HashTableSeparateChaining } from './data-structures/hash-table-separate-chaining';\nexport { default as HashTableLinearProbing } from './data-structures/hash-table-linear-probing';\nexport { default as HashTableLinearProbingLazy } from './data-structures/hash-table-linear-probing-lazy';\n\n// chapter 08\nexport { default as factorialIterative } from './others/factorial';\nexport { default as factorial } from './others/factorial';\nexport { default as fibonacci } from './others/fibonacci';\nexport { default as fibonacciIterative } from './others/fibonacci';\nexport { default as fibonacciMemoization } from './others/fibonacci';\n\n// chapter 09\nexport { default as BinarySearchTree } from './data-structures/binary-search-tree';\nexport { default as AVLTree } from './data-structures/avl-tree';\n\n// chapter 10\nexport { MinHeap } from './data-structures/heap';\nexport { MaxHeap } from './data-structures/heap';\nexport { default as heapSort } from './algorithms/sorting/heap-sort';\n\n// chapter 11\nexport { default as Graph } from './data-structures/graph';\nexport { breadthFirstSearch } from './algorithms/graph/breadth-first-search';\nexport { BFS } from './algorithms/graph/breadth-first-search';\nexport { depthFirstSearch } from './algorithms/graph/depth-first-search';\nexport { DFS } from './algorithms/graph/depth-first-search';\nexport { dijkstra } from './algorithms/graph/dijkstra';\nexport { floydWarshall } from './algorithms/graph/floyd-warshall';\nexport { prim } from './algorithms/graph/prim';\nexport { kruskal } from './algorithms/graph/kruskal';\n\n// chapter 12\nexport { shuffle } from './algorithms/shuffle/fisher–yates';\n\nexport { bubbleSort } from './algorithms/sorting/bubble-sort';\nexport { modifiedBubbleSort } from './algorithms/sorting/bubble-sort-improved';\nexport { bucketSort } from './algorithms/sorting/bucket-sort';\nexport { countingSort } from './algorithms/sorting/counting-sort';\nexport { insertionSort } from './algorithms/sorting/insertion-sort';\nexport { mergeSort } from './algorithms/sorting/merge-sort';\nexport { quickSort } from './algorithms/sorting/quicksort';\nexport { radixSort } from './algorithms/sorting/radix-sort';\nexport { selectionSort } from './algorithms/sorting/selection-sort';\nexport { shellSort } from './algorithms/sorting/shell-sort';\n\nexport { binarySearch } from './algorithms/search/binary-search';\nexport { interpolationSearch } from './algorithms/search/interpolation-search';\nexport { sequentialSearch } from './algorithms/search/sequential-search';\nexport { findMaxValue } from './algorithms/search/min-max-search';\nexport { findMinValue } from './algorithms/search/min-max-search';\n\n// chapter 14\nexport { binarySearch as binarySearchRecursive } from './algorithms/search/binary-search-recursive';\nexport { minCoinChange } from './algorithms/dynamic-programing/min-coin-change';\nexport { minCoinChange as minCoinChangeGreedy } from './algorithms/greedy/min-coin-change';\nexport { knapSack } from './algorithms/dynamic-programing/knapsack';\nexport { knapSack as knapSackRecursive } from './algorithms/dynamic-programing/knapsack-recursive';\nexport { knapSack as knapSackGreedy } from './algorithms/greedy/knapsack';\nexport { lcs } from './algorithms/dynamic-programing/longest-common-subsequence';\nexport { lcs as lcsPrint } from './algorithms/dynamic-programing/longest-common-subsequence-print';\nexport { lcs as lcsRecursive } from './algorithms/greedy/longest-common-subsequence';\nexport { matrixChainOrder } from './algorithms/dynamic-programing/matrix-chain-multiplication';\nexport { matrixChainOrder as matrixChainOrderGreedy } from './algorithms/greedy/matrix-chain-multiplication';\nexport { ratInAMaze } from './algorithms/backtracking/rat-in-maze';\nexport { sudokuSolver } from './algorithms/backtracking/sudoku-solver';\n"],"sourceRoot":""} \ No newline at end of file diff --git a/examples/chapter01/01-HelloWorld.html b/examples/chapter01_02/01-HelloWorld.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/01-HelloWorld.html rename to examples/chapter01_02/01-HelloWorld.html diff --git a/examples/chapter01/01-HelloWorld.js b/examples/chapter01_02/01-HelloWorld.js similarity index 100% rename from examples/chapter01/01-HelloWorld.js rename to examples/chapter01_02/01-HelloWorld.js diff --git a/examples/chapter01/02-Variables.html b/examples/chapter01_02/02-Variables.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/02-Variables.html rename to examples/chapter01_02/02-Variables.html diff --git a/examples/chapter01/02-Variables.js b/examples/chapter01_02/02-Variables.js similarity index 100% rename from examples/chapter01/02-Variables.js rename to examples/chapter01_02/02-Variables.js diff --git a/examples/chapter01/03-Operators.html b/examples/chapter01_02/03-Operators.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/03-Operators.html rename to examples/chapter01_02/03-Operators.html diff --git a/examples/chapter01/03-Operators.js b/examples/chapter01_02/03-Operators.js old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/03-Operators.js rename to examples/chapter01_02/03-Operators.js diff --git a/examples/chapter01/04-TruthyFalsy.html b/examples/chapter01_02/04-TruthyFalsy.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/04-TruthyFalsy.html rename to examples/chapter01_02/04-TruthyFalsy.html diff --git a/examples/chapter01/04-TruthyFalsy.js b/examples/chapter01_02/04-TruthyFalsy.js similarity index 88% rename from examples/chapter01/04-TruthyFalsy.js rename to examples/chapter01_02/04-TruthyFalsy.js index 96264875..0090ee74 100644 --- a/examples/chapter01/04-TruthyFalsy.js +++ b/examples/chapter01_02/04-TruthyFalsy.js @@ -10,6 +10,7 @@ testTruthy(false); // false testTruthy(new Boolean(false)); // true (object is always true) testTruthy(''); // false +testTruthy('a'); // true testTruthy('Packt'); // true testTruthy(new String('')); // true (object is always true) @@ -23,4 +24,4 @@ testTruthy({}); // true (object is always true) var obj = { name: 'John' }; testTruthy(obj); // true testTruthy(obj.name); // true -testTruthy(obj.age); // age (property does not exist) +testTruthy(obj.age); // false (property age does not exist) diff --git a/examples/chapter01/05-EqualsOperators.html b/examples/chapter01_02/05-EqualsOperators.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/05-EqualsOperators.html rename to examples/chapter01_02/05-EqualsOperators.html diff --git a/examples/chapter01/05-EqualsOperators.js b/examples/chapter01_02/05-EqualsOperators.js similarity index 100% rename from examples/chapter01/05-EqualsOperators.js rename to examples/chapter01_02/05-EqualsOperators.js diff --git a/examples/chapter01/06-ConditionalStatements.html b/examples/chapter01_02/06-ConditionalStatements.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/06-ConditionalStatements.html rename to examples/chapter01_02/06-ConditionalStatements.html diff --git a/examples/chapter01/06-ConditionalStatements.js b/examples/chapter01_02/06-ConditionalStatements.js similarity index 100% rename from examples/chapter01/06-ConditionalStatements.js rename to examples/chapter01_02/06-ConditionalStatements.js diff --git a/examples/chapter01/07-Loops.html b/examples/chapter01_02/07-Loops.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/07-Loops.html rename to examples/chapter01_02/07-Loops.html diff --git a/examples/chapter01/07-Loops.js b/examples/chapter01_02/07-Loops.js old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/07-Loops.js rename to examples/chapter01_02/07-Loops.js diff --git a/examples/chapter01/08-Functions.html b/examples/chapter01_02/08-Functions.html old mode 100644 new mode 100755 similarity index 100% rename from examples/chapter01/08-Functions.html rename to examples/chapter01_02/08-Functions.html diff --git a/examples/chapter01/08-Functions.js b/examples/chapter01_02/08-Functions.js similarity index 100% rename from examples/chapter01/08-Functions.js rename to examples/chapter01_02/08-Functions.js diff --git a/examples/chapter01/09-ObjectOrientedJS.html b/examples/chapter01_02/09-ObjectOrientedJS.html similarity index 100% rename from examples/chapter01/09-ObjectOrientedJS.html rename to examples/chapter01_02/09-ObjectOrientedJS.html diff --git a/examples/chapter01/09-ObjectOrientedJS.js b/examples/chapter01_02/09-ObjectOrientedJS.js similarity index 100% rename from examples/chapter01/09-ObjectOrientedJS.js rename to examples/chapter01_02/09-ObjectOrientedJS.js diff --git a/examples/chapter01/10-ES2015-ES6-letconst.html b/examples/chapter01_02/10-ES2015-ES6-letconst.html similarity index 100% rename from examples/chapter01/10-ES2015-ES6-letconst.html rename to examples/chapter01_02/10-ES2015-ES6-letconst.html diff --git a/examples/chapter01/10-ES2015-ES6-letconst.js b/examples/chapter01_02/10-ES2015-ES6-letconst.js similarity index 100% rename from examples/chapter01/10-ES2015-ES6-letconst.js rename to examples/chapter01_02/10-ES2015-ES6-letconst.js diff --git 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b/examples/chapter01_02/lib/17-ES2015-ES6-Modules.js similarity index 100% rename from examples/chapter01/lib/17-ES2015-ES6-Modules.js rename to examples/chapter01_02/lib/17-ES2015-ES6-Modules.js diff --git a/examples/chapter01/typescript/hello-world.js b/examples/chapter01_02/typescript/hello-world.js similarity index 100% rename from examples/chapter01/typescript/hello-world.js rename to examples/chapter01_02/typescript/hello-world.js diff --git a/examples/chapter01/typescript/hello-world.ts b/examples/chapter01_02/typescript/hello-world.ts similarity index 100% rename from examples/chapter01/typescript/hello-world.ts rename to examples/chapter01_02/typescript/hello-world.ts diff --git a/examples/chapter02/01-Introduction.html b/examples/chapter03/01-Introduction.html similarity index 100% rename from examples/chapter02/01-Introduction.html rename to examples/chapter03/01-Introduction.html diff --git a/examples/chapter02/01-Introduction.js b/examples/chapter03/01-Introduction.js similarity index 100% rename from examples/chapter02/01-Introduction.js rename to examples/chapter03/01-Introduction.js diff --git a/examples/chapter03/01-Stack.html b/examples/chapter03/01-Stack.html deleted file mode 100755 index c322ded8..00000000 --- a/examples/chapter03/01-Stack.html +++ /dev/null @@ -1,12 +0,0 @@ - - - - - - - - - - - - diff --git a/examples/chapter02/02-CreatingAndInitialingArrays.html b/examples/chapter03/02-CreatingAndInitialingArrays.html similarity index 100% rename from examples/chapter02/02-CreatingAndInitialingArrays.html rename to examples/chapter03/02-CreatingAndInitialingArrays.html diff --git a/examples/chapter02/02-CreatingAndInitialingArrays.js b/examples/chapter03/02-CreatingAndInitialingArrays.js similarity index 100% rename from examples/chapter02/02-CreatingAndInitialingArrays.js rename to examples/chapter03/02-CreatingAndInitialingArrays.js diff --git a/examples/chapter02/03-AddingRemovingElements.html b/examples/chapter03/03-AddingRemovingElements.html similarity index 100% rename from examples/chapter02/03-AddingRemovingElements.html rename to examples/chapter03/03-AddingRemovingElements.html diff --git a/examples/chapter02/03-AddingRemovingElements.js b/examples/chapter03/03-AddingRemovingElements.js similarity index 100% rename from examples/chapter02/03-AddingRemovingElements.js rename to examples/chapter03/03-AddingRemovingElements.js diff --git a/examples/chapter03/04-TowerOfHanoi.js b/examples/chapter03/04-TowerOfHanoi.js deleted file mode 100755 index e611aef6..00000000 --- a/examples/chapter03/04-TowerOfHanoi.js +++ /dev/null @@ -1,6 +0,0 @@ -const hanoiStack = PacktDataStructuresAlgorithms.hanoiStack; -const hanoi = PacktDataStructuresAlgorithms.hanoi; - -console.log(hanoiStack(3)); - -console.log(hanoi(3, 'source', 'helper', 'dest')); diff --git a/examples/chapter02/04-TwoDimensionalMultiDimensional.html b/examples/chapter03/04-TwoDimensionalMultiDimensional.html similarity index 100% rename from examples/chapter02/04-TwoDimensionalMultiDimensional.html rename to examples/chapter03/04-TwoDimensionalMultiDimensional.html diff --git a/examples/chapter02/04-TwoDimensionalMultiDimensional.js b/examples/chapter03/04-TwoDimensionalMultiDimensional.js similarity index 100% rename from examples/chapter02/04-TwoDimensionalMultiDimensional.js rename to examples/chapter03/04-TwoDimensionalMultiDimensional.js diff --git a/examples/chapter02/05-ArrayMethods.html b/examples/chapter03/05-ArrayMethods.html similarity index 100% rename from examples/chapter02/05-ArrayMethods.html rename to examples/chapter03/05-ArrayMethods.html diff --git a/examples/chapter02/05-ArrayMethods.js b/examples/chapter03/05-ArrayMethods.js similarity index 100% rename from examples/chapter02/05-ArrayMethods.js rename to examples/chapter03/05-ArrayMethods.js diff --git a/examples/chapter02/06-ES2015Methods.html b/examples/chapter03/06-ES2015Methods.html similarity index 100% rename from examples/chapter02/06-ES2015Methods.html rename to examples/chapter03/06-ES2015Methods.html diff --git a/examples/chapter02/06-ES2015Methods.js b/examples/chapter03/06-ES2015Methods.js similarity index 100% rename from examples/chapter02/06-ES2015Methods.js rename to examples/chapter03/06-ES2015Methods.js diff --git a/examples/chapter02/07-Sorting.html b/examples/chapter03/07-Sorting.html similarity index 100% rename from examples/chapter02/07-Sorting.html rename to examples/chapter03/07-Sorting.html diff --git a/examples/chapter02/07-Sorting.js b/examples/chapter03/07-Sorting.js similarity index 100% rename from examples/chapter02/07-Sorting.js rename to examples/chapter03/07-Sorting.js diff --git a/examples/chapter02/08-Searching.html b/examples/chapter03/08-Searching.html similarity index 100% rename from examples/chapter02/08-Searching.html rename to examples/chapter03/08-Searching.html diff --git a/examples/chapter02/08-Searching.js b/examples/chapter03/08-Searching.js similarity index 100% rename from examples/chapter02/08-Searching.js rename to examples/chapter03/08-Searching.js diff --git a/examples/chapter02/09-TypedArrays.html b/examples/chapter03/09-TypedArrays.html similarity index 100% rename from examples/chapter02/09-TypedArrays.html rename to examples/chapter03/09-TypedArrays.html diff --git a/examples/chapter02/09-TypedArrays.js b/examples/chapter03/09-TypedArrays.js similarity index 100% rename from examples/chapter02/09-TypedArrays.js rename to examples/chapter03/09-TypedArrays.js diff --git a/examples/chapter02/10-ArraysAndTypeScript.ts b/examples/chapter03/10-ArraysAndTypeScript.ts similarity index 100% rename from examples/chapter02/10-ArraysAndTypeScript.ts rename to examples/chapter03/10-ArraysAndTypeScript.ts diff --git a/examples/chapter04/01-Stack.html b/examples/chapter04/01-Stack.html new file mode 100755 index 00000000..3025a012 --- /dev/null +++ b/examples/chapter04/01-Stack.html @@ -0,0 +1,13 @@ + + + + + + + + + + + + diff --git a/examples/chapter03/01-Stack.js b/examples/chapter04/01-Stack.js similarity index 88% rename from examples/chapter03/01-Stack.js rename to examples/chapter04/01-Stack.js index 972793b2..d3994b08 100755 --- a/examples/chapter03/01-Stack.js +++ b/examples/chapter04/01-Stack.js @@ -1,7 +1,8 @@ -import Stack from './../../src/js/data-structures/stack.js'; // ES2015 modules +// import Stack from './../../src/js/data-structures/stack.js'; // ES2015 modules // import StackArray from './../../src/js/data-structures/stack-array.js'; // ES2015 modules // const Stack = require('../../dist/js/data-structures/stack'); // for node // const Stack = stack; // older browsers - remove from html script import: type="module" +const { Stack } = PacktDataStructuresAlgorithms; const stack = new Stack(); // new StackArray(); diff --git a/examples/chapter03/01-StackSymbol.js b/examples/chapter04/01-StackSymbol.js similarity index 100% rename from examples/chapter03/01-StackSymbol.js rename to examples/chapter04/01-StackSymbol.js diff --git a/examples/chapter03/01-StackWeakMap.js b/examples/chapter04/01-StackWeakMap.js similarity index 100% rename from examples/chapter03/01-StackWeakMap.js rename to examples/chapter04/01-StackWeakMap.js diff --git a/examples/chapter03/02-BalancedSymbols.html b/examples/chapter04/02-BalancedSymbols.html similarity index 100% rename from examples/chapter03/02-BalancedSymbols.html rename to examples/chapter04/02-BalancedSymbols.html diff --git a/examples/chapter03/02-BalancedSymbols.js b/examples/chapter04/02-BalancedSymbols.js similarity index 71% rename from examples/chapter03/02-BalancedSymbols.js rename to examples/chapter04/02-BalancedSymbols.js index 5084f479..614f44e7 100755 --- a/examples/chapter03/02-BalancedSymbols.js +++ b/examples/chapter04/02-BalancedSymbols.js @@ -1,4 +1,4 @@ -const parenthesesChecker = PacktDataStructuresAlgorithms.parenthesesChecker; +const { parenthesesChecker } = PacktDataStructuresAlgorithms; console.log('{([])}', parenthesesChecker('{([])}')); // true console.log('{{([][])}()}', parenthesesChecker('{{([][])}()}')); // true diff --git a/examples/chapter03/03-DecimalToBinary.html b/examples/chapter04/03-DecimalToBinary.html similarity index 100% rename from examples/chapter03/03-DecimalToBinary.html rename to examples/chapter04/03-DecimalToBinary.html diff --git a/examples/chapter03/03-DecimalToBinary.js b/examples/chapter04/03-DecimalToBinary.js similarity index 73% rename from examples/chapter03/03-DecimalToBinary.js rename to examples/chapter04/03-DecimalToBinary.js index eebdf916..f39fcb1d 100755 --- a/examples/chapter03/03-DecimalToBinary.js +++ b/examples/chapter04/03-DecimalToBinary.js @@ -1,5 +1,5 @@ -const decimalToBinary = PacktDataStructuresAlgorithms.parenthesesChecker; -const baseConverter = PacktDataStructuresAlgorithms.baseConverter; +const { decimalToBinary } = PacktDataStructuresAlgorithms; +const { baseConverter } = PacktDataStructuresAlgorithms; // 233 == 11101001 // 2x(10x10) + 3x(10) + 3x(1) diff --git a/examples/chapter03/04-TowerOfHanoi.html b/examples/chapter04/04-TowerOfHanoi.html similarity index 100% rename from examples/chapter03/04-TowerOfHanoi.html rename to examples/chapter04/04-TowerOfHanoi.html diff --git a/examples/chapter04/04-TowerOfHanoi.js b/examples/chapter04/04-TowerOfHanoi.js new file mode 100755 index 00000000..f5d85cf7 --- /dev/null +++ b/examples/chapter04/04-TowerOfHanoi.js @@ -0,0 +1,6 @@ +const { hanoiStack } = PacktDataStructuresAlgorithms; +const { hanoi } = PacktDataStructuresAlgorithms; + +console.log(hanoiStack(3)); + +console.log(hanoi(3, 'source', 'helper', 'dest')); diff --git a/examples/chapter05/01-Queue.html b/examples/chapter05/01-Queue.html new file mode 100755 index 00000000..2e67f7f4 --- /dev/null +++ b/examples/chapter05/01-Queue.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter05/01-Queue.js b/examples/chapter05/01-Queue.js new file mode 100755 index 00000000..852a1b4d --- /dev/null +++ b/examples/chapter05/01-Queue.js @@ -0,0 +1,14 @@ +const { Queue } = PacktDataStructuresAlgorithms; + +const queue = new Queue(); +console.log(queue.isEmpty()); // outputs true +queue.enqueue('John'); +queue.enqueue('Jack'); +console.log(queue.toString()); // John,Jack +queue.enqueue('Camila'); +console.log(queue.toString()); // John,Jack,Camila +console.log(queue.size()); // outputs 3 +console.log(queue.isEmpty()); // outputs false +queue.dequeue(); // remove John +queue.dequeue(); // remove Jack +console.log(queue.toString()); // Camila diff --git a/examples/chapter05/02-Deque.html b/examples/chapter05/02-Deque.html new file mode 100755 index 00000000..99b838af --- /dev/null +++ b/examples/chapter05/02-Deque.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter05/02-Deque.js b/examples/chapter05/02-Deque.js new file mode 100755 index 00000000..4c84b6de --- /dev/null +++ b/examples/chapter05/02-Deque.js @@ -0,0 +1,17 @@ +const { Deque } = PacktDataStructuresAlgorithms; + +const deque = new Deque(); +console.log(deque.isEmpty()); // outputs true +deque.addBack('John'); +deque.addBack('Jack'); +console.log(deque.toString()); // John,Jack +deque.addBack('Camila'); +console.log(deque.toString()); // John,Jack,Camila +console.log(deque.size()); // outputs 3 +console.log(deque.isEmpty()); // outputs false +deque.removeFront(); // remove John +console.log(deque.toString()); // Jack,Camila +deque.removeBack(); // Camila decides to leave +console.log(deque.toString()); // Jack +deque.addFront('John'); // John comes back for information +console.log(deque.toString()); // John,Jack diff --git a/examples/chapter05/03-HotPotato.html b/examples/chapter05/03-HotPotato.html new file mode 100755 index 00000000..85d45104 --- /dev/null +++ b/examples/chapter05/03-HotPotato.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter05/03-HotPotato.js b/examples/chapter05/03-HotPotato.js new file mode 100755 index 00000000..686f6791 --- /dev/null +++ b/examples/chapter05/03-HotPotato.js @@ -0,0 +1,16 @@ +const { hotPotato } = PacktDataStructuresAlgorithms; + +const names = ['John', 'Jack', 'Camila', 'Ingrid', 'Carl']; +const result = hotPotato(names, 7); + +result.eliminated.forEach(name => { + console.log(`${name} was eliminated from the Hot Potato game.`); +}); + +console.log(`The winner is: ${result.winner}`); + +// Camila was eliminated from the Hot Potato game. +// Jack was eliminated from the Hot Potato game. +// Carl was eliminated from the Hot Potato game. +// Ingrid was eliminated from the Hot Potato game. +// The winner is: John diff --git a/examples/chapter05/04-PalindromeChecker.html b/examples/chapter05/04-PalindromeChecker.html new file mode 100755 index 00000000..785e0482 --- /dev/null +++ b/examples/chapter05/04-PalindromeChecker.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter05/04-PalindromeChecker.js b/examples/chapter05/04-PalindromeChecker.js new file mode 100755 index 00000000..99c29cf9 --- /dev/null +++ b/examples/chapter05/04-PalindromeChecker.js @@ -0,0 +1,8 @@ +const { palindromeChecker } = PacktDataStructuresAlgorithms; + +console.log('a', palindromeChecker('a')); +console.log('aa', palindromeChecker('aa')); +console.log('kayak', palindromeChecker('kayak')); +console.log('level', palindromeChecker('level')); +console.log('Was it a car or a cat I saw', palindromeChecker('Was it a car or a cat I saw')); +console.log('Step on no pets', palindromeChecker('Step on no pets')); diff --git a/examples/chapter06/01-LinkedList.html b/examples/chapter06/01-LinkedList.html new file mode 100644 index 00000000..df7c5591 --- /dev/null +++ b/examples/chapter06/01-LinkedList.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter06/01-LinkedList.js b/examples/chapter06/01-LinkedList.js new file mode 100644 index 00000000..8d7c6e49 --- /dev/null +++ b/examples/chapter06/01-LinkedList.js @@ -0,0 +1,48 @@ +const { LinkedList } = PacktDataStructuresAlgorithms; + +const list = new LinkedList(); + +console.log('push element 15'); +list.push(15); + +console.log('list.indexOf(15) => ', list.indexOf(15)); + +console.log('push element 10'); +list.push(10); + +console.log('list.toString() => ', list.toString()); +console.log('list.indexOf(10) => ', list.indexOf(10)); + +console.log('push element 13'); +list.push(13); + +console.log('list.toString() => ', list.toString()); +console.log('list.indexOf(13) => ', list.indexOf(13)); +console.log('list.indexOf(10) => ', list.indexOf(10)); + +console.log('push elements 11 and 12'); +list.push(11); +list.push(12); + +console.log('list.toString() => ', list.toString()); +console.log('list.removeAt(1) => ', list.removeAt(1)); +console.log('list.toString() => ', list.toString()); +console.log('list.removeAt(3) => ', list.removeAt(3)); +console.log('list.toString() => ', list.toString()); + +console.log('push element 14'); +list.push(14); + +console.log('list.toString() => ', list.toString()); +console.log('insert element 16 pos 0 => ', list.insert(16, 0)); +console.log('list.toString() => ', list.toString()); +console.log('insert element 17 pos 1 => ', list.insert(17, 1)); +console.log('list.toString() => ', list.toString()); +console.log('insert element 18 pos list.size() => ', list.insert(18, list.size())); +console.log('list.toString() => ', list.toString()); +console.log('remove element 16 => ', list.remove(16)); +console.log('list.toString() => ', list.toString()); +console.log('remove element 11 => ', list.remove(11)); +console.log('list.toString() => ', list.toString()); +console.log('remove element 18 => ', list.remove(18)); +console.log('list.toString() => ', list.toString()); diff --git a/examples/chapter06/02-DoublyLinkedList.html b/examples/chapter06/02-DoublyLinkedList.html new file mode 100644 index 00000000..1aea7c24 --- /dev/null +++ b/examples/chapter06/02-DoublyLinkedList.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter06/02-DoublyLinkedList.js b/examples/chapter06/02-DoublyLinkedList.js new file mode 100644 index 00000000..333f701c --- /dev/null +++ b/examples/chapter06/02-DoublyLinkedList.js @@ -0,0 +1,54 @@ +const { DoublyLinkedList } = PacktDataStructuresAlgorithms; + +const list = new DoublyLinkedList(); + +console.log('push element 15'); +list.push(15); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('push element 16'); +list.push(16); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('push element 17'); +list.push(17); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('insert element 13 pos 0 => ', list.insert(13, 0)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('insert element 18 pos 4 => ', list.insert(18, 4)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('insert element 14 pos 1 => ', list.insert(14, 1)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('list.removeAt(0) => ', list.removeAt(0)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('list.removeAt(list.size() - 1) => ', list.removeAt(list.size() - 1)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('list.removeAt(1) => ', list.removeAt(1)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('remove element 16 => ', list.remove(16)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('remove element 14 => ', list.remove(14)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); + +console.log('remove element 17 => ', list.remove(17)); +console.log('list.toString() => ', list.toString()); +console.log('list.inverseToString() => ', list.inverseToString()); diff --git a/examples/chapter06/03-CircularLinkedList.html b/examples/chapter06/03-CircularLinkedList.html new file mode 100644 index 00000000..10fbd6b6 --- /dev/null +++ b/examples/chapter06/03-CircularLinkedList.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter06/03-CircularLinkedList.js b/examples/chapter06/03-CircularLinkedList.js new file mode 100644 index 00000000..05178956 --- /dev/null +++ b/examples/chapter06/03-CircularLinkedList.js @@ -0,0 +1,32 @@ +const { CircularLinkedList } = PacktDataStructuresAlgorithms; + +const list = new CircularLinkedList(); + +console.log('push element 15'); +list.push(15); +console.log('list.toString() => ', list.toString()); + +console.log('push element 16'); +list.push(16); +console.log('list.toString() => ', list.toString()); + +console.log('insert element 14 pos 0 => ', list.insert(14, 0)); +console.log('list.toString() => ', list.toString()); + +console.log('insert element 14.5 pos 1 => ', list.insert(14.5, 1)); +console.log('list.toString() => ', list.toString()); + +console.log('insert element 17 pos 4 => ', list.insert(17, 4)); +console.log('list.toString() => ', list.toString()); + +console.log('list.removeAt(0) => ', list.removeAt(0)); +console.log('list.toString() => ', list.toString()); + +console.log('list.removeAt(1) => ', list.removeAt(1)); +console.log('list.toString() => ', list.toString()); + +console.log('list.removeAt(2) => ', list.removeAt(2)); +console.log('list.toString() => ', list.toString()); + +console.log('list.indexOf(14.5) => ', list.indexOf(14.5)); +console.log('list.indexOf(16) => ', list.indexOf(16)); diff --git a/examples/chapter06/04-SortedLinkedList.html b/examples/chapter06/04-SortedLinkedList.html new file mode 100644 index 00000000..9feb1a70 --- /dev/null +++ b/examples/chapter06/04-SortedLinkedList.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter06/04-SortedLinkedList.js b/examples/chapter06/04-SortedLinkedList.js new file mode 100644 index 00000000..c6351f8f --- /dev/null +++ b/examples/chapter06/04-SortedLinkedList.js @@ -0,0 +1,53 @@ +const { SortedLinkedList } = PacktDataStructuresAlgorithms; +const { util } = PacktDataStructuresAlgorithms; + +const list = new SortedLinkedList(); + +console.log(''); +for (let i = 5; i > 0; i--) { + list.push(i); +} + +console.log('list after pushing 5, 4, 3, 2, and 1 => ', list.toString()); + +console.log('list.removeAt(1) => ', list.removeAt(1)); + +console.log('remove element 16 => ', list.remove(5)); + +console.log('list.toString() => ', list.toString()); + +// ------- Example 02 + +class MyObj { + constructor(el1, el2) { + this.el1 = el1; + this.el2 = el2; + } + toString() { + return `${this.el1.toString()}|${this.el2.toString()}`; + } +} + +function myObjCompare(a, b) { + return a.toString().localeCompare(b.toString()); +} + +const ds = new SortedLinkedList(util.defaultEquals, myObjCompare); + +console.log('*** SortedLinkedList with custom sorting function'); + +ds.push(new MyObj(3, 4)); +console.log('push MyObj(3, 4)'); +console.log('list.toString() => ', ds.toString()); + +ds.push(new MyObj(1, 2)); +console.log('push MyObj(1, 2)'); +console.log('list.toString() => ', ds.toString()); + +ds.push(new MyObj(5, 6)); +console.log('push MyObj(5, 6)'); +console.log('list.toString() => ', ds.toString()); + +ds.insert(new MyObj(0, 0), 4); +console.log('insert MyObj(0, 0) pos 4 (pos ignored)'); +console.log('list.toString() => ', ds.toString()); diff --git a/examples/chapter06/05-StackLinkedList.html b/examples/chapter06/05-StackLinkedList.html new file mode 100644 index 00000000..c511e977 --- /dev/null +++ b/examples/chapter06/05-StackLinkedList.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter06/05-StackLinkedList.js b/examples/chapter06/05-StackLinkedList.js new file mode 100644 index 00000000..866e7f91 --- /dev/null +++ b/examples/chapter06/05-StackLinkedList.js @@ -0,0 +1,24 @@ +const { StackLinkedList } = PacktDataStructuresAlgorithms; + +const stack = new StackLinkedList(); + +console.log('stack.isEmpty() => ', stack.isEmpty()); // outputs true + +stack.push(5); +stack.push(8); + +console.log('stack after push 5 and 8 => ', stack.toString()); + +console.log('stack.peek() => ', stack.peek()); // outputs 8 + +stack.push(11); + +console.log('stack.size() after push 11 => ', stack.size()); // outputs 3 +console.log('stack.isEmpty() => ', stack.isEmpty()); // outputs false + +stack.push(15); + +stack.pop(); +stack.pop(); + +console.log('stack.size() after push 15 and pop twice => ', stack.size()); // outputs 2 diff --git a/examples/chapter07/01-Set.html b/examples/chapter07/01-Set.html new file mode 100755 index 00000000..cf2f575b --- /dev/null +++ b/examples/chapter07/01-Set.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter07/01-Set.js b/examples/chapter07/01-Set.js new file mode 100755 index 00000000..e893c2c8 --- /dev/null +++ b/examples/chapter07/01-Set.js @@ -0,0 +1,19 @@ +const { Set } = PacktDataStructuresAlgorithms; + +const set = new Set(); + +set.add(1); +console.log(set.values()); // outputs [1] +console.log(set.has(1)); // outputs true +console.log(set.size()); // outputs 1 + +set.add(2); +console.log(set.values()); // outputs [1, 2] +console.log(set.has(2)); // true +console.log(set.size()); // 2 + +set.delete(1); +console.log(set.values()); // outputs [2] + +set.delete(2); +console.log(set.values()); // outputs [] diff --git a/examples/chapter07/02-SetOperations.html b/examples/chapter07/02-SetOperations.html new file mode 100755 index 00000000..b55d7e0d --- /dev/null +++ b/examples/chapter07/02-SetOperations.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter07/02-SetOperations.js b/examples/chapter07/02-SetOperations.js new file mode 100755 index 00000000..2608c7ef --- /dev/null +++ b/examples/chapter07/02-SetOperations.js @@ -0,0 +1,66 @@ +const { Set } = PacktDataStructuresAlgorithms; + +// --------- Union ---------- + +let setA = new Set(); +setA.add(1); +setA.add(2); +setA.add(3); + +let setB = new Set(); +setB.add(3); +setB.add(4); +setB.add(5); +setB.add(6); + +const unionAB = setA.union(setB); +console.log(unionAB.values()); // [1, 2, 3, 4, 5, 6] + +// --------- Intersection ---------- + +setA = new Set(); +setA.add(1); +setA.add(2); +setA.add(3); + +setB = new Set(); +setB.add(2); +setB.add(3); +setB.add(4); + +const intersectionAB = setA.intersection(setB); +console.log(intersectionAB.values()); // [2, 3] + +// --------- Difference ---------- + +setA = new Set(); +setA.add(1); +setA.add(2); +setA.add(3); + +setB = new Set(); +setB.add(2); +setB.add(3); +setB.add(4); + +const differenceAB = setA.difference(setB); +console.log(differenceAB.values()); // [1] + +// --------- Subset ---------- + +setA = new Set(); +setA.add(1); +setA.add(2); + +setB = new Set(); +setB.add(1); +setB.add(2); +setB.add(3); + +const setC = new Set(); +setC.add(2); +setC.add(3); +setC.add(4); + +console.log(setA.isSubsetOf(setB)); // true +console.log(setA.isSubsetOf(setC)); // false diff --git a/examples/chapter07/03-ES2015Set.html b/examples/chapter07/03-ES2015Set.html new file mode 100755 index 00000000..7fe40e1b --- /dev/null +++ b/examples/chapter07/03-ES2015Set.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter07/03-ES2015Set.js b/examples/chapter07/03-ES2015Set.js new file mode 100755 index 00000000..721ea4d1 --- /dev/null +++ b/examples/chapter07/03-ES2015Set.js @@ -0,0 +1,72 @@ +const set = new Set(); + +set.add(1); +console.log(set.values()); // outputs @Iterator +console.log(set.has(1)); // outputs true +console.log(set.size); // outputs 1 + +set.add(2); +console.log(set.values()); // outputs [1, 2] +console.log(set.has(2)); // true +console.log(set.size); // 2 + +set.delete(1); +console.log(set.values()); // outputs [2] + +set.delete(2); +console.log(set.values()); // outputs [] + +const setA = new Set(); +setA.add(1); +setA.add(2); +setA.add(3); + +const setB = new Set(); +setB.add(2); +setB.add(3); +setB.add(4); + +// --------- Union ---------- +const union = (set1, set2) => { + const unionAb = new Set(); + set1.forEach(value => unionAb.add(value)); + set2.forEach(value => unionAb.add(value)); + return unionAb; +}; +console.log(union(setA, setB)); + +console.log(new Set([...setA, ...setB])); + +// --------- Intersection ---------- +const intersection = (set1, set2) => { + const intersectionSet = new Set(); + set1.forEach(value => { + if (set2.has(value)) { + intersectionSet.add(value); + } + }); + return intersectionSet; +}; +console.log(intersection(setA, setB)); + +console.log(new Set([...setA].filter(x => setB.has(x)))); + +// alternative - works on FF only +// console.log(new Set([x for (x of setA) if (setB.has(x))])); + +// --------- Difference ---------- +const difference = (set1, set2) => { + const differenceSet = new Set(); + set1.forEach(value => { + if (!set2.has(value)) { + differenceSet.add(value); + } + }); + return differenceSet; +}; +console.log(difference(setA, setB)); + +console.log(new Set([...setA].filter(x => !setB.has(x)))); + +// alternative - works on FF only +// console.log(new Set([x for (x of setA) if (!setB.has(x))])); diff --git a/examples/chapter08/01-Dictionaries.html b/examples/chapter08/01-Dictionaries.html new file mode 100755 index 00000000..d972458c --- /dev/null +++ b/examples/chapter08/01-Dictionaries.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter08/01-Dictionaries.js b/examples/chapter08/01-Dictionaries.js new file mode 100755 index 00000000..53433cc0 --- /dev/null +++ b/examples/chapter08/01-Dictionaries.js @@ -0,0 +1,28 @@ +const { Dictionary } = PacktDataStructuresAlgorithms; + +const dictionary = new Dictionary(); + +dictionary.set('Gandalf', 'gandalf@email.com'); +dictionary.set('John', 'johnsnow@email.com'); +dictionary.set('Tyrion', 'tyrion@email.com'); + +console.log(dictionary.hasKey('Gandalf')); // true +console.log(dictionary.size()); // 3 + +console.log(dictionary.keys()); // ["Gandalf", "John", "Tyrion"] +console.log(dictionary.values()); // ["gandalf@email.com", "johnsnow@email.com", "tyrion@email.com"] +console.log(dictionary.get('Tyrion')); // tyrion@email.com + +dictionary.remove('John'); + +console.log(dictionary.keys()); // ["Gandalf", "Tyrion"] +console.log(dictionary.values()); // ["gandalf@email.com", "tyrion@email.com"] + +console.log(dictionary.keyValues()); // [{key: "Gandalf", value: "gandalf@email.com"}, {key: "Tyrion", value: "tyrion@email.com"}] +console.log(dictionary.toString()); // [#Gandalf: gandalf@email.com],[#Tyrion: tyrion@email.com] + +dictionary.forEach((k, v) => { + console.log('forEach: ', `key: ${k}, value: ${v}`); +}); +// forEach: key: Gandalf, value: gandalf@email.com +// forEach: key: Tyrion, value: tyrion@email.com diff --git a/examples/chapter08/02-HashTable.html b/examples/chapter08/02-HashTable.html new file mode 100755 index 00000000..67ad128c --- /dev/null +++ b/examples/chapter08/02-HashTable.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter08/02-HashTable.js b/examples/chapter08/02-HashTable.js new file mode 100755 index 00000000..fbee2022 --- /dev/null +++ b/examples/chapter08/02-HashTable.js @@ -0,0 +1,51 @@ +const { HashTable } = PacktDataStructuresAlgorithms; + +const hash = new HashTable(); + +console.log(hash.hashCode('Gandalf') + ' - Gandalf'); +console.log(hash.hashCode('John') + ' - John'); +console.log(hash.hashCode('Tyrion') + ' - Tyrion'); + +console.log(' '); + +console.log(hash.hashCode('Ygritte') + ' - Ygritte'); +console.log(hash.hashCode('Jonathan') + ' - Jonathan'); +console.log(hash.hashCode('Jamie') + ' - Jamie'); +console.log(hash.hashCode('Jack') + ' - Jack'); +console.log(hash.hashCode('Jasmine') + ' - Jasmine'); +console.log(hash.hashCode('Jake') + ' - Jake'); +console.log(hash.hashCode('Nathan') + ' - Nathan'); +console.log(hash.hashCode('Athelstan') + ' - Athelstan'); +console.log(hash.hashCode('Sue') + ' - Sue'); +console.log(hash.hashCode('Aethelwulf') + ' - Aethelwulf'); +console.log(hash.hashCode('Sargeras') + ' - Sargeras'); + +hash.put('Ygritte', 'ygritte@email.com'); +hash.put('Jonathan', 'jonathan@email.com'); +hash.put('Jamie', 'jamie@email.com'); +hash.put('Jack', 'jack@email.com'); +hash.put('Jasmine', 'jasmine@email.com'); +hash.put('Jake', 'jake@email.com'); +hash.put('Nathan', 'nathan@email.com'); +hash.put('Athelstan', 'athelstan@email.com'); +hash.put('Sue', 'sue@email.com'); +hash.put('Aethelwulf', 'aethelwulf@email.com'); +hash.put('Sargeras', 'sargeras@email.com'); + +console.log('**** Printing Hash **** '); + +console.log(hash.toString()); +// {4 => [#Ygritte: ygritte@email.com]},{5 => [#Aethelwulf: aethelwulf@email.com]},{7 => [#Athelstan: athelstan@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Sargeras: sargeras@email.com]} + +console.log('**** Get **** '); + +console.log(hash.get('Ygritte')); // ygritte@email.com +console.log(hash.get('Loiane')); // jasmine@email.com + +console.log('**** Remove **** '); + +hash.remove('Ygritte'); +console.log(hash.get('Ygritte')); // undefined + +console.log(hash.toString()); +// {5 => [#Aethelwulf: aethelwulf@email.com]},{7 => [#Athelstan: athelstan@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Sargeras: sargeras@email.com]} diff --git a/examples/chapter08/03-HashCollisionSeparateChaining.html b/examples/chapter08/03-HashCollisionSeparateChaining.html new file mode 100755 index 00000000..cddcc3db --- /dev/null +++ b/examples/chapter08/03-HashCollisionSeparateChaining.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter08/03-HashCollisionSeparateChaining.js b/examples/chapter08/03-HashCollisionSeparateChaining.js new file mode 100755 index 00000000..f791ba89 --- /dev/null +++ b/examples/chapter08/03-HashCollisionSeparateChaining.js @@ -0,0 +1,46 @@ +const { HashTableSeparateChaining } = PacktDataStructuresAlgorithms; + +const hashTable = new HashTableSeparateChaining(); + +hashTable.put('Ygritte', 'ygritte@email.com'); +hashTable.put('Jonathan', 'jonathan@email.com'); +hashTable.put('Jamie', 'jamie@email.com'); +hashTable.put('Jack', 'jack@email.com'); +hashTable.put('Jasmine', 'jasmine@email.com'); +hashTable.put('Jake', 'jake@email.com'); +hashTable.put('Nathan', 'nathan@email.com'); +hashTable.put('Athelstan', 'athelstan@email.com'); +hashTable.put('Sue', 'sue@email.com'); +hashTable.put('Aethelwulf', 'aethelwulf@email.com'); +hashTable.put('Sargeras', 'sargeras@email.com'); + +console.log('**** Printing Hash **** '); + +console.log(hashTable.toString()); +// {4 => [#Ygritte: ygritte@email.com]},{5 => [#Jonathan: jonathan@email.com],[#Jamie: jamie@email.com],[#Sue: sue@email.com],[#Aethelwulf: aethelwulf@email.com]},{7 => [#Jack: jack@email.com],[#Athelstan: athelstan@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com],[#Sargeras: sargeras@email.com]} + +console.log('**** Get **** '); + +console.log(hashTable.get('Jamie')); // jamie@email.com +console.log(hashTable.get('Sue')); // sue@email.com +console.log(hashTable.get('Jonathan')); // jonathan@email.com +console.log(hashTable.get('Loiane')); // undefined + +console.log('**** Remove **** '); + +console.log(hashTable.remove('Ygritte')); // true +console.log(hashTable.get('Ygritte')); // undefined +console.log(hashTable.toString()); +// {5 => [#Jonathan: jonathan@email.com],[#Jamie: jamie@email.com],[#Sue: sue@email.com],[#Aethelwulf: aethelwulf@email.com]},{7 => [#Jack: jack@email.com],[#Athelstan: athelstan@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com],[#Sargeras: sargeras@email.com]} + +console.log(hashTable.remove('Sue')); // true +console.log(hashTable.toString()); +// {5 => [#Jonathan: jonathan@email.com],[#Jamie: jamie@email.com],[#Aethelwulf: aethelwulf@email.com]},{7 => [#Jack: jack@email.com],[#Athelstan: athelstan@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com],[#Sargeras: sargeras@email.com]} + +console.log(hashTable.remove('Jamie')); // true +console.log(hashTable.toString()); +// {5 => [#Jonathan: jonathan@email.com],[#Aethelwulf: aethelwulf@email.com]},{7 => [#Jack: jack@email.com],[#Athelstan: athelstan@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com],[#Sargeras: sargeras@email.com]} + +console.log(hashTable.remove('Aethelwulf')); // true +console.log(hashTable.toString()); +// {5 => [#Jonathan: jonathan@email.com]},{7 => [#Jack: jack@email.com],[#Athelstan: athelstan@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com],[#Sargeras: sargeras@email.com]} diff --git a/examples/chapter08/04-HashCollisionLinearProbing.html b/examples/chapter08/04-HashCollisionLinearProbing.html new file mode 100755 index 00000000..6f8bbe52 --- /dev/null +++ b/examples/chapter08/04-HashCollisionLinearProbing.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter08/04-HashCollisionLinearProbing.js b/examples/chapter08/04-HashCollisionLinearProbing.js new file mode 100755 index 00000000..b75cd98d --- /dev/null +++ b/examples/chapter08/04-HashCollisionLinearProbing.js @@ -0,0 +1,42 @@ +const { HashTableLinearProbing } = PacktDataStructuresAlgorithms; + +const hashTable = new HashTableLinearProbing(); + +hashTable.put('Ygritte', 'ygritte@email.com'); +hashTable.put('Jonathan', 'jonathan@email.com'); +hashTable.put('Jamie', 'jamie@email.com'); +hashTable.put('Jack', 'jack@email.com'); +hashTable.put('Jasmine', 'jasmine@email.com'); +hashTable.put('Jake', 'jake@email.com'); +hashTable.put('Nathan', 'nathan@email.com'); +hashTable.put('Athelstan', 'athelstan@email.com'); +hashTable.put('Sue', 'sue@email.com'); +hashTable.put('Aethelwulf', 'aethelwulf@email.com'); +hashTable.put('Sargeras', 'sargeras@email.com'); + +console.log('**** Printing Hash **** '); + +console.log(hashTable.toString()); +// {4 => [#Ygritte: ygritte@email.com]},{5 => [#Jonathan: jonathan@email.com]},{6 => [#Jamie: jamie@email.com]},{7 => [#Jack: jack@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com]},{11 => [#Athelstan: athelstan@email.com]},{12 => [#Sue: sue@email.com]},{13 => [#Aethelwulf: aethelwulf@email.com]},{14 => [#Sargeras: sargeras@email.com]} +console.log('**** Get **** '); + +console.log(hashTable.get('Nathan')); // nathan@email.com +console.log(hashTable.get('Loiane')); // undefined + +console.log('**** Remove **** '); + +hashTable.remove('Ygritte'); +console.log(hashTable.get('Ygritte')); // undefined +console.log(hashTable.toString()); +// {5 => [#Jonathan: jonathan@email.com]},{6 => [#Jamie: jamie@email.com]},{7 => [#Jack: jack@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com]},{11 => [#Athelstan: athelstan@email.com]},{12 => [#Sue: sue@email.com]},{13 => [#Aethelwulf: aethelwulf@email.com]},{14 => [#Sargeras: sargeras@email.com]} + +console.log('**** Remove Test 2 **** '); +console.log('Removing Jonathan', hashTable.remove('Jonathan')); // true +console.log('**** Print **** '); +console.log(hashTable.toString()); +// {5 => [#Jamie: jamie@email.com]},{6 => [#Sue: sue@email.com]},{7 => [#Jack: jack@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com]},{11 => [#Athelstan: athelstan@email.com]},{12 => [#Aethelwulf: aethelwulf@email.com]},{13 => [#Sargeras: sargeras@email.com]} + +console.log(hashTable.get('Jamie')); // jamie@email.com +console.log('**** Print **** '); +console.log(hashTable.toString()); +// {5 => [#Jamie: jamie@email.com]},{6 => [#Sue: sue@email.com]},{7 => [#Jack: jack@email.com]},{8 => [#Jasmine: jasmine@email.com]},{9 => [#Jake: jake@email.com]},{10 => [#Nathan: nathan@email.com]},{11 => [#Athelstan: athelstan@email.com]},{12 => [#Aethelwulf: aethelwulf@email.com]},{13 => [#Sargeras: sargeras@email.com]} diff --git a/examples/chapter08/05-ES2015Map.html b/examples/chapter08/05-ES2015Map.html new file mode 100755 index 00000000..8a2ade05 --- /dev/null +++ b/examples/chapter08/05-ES2015Map.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter08/05-ES2015Map.js b/examples/chapter08/05-ES2015Map.js new file mode 100755 index 00000000..e944f988 --- /dev/null +++ b/examples/chapter08/05-ES2015Map.js @@ -0,0 +1,17 @@ +const map = new Map(); + +map.set('Gandalf', 'gandalf@email.com'); +map.set('John', 'johnsnow@email.com'); +map.set('Tyrion', 'tyrion@email.com'); + +console.log(map.has('Gandalf')); // true +console.log(map.size); // 3 + +console.log(map.keys()); // MapIterator {"Gandalf", "John", "Tyrion"} +console.log(map.values()); // MapIterator {"gandalf@email.com", "johnsnow@email.com", "tyrion@email.com"} +console.log(map.get('Tyrion')); // tyrion@email.com + +map.delete('John'); + +console.log(map.keys()); // MapIterator {"Gandalf", "Tyrion"} +console.log(map.values()); // MapIterator {"gandalf@email.com", "tyrion@email.com"} diff --git a/examples/chapter08/06-ES2015WeakMap.html b/examples/chapter08/06-ES2015WeakMap.html new file mode 100755 index 00000000..15daf46d --- /dev/null +++ b/examples/chapter08/06-ES2015WeakMap.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter08/06-ES2015WeakMap.js b/examples/chapter08/06-ES2015WeakMap.js new file mode 100755 index 00000000..1f2d01bc --- /dev/null +++ b/examples/chapter08/06-ES2015WeakMap.js @@ -0,0 +1,18 @@ +const map = new WeakMap(); + +const ob1 = { name: 'Gandalf' }; +const ob2 = { name: 'John' }; +const ob3 = { name: 'Tyrion' }; + +map.set(ob1, 'gandalf@email.com'); +map.set(ob2, 'johnsnow@email.com'); +map.set(ob3, 'tyrion@email.com'); + +console.log(map.has(ob1)); // true +console.log(map.has(ob2)); // true +console.log(map.has(ob3)); // true + +console.log(map.get(ob3)); // tyrion@email.com + +map.delete(ob2); +console.log(map.has(ob2)); // false diff --git a/examples/chapter08/07-ES2015WeakSet.html b/examples/chapter08/07-ES2015WeakSet.html new file mode 100755 index 00000000..7a4f82f4 --- /dev/null +++ b/examples/chapter08/07-ES2015WeakSet.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter08/07-ES2015WeakSet.js b/examples/chapter08/07-ES2015WeakSet.js new file mode 100755 index 00000000..0e849f1a --- /dev/null +++ b/examples/chapter08/07-ES2015WeakSet.js @@ -0,0 +1,16 @@ +var set = new WeakSet(); + +const ob1 = { name: 'Gandalf' }; +const ob2 = { name: 'John' }; +const ob3 = { name: 'Tyrion' }; + +set.add(ob1); +set.add(ob2); +set.add(ob3); + +console.log(set.has(ob1)); // true +console.log(set.has(ob2)); // true +console.log(set.has(ob3)); // true + +set.delete(ob2); +console.log(set.has(ob2)); // false diff --git a/examples/chapter09/01-IntroRecursion.html b/examples/chapter09/01-IntroRecursion.html new file mode 100644 index 00000000..ae42e54f --- /dev/null +++ b/examples/chapter09/01-IntroRecursion.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter09/01-IntroRecursion.js b/examples/chapter09/01-IntroRecursion.js new file mode 100644 index 00000000..d2843215 --- /dev/null +++ b/examples/chapter09/01-IntroRecursion.js @@ -0,0 +1,26 @@ + +// functions commented below - inifite loop + +/* +function recursiveFunction(someParam) { + recursiveFunction(someParam); +} + +function recursiveFunction1(someParam) { + recursiveFunction2(someParam); +} + +function recursiveFunction2(someParam) { + recursiveFunction1(someParam); +} +*/ + +function understandRecursion(doIunderstandRecursion) { + const recursionAnswer = confirm('Do you understand recursion?'); // function logic + if (recursionAnswer === true) { // base case or stop point + return true; + } + understandRecursion(recursionAnswer); // recursive call +} + +understandRecursion(false); diff --git a/examples/chapter09/02-Factorial.html b/examples/chapter09/02-Factorial.html new file mode 100755 index 00000000..94c6c103 --- /dev/null +++ b/examples/chapter09/02-Factorial.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter09/02-Factorial.js b/examples/chapter09/02-Factorial.js new file mode 100644 index 00000000..774006f9 --- /dev/null +++ b/examples/chapter09/02-Factorial.js @@ -0,0 +1,26 @@ +// @ts-check + +function factorialIterative(number) { + if (number < 0) { + return undefined; + } + let total = 1; + for (let n = number; n > 1; n--) { + total = total * n; + } + return total; +} + +console.log('factorialIterative(5): ', factorialIterative(5)); +console.log('factorialIterative(3): ', factorialIterative(3)); + +function factorial(n) { + // console.trace(); + if (n === 1 || n === 0) { + return 1; + } + return n * factorial(n - 1); +} + +console.log('factorial(5): ', factorial(5)); +console.log('factorial(3): ', factorial(3)); diff --git a/examples/chapter09/03-JSCallStack.html b/examples/chapter09/03-JSCallStack.html new file mode 100644 index 00000000..0f88040d --- /dev/null +++ b/examples/chapter09/03-JSCallStack.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter09/03-JSCallStack.js b/examples/chapter09/03-JSCallStack.js new file mode 100644 index 00000000..fcfd6ef8 --- /dev/null +++ b/examples/chapter09/03-JSCallStack.js @@ -0,0 +1,11 @@ +let i = 0; +function recursiveFn() { + i++; + recursiveFn(); +} + +try { + recursiveFn(); +} catch (ex) { + console.log('i = ' + i + ' error: ' + ex); +} diff --git a/examples/chapter09/04-Fibonacci.html b/examples/chapter09/04-Fibonacci.html new file mode 100755 index 00000000..8413c457 --- /dev/null +++ b/examples/chapter09/04-Fibonacci.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter09/04-Fibonacci.js b/examples/chapter09/04-Fibonacci.js new file mode 100644 index 00000000..67eae205 --- /dev/null +++ b/examples/chapter09/04-Fibonacci.js @@ -0,0 +1,43 @@ +function fibonacci(n){ + if (n < 1) return 0; // {1} + if (n <= 2) return 1; // {2} + return fibonacci(n - 1) + fibonacci(n - 2); // {3} +} + +console.log('fibonacci(2)', fibonacci(2)); +console.log('fibonacci(3)', fibonacci(3)); +console.log('fibonacci(4)', fibonacci(4)); +console.log('fibonacci(5)', fibonacci(5)); + +function fibonacciIterative(n){ + let fibNMinus2 = 0; + let fibNMinus1 = 1; + let fibN = n; + for (let i = 2; i <= n; i++) { // n >= 2 + fibN = fibNMinus1 + fibNMinus2; // f(n-1) + f(n-2) + fibNMinus2 = fibNMinus1; + fibNMinus1 = fibN; + } + return fibN; +} + +console.log('fibonacciIterative(2)', fibonacciIterative(2)); +console.log('fibonacciIterative(3)', fibonacciIterative(3)); +console.log('fibonacciIterative(4)', fibonacciIterative(4)); +console.log('fibonacciIterative(5)', fibonacciIterative(5)); + +function fibonacciMemoization(n) { + const memo = [0, 1]; + const fibonacci = (n) => { + if (memo[n] != null) return memo[n]; + return memo[n] = fibonacci(n - 1) + fibonacci(n - 2); + }; + return fibonacci(n); +} + +console.log('fibonacciMemoization(2)', fibonacciMemoization(2)); +console.log('fibonacciMemoization(3)', fibonacciMemoization(3)); +console.log('fibonacciMemoization(4)', fibonacciMemoization(4)); +console.log('fibonacciMemoization(5)', fibonacciMemoization(5)); + +// https://jsperf.com/fibonacci-comparison-jsbook diff --git a/examples/chapter10/01-UsingMinHeap.html b/examples/chapter10/01-UsingMinHeap.html new file mode 100644 index 00000000..83814ba1 --- /dev/null +++ b/examples/chapter10/01-UsingMinHeap.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter10/01-UsingMinHeap.js b/examples/chapter10/01-UsingMinHeap.js new file mode 100644 index 00000000..59b7753b --- /dev/null +++ b/examples/chapter10/01-UsingMinHeap.js @@ -0,0 +1,27 @@ +const { MinHeap } = PacktDataStructuresAlgorithms; + +let heap = new MinHeap(); + +heap.insert(2); +heap.insert(3); +heap.insert(4); +heap.insert(5); + +heap.insert(2); + +console.log(heap.getAsArray()); + +console.log('Heap size: ', heap.size()); // 5 +console.log('Heap is empty: ', heap.isEmpty()); // false +console.log('Heap min value: ', heap.findMinimum()); // 1 + +heap = new MinHeap(); +for (let i = 1; i < 10; i++) { + heap.insert(i); +} + +console.log(heap.getAsArray()); + +console.log('Extract minimum: ', heap.extract()); // 1 +console.log(heap.getAsArray()); // [2, 4, 3, 8, 5, 6, 7, 9] + diff --git a/examples/chapter10/02-UsingMaxHeap.html b/examples/chapter10/02-UsingMaxHeap.html new file mode 100644 index 00000000..9d573bda --- /dev/null +++ b/examples/chapter10/02-UsingMaxHeap.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter10/02-UsingMaxHeap.js b/examples/chapter10/02-UsingMaxHeap.js new file mode 100644 index 00000000..f1a5b97d --- /dev/null +++ b/examples/chapter10/02-UsingMaxHeap.js @@ -0,0 +1,27 @@ +const { MaxHeap } = PacktDataStructuresAlgorithms; + +const maxHeap = new MaxHeap(); + +maxHeap.insert(2); +maxHeap.insert(3); +maxHeap.insert(4); +maxHeap.insert(5); + +maxHeap.insert(1); + +console.log(maxHeap.getAsArray()); + +console.log('Heap size: ', maxHeap.size()); // 5 +console.log('Heap is empty: ', maxHeap.isEmpty()); // false +console.log('Heap min value: ', maxHeap.findMinimum()); // 5 + +maxHeap.insert(6); +maxHeap.insert(9); +maxHeap.insert(10); +maxHeap.insert(14); + +console.log(maxHeap.getAsArray()); + +console.log('Extract minimum: ', maxHeap.extract()); +console.log(maxHeap.getAsArray()); + diff --git a/examples/chapter10/03-HeapSort.html b/examples/chapter10/03-HeapSort.html new file mode 100644 index 00000000..e52c43f4 --- /dev/null +++ b/examples/chapter10/03-HeapSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter10/03-HeapSort.js b/examples/chapter10/03-HeapSort.js new file mode 100644 index 00000000..9d9b1ac0 --- /dev/null +++ b/examples/chapter10/03-HeapSort.js @@ -0,0 +1,7 @@ +const { heapSort } = PacktDataStructuresAlgorithms; + +console.log('********** Heap Sort **********'); +const array = [7, 6, 3, 5, 4, 1, 2]; + +console.log('Before sorting: ', array); +console.log('After sorting: ', heapSort(array)); diff --git a/examples/chapter11/01-UsingMinHeap.html b/examples/chapter11/01-UsingMinHeap.html new file mode 100644 index 00000000..83814ba1 --- /dev/null +++ b/examples/chapter11/01-UsingMinHeap.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter11/01-UsingMinHeap.js b/examples/chapter11/01-UsingMinHeap.js new file mode 100644 index 00000000..59b7753b --- /dev/null +++ b/examples/chapter11/01-UsingMinHeap.js @@ -0,0 +1,27 @@ +const { MinHeap } = PacktDataStructuresAlgorithms; + +let heap = new MinHeap(); + +heap.insert(2); +heap.insert(3); +heap.insert(4); +heap.insert(5); + +heap.insert(2); + +console.log(heap.getAsArray()); + +console.log('Heap size: ', heap.size()); // 5 +console.log('Heap is empty: ', heap.isEmpty()); // false +console.log('Heap min value: ', heap.findMinimum()); // 1 + +heap = new MinHeap(); +for (let i = 1; i < 10; i++) { + heap.insert(i); +} + +console.log(heap.getAsArray()); + +console.log('Extract minimum: ', heap.extract()); // 1 +console.log(heap.getAsArray()); // [2, 4, 3, 8, 5, 6, 7, 9] + diff --git a/examples/chapter11/02-UsingMaxHeap.html b/examples/chapter11/02-UsingMaxHeap.html new file mode 100644 index 00000000..9d573bda --- /dev/null +++ b/examples/chapter11/02-UsingMaxHeap.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter11/02-UsingMaxHeap.js b/examples/chapter11/02-UsingMaxHeap.js new file mode 100644 index 00000000..f1a5b97d --- /dev/null +++ b/examples/chapter11/02-UsingMaxHeap.js @@ -0,0 +1,27 @@ +const { MaxHeap } = PacktDataStructuresAlgorithms; + +const maxHeap = new MaxHeap(); + +maxHeap.insert(2); +maxHeap.insert(3); +maxHeap.insert(4); +maxHeap.insert(5); + +maxHeap.insert(1); + +console.log(maxHeap.getAsArray()); + +console.log('Heap size: ', maxHeap.size()); // 5 +console.log('Heap is empty: ', maxHeap.isEmpty()); // false +console.log('Heap min value: ', maxHeap.findMinimum()); // 5 + +maxHeap.insert(6); +maxHeap.insert(9); +maxHeap.insert(10); +maxHeap.insert(14); + +console.log(maxHeap.getAsArray()); + +console.log('Extract minimum: ', maxHeap.extract()); +console.log(maxHeap.getAsArray()); + diff --git a/examples/chapter11/03-HeapSort.html b/examples/chapter11/03-HeapSort.html new file mode 100644 index 00000000..e52c43f4 --- /dev/null +++ b/examples/chapter11/03-HeapSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter11/03-HeapSort.js b/examples/chapter11/03-HeapSort.js new file mode 100644 index 00000000..9d9b1ac0 --- /dev/null +++ b/examples/chapter11/03-HeapSort.js @@ -0,0 +1,7 @@ +const { heapSort } = PacktDataStructuresAlgorithms; + +console.log('********** Heap Sort **********'); +const array = [7, 6, 3, 5, 4, 1, 2]; + +console.log('Before sorting: ', array); +console.log('After sorting: ', heapSort(array)); diff --git a/examples/chapter12/01-UsingGraphs.html b/examples/chapter12/01-UsingGraphs.html new file mode 100644 index 00000000..49eb9bff --- /dev/null +++ b/examples/chapter12/01-UsingGraphs.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter12/01-UsingGraphs.js b/examples/chapter12/01-UsingGraphs.js new file mode 100644 index 00000000..dde70c0d --- /dev/null +++ b/examples/chapter12/01-UsingGraphs.js @@ -0,0 +1,23 @@ +const { Graph } = PacktDataStructuresAlgorithms; + +const graph = new Graph(); + +const myVertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']; + +for (let i = 0; i < myVertices.length; i++) { + graph.addVertex(myVertices[i]); +} +graph.addEdge('A', 'B'); +graph.addEdge('A', 'C'); +graph.addEdge('A', 'D'); +graph.addEdge('C', 'D'); +graph.addEdge('C', 'G'); +graph.addEdge('D', 'G'); +graph.addEdge('D', 'H'); +graph.addEdge('B', 'E'); +graph.addEdge('B', 'F'); +graph.addEdge('E', 'I'); + +console.log('********* printing graph ***********'); + +console.log(graph.toString()); diff --git a/examples/chapter12/02-BFS.html b/examples/chapter12/02-BFS.html new file mode 100644 index 00000000..044da5d6 --- /dev/null +++ b/examples/chapter12/02-BFS.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter12/02-BFS.js b/examples/chapter12/02-BFS.js new file mode 100644 index 00000000..d65c8b66 --- /dev/null +++ b/examples/chapter12/02-BFS.js @@ -0,0 +1,54 @@ +const { Graph } = PacktDataStructuresAlgorithms; +const { Stack } = PacktDataStructuresAlgorithms; +const { BFS } = PacktDataStructuresAlgorithms; +const { breadthFirstSearch } = PacktDataStructuresAlgorithms; + +const graph = new Graph(); + +const myVertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']; + +for (let i = 0; i < myVertices.length; i++) { + graph.addVertex(myVertices[i]); +} +graph.addEdge('A', 'B'); +graph.addEdge('A', 'C'); +graph.addEdge('A', 'D'); +graph.addEdge('C', 'D'); +graph.addEdge('C', 'G'); +graph.addEdge('D', 'G'); +graph.addEdge('D', 'H'); +graph.addEdge('B', 'E'); +graph.addEdge('B', 'F'); +graph.addEdge('E', 'I'); + +console.log('********* printing graph ***********'); + +console.log(graph.toString()); + +console.log('********* bfs with callback ***********'); + +const printVertex = (value) => console.log('Visited vertex: ' + value); + +breadthFirstSearch(graph, myVertices[0], printVertex); + +console.log('********* sorthest path - BFS ***********'); +const shortestPathA = BFS(graph, myVertices[0]); +console.log(shortestPathA.distances); +console.log(shortestPathA.predecessors); + +//from A to all other vertices +const fromVertex = myVertices[0]; + +for (let i = 1; i < myVertices.length; i++) { + const toVertex = myVertices[i]; + const path = new Stack(); + for (let v = toVertex; v !== fromVertex; v = shortestPathA.predecessors[v]) { + path.push(v); + } + path.push(fromVertex); + let s = path.pop(); + while (!path.isEmpty()) { + s += ' - ' + path.pop(); + } + console.log(s); +} diff --git a/examples/chapter12/03-DFS.html b/examples/chapter12/03-DFS.html new file mode 100644 index 00000000..1a5bd4f3 --- /dev/null +++ b/examples/chapter12/03-DFS.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter12/03-DFS.js b/examples/chapter12/03-DFS.js new file mode 100644 index 00000000..5c440a74 --- /dev/null +++ b/examples/chapter12/03-DFS.js @@ -0,0 +1,67 @@ +const { Graph } = PacktDataStructuresAlgorithms; +const { depthFirstSearch } = PacktDataStructuresAlgorithms; +const { DFS } = PacktDataStructuresAlgorithms; + +let graph = new Graph(true); + +let myVertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']; + +for (let i = 0; i < myVertices.length; i++) { + graph.addVertex(myVertices[i]); +} +graph.addEdge('A', 'B'); +graph.addEdge('A', 'C'); +graph.addEdge('A', 'D'); +graph.addEdge('C', 'D'); +graph.addEdge('C', 'G'); +graph.addEdge('D', 'G'); +graph.addEdge('D', 'H'); +graph.addEdge('B', 'E'); +graph.addEdge('B', 'F'); +graph.addEdge('E', 'I'); + +console.log('********* printing graph ***********'); + +console.log(graph.toString()); + +console.log('********* dfs with callback ***********'); + +const printVertex = value => console.log('Visited vertex: ' + value); + +depthFirstSearch(graph, printVertex); + +console.log('********* topological sort - DFS ***********'); + +graph = new Graph(true); // directed graph + +myVertices = ['A', 'B', 'C', 'D', 'E', 'F']; +for (i = 0; i < myVertices.length; i++) { + graph.addVertex(myVertices[i]); +} +graph.addEdge('A', 'C'); +graph.addEdge('A', 'D'); +graph.addEdge('B', 'D'); +graph.addEdge('B', 'E'); +graph.addEdge('C', 'F'); +graph.addEdge('F', 'E'); + +const result = DFS(graph); +console.log('discovery', result.discovery); +console.log('finished', result.finished); +console.log('predecessors', result.predecessors); + +const fTimes = result.finished; +s = ''; +for (let count = 0; count < myVertices.length; count++) { + let max = 0; + let maxName = null; + for (i = 0; i < myVertices.length; i++) { + if (fTimes[myVertices[i]] > max) { + max = fTimes[myVertices[i]]; + maxName = myVertices[i]; + } + } + s += ' - ' + maxName; + delete fTimes[maxName]; +} +console.log(s); diff --git a/examples/chapter12/04-Dijkstra.html b/examples/chapter12/04-Dijkstra.html new file mode 100644 index 00000000..8b9e0f74 --- /dev/null +++ b/examples/chapter12/04-Dijkstra.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter12/04-Dijkstra.js b/examples/chapter12/04-Dijkstra.js new file mode 100644 index 00000000..dfa58854 --- /dev/null +++ b/examples/chapter12/04-Dijkstra.js @@ -0,0 +1,18 @@ +const { dijkstra } = PacktDataStructuresAlgorithms; + +const graph = [ + [0, 2, 4, 0, 0, 0], + [0, 0, 2, 4, 2, 0], + [0, 0, 0, 0, 3, 0], + [0, 0, 0, 0, 0, 2], + [0, 0, 0, 3, 0, 2], + [0, 0, 0, 0, 0, 0] +]; + +console.log("********* Dijkstra's Algorithm - Shortest Path ***********"); + +const dist = dijkstra(graph, 0); + +for (i = 0; i < dist.length; i++){ + console.log(i + '\t\t' + dist[i]); +} diff --git a/examples/chapter12/05-Floyd-Warshall.html b/examples/chapter12/05-Floyd-Warshall.html new file mode 100644 index 00000000..be411625 --- /dev/null +++ b/examples/chapter12/05-Floyd-Warshall.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter12/05-Floyd-Warshall.js b/examples/chapter12/05-Floyd-Warshall.js new file mode 100644 index 00000000..18c2dee6 --- /dev/null +++ b/examples/chapter12/05-Floyd-Warshall.js @@ -0,0 +1,25 @@ +const { floydWarshall } = PacktDataStructuresAlgorithms; + +const INF = Infinity; +const graph = [ + [INF, 2, 4, INF, INF, INF], + [INF, INF, 2, 4, 2, INF], + [INF, INF, INF, INF, 3, INF], + [INF, INF, INF, INF, INF, 2], + [INF, INF, INF, 3, INF, 2], + [INF, INF, INF, INF, INF, INF] +]; + +console.log('********* Floyd-Warshall Algorithm - All-Pairs Shortest Path ***********'); + +dist = floydWarshall(graph); + +let s = ''; +for (let i = 0; i < dist.length; ++i) { + s = ''; + for (var j = 0; j < dist.length; ++j) { + if (dist[i][j] === INF) s += 'INF '; + else s += dist[i][j] + ' '; + } + console.log(s); +} diff --git a/examples/chapter12/06-Prim.html b/examples/chapter12/06-Prim.html new file mode 100644 index 00000000..7cbb2537 --- /dev/null +++ b/examples/chapter12/06-Prim.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter12/06-Prim.js b/examples/chapter12/06-Prim.js new file mode 100644 index 00000000..cb971a4e --- /dev/null +++ b/examples/chapter12/06-Prim.js @@ -0,0 +1,19 @@ +const { prim } = PacktDataStructuresAlgorithms; + +const graph = [ + [0, 2, 4, 0, 0, 0], + [2, 0, 2, 4, 2, 0], + [4, 2, 0, 0, 3, 0], + [0, 4, 0, 0, 3, 2], + [0, 2, 3, 3, 0, 2], + [0, 0, 0, 2, 2, 0] +]; + +console.log("********* Prim's Algorithm - Minimum Spanning Tree ***********"); + +const parent = prim(graph); + +console.log('Edge Weight'); +for (let i = 1; i < graph.length; i++) { + console.log(parent[i] + ' - ' + i + ' ' + graph[i][parent[i]]); +} diff --git a/examples/chapter12/07-Kruskal.html b/examples/chapter12/07-Kruskal.html new file mode 100644 index 00000000..89e214fb --- /dev/null +++ b/examples/chapter12/07-Kruskal.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter12/07-Kruskal.js b/examples/chapter12/07-Kruskal.js new file mode 100644 index 00000000..460fbd83 --- /dev/null +++ b/examples/chapter12/07-Kruskal.js @@ -0,0 +1,19 @@ +const { kruskal } = PacktDataStructuresAlgorithms; + +const graph = [ + [0, 2, 4, 0, 0, 0], + [2, 0, 2, 4, 2, 0], + [4, 2, 0, 0, 3, 0], + [0, 4, 0, 0, 3, 2], + [0, 2, 3, 3, 0, 2], + [0, 0, 0, 2, 2, 0] +]; + +console.log('********* Kruskal Algorithm - Minimum Spanning Tree ***********'); + +const parent = kruskal(graph); + +console.log('Edge Weight'); +for (i = 1; i < graph.length; i++) { + console.log(parent[i] + ' - ' + i + ' ' + graph[i][parent[i]]); +} diff --git a/examples/chapter13/01-BubbleSort.html b/examples/chapter13/01-BubbleSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-BubbleSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-BubbleSort.js b/examples/chapter13/01-BubbleSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-BubbleSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter13/01-BucketSort.html b/examples/chapter13/01-BucketSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-BucketSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-BucketSort.js b/examples/chapter13/01-BucketSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-BucketSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter13/01-CountingSort.html b/examples/chapter13/01-CountingSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-CountingSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-CountingSort.js b/examples/chapter13/01-CountingSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-CountingSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter13/01-InsertionSort.html b/examples/chapter13/01-InsertionSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-InsertionSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-InsertionSort.js b/examples/chapter13/01-InsertionSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-InsertionSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter13/01-MergeSort.html b/examples/chapter13/01-MergeSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-MergeSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-MergeSort.js b/examples/chapter13/01-MergeSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-MergeSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter13/01-QuickSort.html b/examples/chapter13/01-QuickSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-QuickSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-QuickSort.js b/examples/chapter13/01-QuickSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-QuickSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter13/01-RadixSort.html b/examples/chapter13/01-RadixSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-RadixSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-RadixSort.js b/examples/chapter13/01-RadixSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-RadixSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter13/01-SelectionSort.html b/examples/chapter13/01-SelectionSort.html new file mode 100644 index 00000000..88d9a1da --- /dev/null +++ b/examples/chapter13/01-SelectionSort.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter13/01-SelectionSort.js b/examples/chapter13/01-SelectionSort.js new file mode 100644 index 00000000..fff8970e --- /dev/null +++ b/examples/chapter13/01-SelectionSort.js @@ -0,0 +1,12 @@ +const { bubbleSort } = PacktDataStructuresAlgorithms; + +function createNonSortedArray(){ + var array = []; + for (let i = 5; i > 0; i--){ + array.push(i); + } + return array; +} + +const array = bubbleSort(createNonSortedArray()); +console.log(array); diff --git a/examples/chapter14/01-DC-BinarySearch.html b/examples/chapter14/01-DC-BinarySearch.html new file mode 100644 index 00000000..b110b636 --- /dev/null +++ b/examples/chapter14/01-DC-BinarySearch.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/01-DC-BinarySearch.js b/examples/chapter14/01-DC-BinarySearch.js new file mode 100644 index 00000000..e69de29b diff --git a/examples/chapter14/02-MinCoinChangeDP.html b/examples/chapter14/02-MinCoinChangeDP.html new file mode 100644 index 00000000..4c2027b3 --- /dev/null +++ b/examples/chapter14/02-MinCoinChangeDP.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/02-MinCoinChangeDP.js b/examples/chapter14/02-MinCoinChangeDP.js new file mode 100644 index 00000000..51ce7ed3 --- /dev/null +++ b/examples/chapter14/02-MinCoinChangeDP.js @@ -0,0 +1,5 @@ +const { minCoinChange } = PacktDataStructuresAlgorithms; + +console.log(minCoinChange([1, 5, 10], 15)); // [5, 10] +console.log(minCoinChange([1, 3, 4], 6)); // [3, 3] + diff --git a/examples/chapter14/03-MinCoinChangeGreedy.html b/examples/chapter14/03-MinCoinChangeGreedy.html new file mode 100644 index 00000000..92b0618f --- /dev/null +++ b/examples/chapter14/03-MinCoinChangeGreedy.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/03-MinCoinChangeGreedy.js b/examples/chapter14/03-MinCoinChangeGreedy.js new file mode 100644 index 00000000..584603f2 --- /dev/null +++ b/examples/chapter14/03-MinCoinChangeGreedy.js @@ -0,0 +1,5 @@ +const { minCoinChangeGreedy } = PacktDataStructuresAlgorithms; + +console.log(minCoinChangeGreedy([1, 5, 10], 15)); // [5, 10] +console.log(minCoinChangeGreedy([1, 3, 4], 6)); // [4, 1, 1] + diff --git a/examples/chapter14/04-KnapsackProblemDP.html b/examples/chapter14/04-KnapsackProblemDP.html new file mode 100644 index 00000000..1f06c983 --- /dev/null +++ b/examples/chapter14/04-KnapsackProblemDP.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/04-KnapsackProblemDP.js b/examples/chapter14/04-KnapsackProblemDP.js new file mode 100644 index 00000000..e9ff4369 --- /dev/null +++ b/examples/chapter14/04-KnapsackProblemDP.js @@ -0,0 +1,8 @@ +const { knapSack } = PacktDataStructuresAlgorithms; + +const values = [3,4,5]; +const weights = [2,3,4]; +const capacity = 5; +const n = values.length; + +console.log(knapSack(capacity, weights, values, n)); diff --git a/examples/chapter14/05-KnapSackProblemRecursive.html b/examples/chapter14/05-KnapSackProblemRecursive.html new file mode 100644 index 00000000..610d7310 --- /dev/null +++ b/examples/chapter14/05-KnapSackProblemRecursive.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/05-KnapSackProblemRecursive.js b/examples/chapter14/05-KnapSackProblemRecursive.js new file mode 100644 index 00000000..ba76971b --- /dev/null +++ b/examples/chapter14/05-KnapSackProblemRecursive.js @@ -0,0 +1,8 @@ +const { knapSackRecursive } = PacktDataStructuresAlgorithms; + +const values = [3,4,5]; +const weights = [2,3,4]; +const capacity = 5; +const n = values.length; + +console.log(knapSackRecursive(capacity, weights, values, n)); diff --git a/examples/chapter14/06-KnapSackProblemGreedy.html b/examples/chapter14/06-KnapSackProblemGreedy.html new file mode 100644 index 00000000..0d2e3c04 --- /dev/null +++ b/examples/chapter14/06-KnapSackProblemGreedy.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/06-KnapSackProblemGreedy.js b/examples/chapter14/06-KnapSackProblemGreedy.js new file mode 100644 index 00000000..d9858107 --- /dev/null +++ b/examples/chapter14/06-KnapSackProblemGreedy.js @@ -0,0 +1,7 @@ +const { knapSackGreedy } = PacktDataStructuresAlgorithms; + +const values = [3,4,5]; +const weights = [2,3,4]; +const capacity = 5; + +console.log(knapSackGreedy(capacity, weights, values)); diff --git a/examples/chapter14/07-LongestCommonSubsequenceDP.html b/examples/chapter14/07-LongestCommonSubsequenceDP.html new file mode 100644 index 00000000..f4b8b8a8 --- /dev/null +++ b/examples/chapter14/07-LongestCommonSubsequenceDP.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/07-LongestCommonSubsequenceDP.js b/examples/chapter14/07-LongestCommonSubsequenceDP.js new file mode 100644 index 00000000..75e86015 --- /dev/null +++ b/examples/chapter14/07-LongestCommonSubsequenceDP.js @@ -0,0 +1,8 @@ +const { lcs } = PacktDataStructuresAlgorithms; +const { lcsPrint } = PacktDataStructuresAlgorithms; + +const wordX = 'acbaed'; +const wordY = 'abcadf'; + +console.log('lcs', lcs(wordX, wordY)); +console.log('lcsPrint', lcsPrint(wordX, wordY)); diff --git a/examples/chapter14/08-LongestCommonSubsequenceRecursive.html b/examples/chapter14/08-LongestCommonSubsequenceRecursive.html new file mode 100644 index 00000000..25fa3a3f --- /dev/null +++ b/examples/chapter14/08-LongestCommonSubsequenceRecursive.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/08-LongestCommonSubsequenceRecursive.js b/examples/chapter14/08-LongestCommonSubsequenceRecursive.js new file mode 100644 index 00000000..63c2daf7 --- /dev/null +++ b/examples/chapter14/08-LongestCommonSubsequenceRecursive.js @@ -0,0 +1,6 @@ +const { lcsRecursive } = PacktDataStructuresAlgorithms; + +const wordX = 'acbaed'; +const wordY = 'abcadf'; + +console.log('lcsRecursive', lcsRecursive(wordX, wordY)); diff --git a/examples/chapter14/09-MatrixChainMultiplicationDP.html b/examples/chapter14/09-MatrixChainMultiplicationDP.html new file mode 100644 index 00000000..110165d7 --- /dev/null +++ b/examples/chapter14/09-MatrixChainMultiplicationDP.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/09-MatrixChainMultiplicationDP.js b/examples/chapter14/09-MatrixChainMultiplicationDP.js new file mode 100644 index 00000000..50e92fd5 --- /dev/null +++ b/examples/chapter14/09-MatrixChainMultiplicationDP.js @@ -0,0 +1,4 @@ +const { matrixChainOrder } = PacktDataStructuresAlgorithms; + +const p = [10, 100, 5, 50, 1]; +console.log(matrixChainOrder(p)); diff --git a/examples/chapter14/10-MatrixChainMultiplicationRecursive.html b/examples/chapter14/10-MatrixChainMultiplicationRecursive.html new file mode 100644 index 00000000..eba9ceaf --- /dev/null +++ b/examples/chapter14/10-MatrixChainMultiplicationRecursive.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/10-MatrixChainMultiplicationRecursive.js b/examples/chapter14/10-MatrixChainMultiplicationRecursive.js new file mode 100644 index 00000000..97245276 --- /dev/null +++ b/examples/chapter14/10-MatrixChainMultiplicationRecursive.js @@ -0,0 +1,4 @@ +const { matrixChainOrderGreedy } = PacktDataStructuresAlgorithms; + +const p = [10, 100, 5, 50, 1]; +console.log(matrixChainOrderGreedy(p)); diff --git a/examples/chapter14/11-RatInMaze.html b/examples/chapter14/11-RatInMaze.html new file mode 100644 index 00000000..da73582f --- /dev/null +++ b/examples/chapter14/11-RatInMaze.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/11-RatInMaze.js b/examples/chapter14/11-RatInMaze.js new file mode 100644 index 00000000..221e7f19 --- /dev/null +++ b/examples/chapter14/11-RatInMaze.js @@ -0,0 +1,10 @@ +const { ratInAMaze } = PacktDataStructuresAlgorithms; + +const maze = [ + [1, 0, 0, 0], + [1, 1, 1, 1], + [0, 0, 1, 0], + [0, 1, 1, 1] +]; + +console.log(ratInAMaze(maze)); diff --git a/examples/chapter14/12-SudokuSolver.html b/examples/chapter14/12-SudokuSolver.html new file mode 100644 index 00000000..b3126287 --- /dev/null +++ b/examples/chapter14/12-SudokuSolver.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/12-SudokuSolver.js b/examples/chapter14/12-SudokuSolver.js new file mode 100644 index 00000000..bf52ddf3 --- /dev/null +++ b/examples/chapter14/12-SudokuSolver.js @@ -0,0 +1,15 @@ +const { sudokuSolver } = PacktDataStructuresAlgorithms; + +const sudokuGrid = [ + [5, 3, 0, 0, 7, 0, 0, 0, 0], + [6, 0, 0, 1, 9, 5, 0, 0, 0], + [0, 9, 8, 0, 0, 0, 0, 6, 0], + [8, 0, 0, 0, 6, 0, 0, 0, 3], + [4, 0, 0, 8, 0, 3, 0, 0, 1], + [7, 0, 0, 0, 2, 0, 0, 0, 6], + [0, 6, 0, 0, 0, 0, 2, 8, 0], + [0, 0, 0, 4, 1, 9, 0, 0, 5], + [0, 0, 0, 0, 8, 0, 0, 7, 9] +]; + +console.log(sudokuSolver(sudokuGrid)); diff --git a/examples/chapter14/13-IntroFunctionalProgramming.html b/examples/chapter14/13-IntroFunctionalProgramming.html new file mode 100644 index 00000000..0d7cd0ed --- /dev/null +++ b/examples/chapter14/13-IntroFunctionalProgramming.html @@ -0,0 +1,11 @@ + + + + + + + + + + + diff --git a/examples/chapter14/13-IntroFunctionalProgramming.js b/examples/chapter14/13-IntroFunctionalProgramming.js new file mode 100644 index 00000000..692bebd6 --- /dev/null +++ b/examples/chapter14/13-IntroFunctionalProgramming.js @@ -0,0 +1,147 @@ +console.log('Using imperative JS'); + +var printArray = function(array){ + for (var i=0; i array[i]){ + minValue = array[i]; + } + } + + return minValue; +}; + +console.log(findMinArray([8,6,4,5,9])); + +console.log('Finding the min value in an array - functional ES2015'); +const min_ = function(array){ + return Math.min(...array) +}; + +//simplifying using arrow functions +const min = arr => Math.min(...arr); + +console.log(min_([8,6,4,5,9])); +console.log(min([8,6,4,5,9])); + +//concat + reduce +console.log('merge arrays - imperative'); + +var mergeArrays_ = function(arrays){ + var count = arrays.length, + newArray = [], + k =0; + for (var i=0; i [].concat(...arrays); +console.log(mergeArrays([1, 2, 3], [4, 5], [6])); + +console.log('sum values of arrays - imperative'); +var sumValues = function(array){ + var total = array[0]; + for (var i=1; i arr.reduce((a, b) => a + b); + +console.log(sum([1, 2, 3, 4, 5])); + +//map +var daysOfWeek = [ + {name: 'Monday', value: 1}, + {name: 'Tuesday', value: 2}, + {name: 'Wednesday', value: 7} +]; + +var daysOfWeekValues_ = []; +for (var i = 0; i < daysOfWeek.length; i++) { + daysOfWeekValues_.push(daysOfWeek[i].value); +} + +//to +var daysOfWeekValues = daysOfWeek.map(function(day) { + return day.value; +}); +console.log(daysOfWeekValues); + + +//filter +var positiveNumbers_ = function(array){ + var positive = []; + for (var i = 0; i < array.length; i++) { + if (array[i] >= 0){ + positive.push(array[i]); + } + } + return positive; +} +console.log(positiveNumbers_([-1,1,2,-2])); + +var positiveNumbers = function(array){ + return array.filter(function(num){ + return num >= 0; + }) +}; +console.log(positiveNumbers([-1,1,2,-2])); diff --git a/examples/chapter15/01-BigONotation.html b/examples/chapter15/01-BigONotation.html new file mode 100755 index 00000000..f8f26334 --- /dev/null +++ b/examples/chapter15/01-BigONotation.html @@ -0,0 +1,10 @@ + + + + + + + + + + diff --git a/examples/chapter15/01-BigONotation.js b/examples/chapter15/01-BigONotation.js new file mode 100755 index 00000000..a48bd6ab --- /dev/null +++ b/examples/chapter15/01-BigONotation.js @@ -0,0 +1,65 @@ +//*************** o(1) +function increment(num){ + console.log('cost for increment with input ' + num + ' is 1'); + return ++num; +} + +increment(1); +increment(2); + +//*************** o(n) + +function createNonSortedArray(size){ + var array = []; + + for (var i = size; i> 0; i--){ + array[i] = i; + } + + return array; +} + +function sequentialSearch(array, item){ + var cost = 0; + for (var i=0; i array[j+1]){ + swap(array, j, j+1); + } + } + } + console.log('cost for bubbleSort with input size ' + length + ' is ' + cost); +} + +var array1 = createNonSortedArray(99); +var array2 = createNonSortedArray(999); +var array3 = createNonSortedArray(9999); +bubbleSort(array1); +bubbleSort(array2); +bubbleSort(array3); \ No newline at end of file diff --git a/examples/chapter15/bigOChart/chart.js b/examples/chapter15/bigOChart/chart.js new file mode 100755 index 00000000..765794df --- /dev/null +++ b/examples/chapter15/bigOChart/chart.js @@ -0,0 +1,37 @@ +google.load('visualization', '1.0', {'packages':['corechart']}); +google.setOnLoadCallback(drawChart); + +function drawChart() { + + var data = new google.visualization.DataTable(); + data.addColumn('string', 'n'); + data.addColumn('number', 'O(1)'); + data.addColumn('number', 'O(log n)'); + data.addColumn('number', 'O(n)'); + data.addColumn('number', 'O(n log n)'); + data.addColumn('number', 'O(n^2)'); + data.addColumn('number', 'O(2^n)'); + + for (var i = 0; i <= 30; i++) { + data.addRow([i+'', 1, Math.log(i), i, Math.log(i)*i, Math.pow(i,2), Math.pow(2,i)]); + } + + var options = {'title':'Big O Notation Complexity Chart', + 'width':700, + 'height':600, + 'backgroundColor':{stroke:'#CCC',strokeWidth:1}, + 'curveType':'function', + 'hAxis':{ + title:'Elements (n)', + showTextEvery:5 + }, + 'vAxis':{ + title:'Operations', + viewWindowMode:'explicit', + viewWindow:{min:0,max:450} + } + }; + + var chart = new google.visualization.LineChart(document.getElementById('chart_div')); + chart.draw(data, options); +} \ No newline at end of file diff --git a/examples/chapter15/bigOChart/index.html b/examples/chapter15/bigOChart/index.html new file mode 100755 index 00000000..31118263 --- /dev/null +++ b/examples/chapter15/bigOChart/index.html @@ -0,0 +1,14 @@ + + + + + + + + + +
+ + \ No newline at end of file diff --git a/examples/examples-screenshot.png b/examples/examples-screenshot.png new file mode 100644 index 00000000..a264d142 Binary files /dev/null and b/examples/examples-screenshot.png differ diff --git a/examples/index.html b/examples/index.html index 81003bd3..7e3e6629 100644 --- a/examples/index.html +++ b/examples/index.html @@ -3,7 +3,7 @@ - DataStructures and Algorithms with JavaScript + Data Structures and Algorithms with JavaScript @@ -13,12 +13,15 @@ .mdl-layout__content { padding: 10px; } + .mdl-layout__drawer { width: 290px; } + .iframe-padding { padding-left: 295px; } + .mdl-layout__drawer .mdl-navigation .mdl-navigation__link { color: rgb(103, 58, 183); } @@ -35,83 +38,255 @@
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+ } + } + }, + "yargs-parser": { + "version": "8.1.0", + "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-8.1.0.tgz", + "integrity": "sha512-yP+6QqN8BmrgW2ggLtTbdrOyBNSI7zBa4IykmiV5R1wl1JWNxQvWhMfMdmzIYtKU7oP3OOInY/tl2ov3BDjnJQ==", + "dev": true, + "requires": { + "camelcase": "^4.1.0" + } + }, + "yn": { + "version": "3.1.1", + "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz", + "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==", + "dev": true + } + } +} diff --git a/package.json b/package.json index e4362713..db66f5b6 100644 --- a/package.json +++ b/package.json @@ -1,6 +1,6 @@ { "name": "javascript-datastructures-algorithms", - "version": "1.0.0", + "version": "0.0.1", "description": "Learning JavaScript Data Structures and Algorithms", "repository": { "type": "git", @@ -21,14 +21,18 @@ "lint:js": "eslint src/js && eslint test/js", "lint:ts": "tslint -c tslint.json 'src/ts/**/*.ts' && tslint -c tslint.json 'test/ts/**/*.ts'", "lint": "npm run lint:js && npm run lint:ts", - "test:js": "mocha --compilers js:babel-core/register ./test/js/**/*.spec.js --reporter mochawesome", - "test:ts": "mocha -r ts-node/register --recursive ./test/ts/**/*.spec.ts", + "eslintFix": "eslint src/js --fix && eslint test/js --fix", + "test:js": "mocha --compilers js:babel-core/register ./test/js --recursive --reporter mochawesome", + "test:ts": "mocha -r ts-node/register ./test/ts/**/*.spec.ts ./test/ts/**/**/*.spec.ts --recursive", "test": "npm run test:js && npm run test:ts", "dev": "npm run clean && npm run lint && npm run webpack && npm run generate-report", + "dev2": "npm run clean && npm run lint && npm run webpack && npm run generate-report2", "coverage": "npm run generate-report && nyc report --reporter=text-lcov > coverage.lcov && codecov", "generate-report": "nyc --report-dir coverage npm run test && nyc report --reporter=text", + "generate-report2": "nyc --report-dir coverage npm run test", "go": "npm run clean && npm run lint && npm run build && npm run test", - "webpack": "webpack --env build" + "webpack": "webpack --env build", + "serve": "http-server -c-1" }, "nyc": { "include": [ @@ -51,28 +55,32 @@ "all": true }, "devDependencies": { - "@types/chai": "^4.0.4", - "@types/mocha": "^2.2.42", + "@types/chai": "^4.1.2", + "@types/mocha": "^5.0.0", "babel-cli": "^6.26.0", - "babel-core": "^6.26.0", - "babel-eslint": "^8.0.0", - "babel-loader": "^7.1.2", - "babel-plugin-add-module-exports": "^0.2.1", + "babel-core": "^6.26.3", + "babel-eslint": "^10.0.1", + "babel-loader": "^8.0.5", + "babel-plugin-add-module-exports": "^1.0.0", "babel-plugin-transform-es2015-modules-umd": "^6.24.1", - "babel-preset-env": "^1.6.0", + "babel-preset-env": "^1.7.0", "chai": "^4.1.2", - "codecov": "^2.3.0", - "eslint": "^4.6.1", - "eslint-config-airbnb-base": "^12.0.0", - "eslint-plugin-import": "^2.7.0", + "codecov": "^3.7.1", + "eslint": "^5.15.1", + "eslint-config-airbnb-base": "^13.1.0", + "eslint-plugin-import": "^2.16.0", "istanbul": "^v1.1.0-alpha.1", - "mocha": "^3.5.0", - "mochawesome": "^2.3.1", - "nyc": "^11.2.1", - "ts-node": "^3.3.0", - "tslint": "^5.7.0", - "typescript": "^2.5.2", - "webpack": "^3.6.0", - "yargs": "^9.0.1" + "mocha": "^5.0.4", + "mochawesome": "^3.0.2", + "nyc": "11.7.2", + "ts-node": "8.0.3", + "tslint": "5.14.0", + "typescript": "3.3.3333", + "webpack": "^4.29.6", + "webpack-cli": "3.3.0", + "yargs": "^16.1.0" + }, + "dependencies": { + "http-server": "^0.12.3" } } diff --git a/src/js/algorithms/backtracking/rat-in-maze.js b/src/js/algorithms/backtracking/rat-in-maze.js new file mode 100644 index 00000000..ff433130 --- /dev/null +++ b/src/js/algorithms/backtracking/rat-in-maze.js @@ -0,0 +1,41 @@ +function isSafe(maze, x, y) { + const n = maze.length; + if (x >= 0 && y >= 0 && x < n && y < n && maze[x][y] !== 0) { + return true; + } + return false; +} + +function findPath(maze, x, y, solution) { + const n = maze.length; + if (x === n - 1 && y === n - 1) { + solution[x][y] = 1; + return true; + } + if (isSafe(maze, x, y) === true) { + solution[x][y] = 1; + if (findPath(maze, x + 1, y, solution)) { + return true; + } + if (findPath(maze, x, y + 1, solution)) { + return true; + } + solution[x][y] = 0; + return false; + } + return false; +} + +export function ratInAMaze(maze) { + const solution = []; + for (let i = 0; i < maze.length; i++) { + solution[i] = []; + for (let j = 0; j < maze[i].length; j++) { + solution[i][j] = 0; + } + } + if (findPath(maze, 0, 0, solution) === true) { + return solution; + } + return 'NO PATH FOUND'; +} diff --git a/src/js/algorithms/backtracking/sudoku-solver.js b/src/js/algorithms/backtracking/sudoku-solver.js new file mode 100644 index 00000000..6e1a76fc --- /dev/null +++ b/src/js/algorithms/backtracking/sudoku-solver.js @@ -0,0 +1,76 @@ +const UNASSIGNED = 0; + +function usedInRow(matrix, row, num) { + for (let col = 0; col < matrix.length; col++) { + if (matrix[row][col] === num) { + return true; + } + } + return false; +} + +function usedInCol(matrix, col, num) { + for (let row = 0; row < matrix.length; row++) { + if (matrix[row][col] === num) { + return true; + } + } + return false; +} + +function usedInBox(matrix, boxStartRow, boxStartCol, num) { + for (let row = 0; row < 3; row++) { + for (let col = 0; col < 3; col++) { + if (matrix[row + boxStartRow][col + boxStartCol] === num) { + return true; + } + } + } + return false; +} + +function isSafe(matrix, row, col, num) { + return ( + !usedInRow(matrix, row, num) + && !usedInCol(matrix, col, num) + && !usedInBox(matrix, row - (row % 3), col - (col % 3), num) + ); +} +function solveSudoku(matrix) { + let row = 0; + let col = 0; + let checkBlankSpaces = false; + + for (row = 0; row < matrix.length; row++) { + for (col = 0; col < matrix[row].length; col++) { + if (matrix[row][col] === UNASSIGNED) { + checkBlankSpaces = true; + break; + } + } + if (checkBlankSpaces === true) { + break; + } + } + if (checkBlankSpaces === false) { + return true; + } + + for (let num = 1; num <= 9; num++) { + if (isSafe(matrix, row, col, num)) { + matrix[row][col] = num; + if (solveSudoku(matrix)) { + return true; + } + matrix[row][col] = UNASSIGNED; + } + } + return false; +} + +export function sudokuSolver(matrix) { + if (solveSudoku(matrix) === true) { + return matrix; + } + return 'NO SOLUTION EXISTS!'; +} diff --git a/src/js/algorithms/dynamic-programing/knapsack-recursive.js b/src/js/algorithms/dynamic-programing/knapsack-recursive.js new file mode 100644 index 00000000..fbe646e1 --- /dev/null +++ b/src/js/algorithms/dynamic-programing/knapsack-recursive.js @@ -0,0 +1,11 @@ +export function knapSack(capacity, weights, values, n) { + if (n === 0 || capacity === 0) { + return 0; + } + if (weights[n - 1] > capacity) { + return knapSack(capacity, weights, values, n - 1); + } + const a = values[n - 1] + knapSack(capacity - weights[n - 1], weights, values, n - 1); + const b = knapSack(capacity, weights, values, n - 1); + return a > b ? a : b; +} diff --git a/src/js/algorithms/dynamic-programing/knapsack.js b/src/js/algorithms/dynamic-programing/knapsack.js new file mode 100644 index 00000000..9c979360 --- /dev/null +++ b/src/js/algorithms/dynamic-programing/knapsack.js @@ -0,0 +1,41 @@ +function findValues(n, capacity, kS) { + let i = n; + let k = capacity; + // console.log('Items that are part of the solution:'); + while (i > 0 && k > 0) { + if (kS[i][k] !== kS[i - 1][k]) { + // console.log( + // item ' + i + ' can be part of solution w,v: ' + weights[i - 1] + ',' + values[i - 1] + // ); + i--; + k -= kS[i][k]; + } else { + i--; + } + } +} + +export function knapSack(capacity, weights, values, n) { + const kS = []; + for (let i = 0; i <= n; i++) { + kS[i] = []; + } + for (let i = 0; i <= n; i++) { + for (let w = 0; w <= capacity; w++) { + if (i === 0 || w === 0) { + kS[i][w] = 0; + } else if (weights[i - 1] <= w) { + const a = values[i - 1] + kS[i - 1][w - weights[i - 1]]; + const b = kS[i - 1][w]; + kS[i][w] = a > b ? a : b; // max(a,b) + // console.log(a + ' can be part of the solution'); + } else { + kS[i][w] = kS[i - 1][w]; + } + } + // console.log(kS[i].join()); + } + // extra algorithm to find the items that are part of the solution + findValues(n, capacity, kS); + return kS[n][capacity]; +} diff --git a/src/js/algorithms/dynamic-programing/longest-common-subsequence-print.js b/src/js/algorithms/dynamic-programing/longest-common-subsequence-print.js new file mode 100644 index 00000000..e18c6e11 --- /dev/null +++ b/src/js/algorithms/dynamic-programing/longest-common-subsequence-print.js @@ -0,0 +1,51 @@ +function printSolution(solution, wordX, m, n) { + let a = m; + let b = n; + let x = solution[a][b]; + let answer = ''; + while (x !== '0') { + if (solution[a][b] === 'diagonal') { + answer = wordX[a - 1] + answer; + a--; + b--; + } else if (solution[a][b] === 'left') { + b--; + } else if (solution[a][b] === 'top') { + a--; + } + x = solution[a][b]; + } + return answer; +} +export function lcs(wordX, wordY) { + const m = wordX.length; + const n = wordY.length; + const l = []; + const solution = []; + for (let i = 0; i <= m; i++) { + l[i] = []; + solution[i] = []; + for (let j = 0; j <= n; j++) { + l[i][j] = 0; + solution[i][j] = '0'; + } + } + for (let i = 0; i <= m; i++) { + for (let j = 0; j <= n; j++) { + if (i === 0 || j === 0) { + l[i][j] = 0; + } else if (wordX[i - 1] === wordY[j - 1]) { + l[i][j] = l[i - 1][j - 1] + 1; + solution[i][j] = 'diagonal'; + } else { + const a = l[i - 1][j]; + const b = l[i][j - 1]; + l[i][j] = a > b ? a : b; // max(a,b) + solution[i][j] = l[i][j] === l[i - 1][j] ? 'top' : 'left'; + } + } + // console.log(l[i].join()); + // console.log(solution[i].join()); + } + return printSolution(solution, wordX, m, n); +} diff --git a/src/js/algorithms/dynamic-programing/longest-common-subsequence.js b/src/js/algorithms/dynamic-programing/longest-common-subsequence.js new file mode 100644 index 00000000..762c70c6 --- /dev/null +++ b/src/js/algorithms/dynamic-programing/longest-common-subsequence.js @@ -0,0 +1,26 @@ +export function lcs(wordX, wordY) { + const m = wordX.length; + const n = wordY.length; + const l = []; + for (let i = 0; i <= m; i++) { + l[i] = []; + for (let j = 0; j <= n; j++) { + l[i][j] = 0; + } + } + for (let i = 0; i <= m; i++) { + for (let j = 0; j <= n; j++) { + if (i === 0 || j === 0) { + l[i][j] = 0; + } else if (wordX[i - 1] === wordY[j - 1]) { + l[i][j] = l[i - 1][j - 1] + 1; + } else { + const a = l[i - 1][j]; + const b = l[i][j - 1]; + l[i][j] = a > b ? a : b; // max(a,b) + } + } + // console.log(l[i].join()); + } + return l[m][n]; +} diff --git a/src/js/algorithms/dynamic-programing/matrix-chain-multiplication.js b/src/js/algorithms/dynamic-programing/matrix-chain-multiplication.js new file mode 100644 index 00000000..143f5772 --- /dev/null +++ b/src/js/algorithms/dynamic-programing/matrix-chain-multiplication.js @@ -0,0 +1,45 @@ +function printOptimalParenthesis(s, i, j) { + if (i === j) { + // console.log('A[' + i + ']'); + } else { + // console.log('('); + printOptimalParenthesis(s, i, s[i][j]); + printOptimalParenthesis(s, s[i][j] + 1, j); + // console.log(')'); + } +} + +export function matrixChainOrder(p) { + const n = p.length; + const m = []; + const s = []; + for (let i = 1; i <= n; i++) { + m[i] = []; + m[i][i] = 0; + } + for (let i = 0; i <= n; i++) { + // to help printing the optimal solution + s[i] = []; // auxiliary + for (let j = 0; j <= n; j++) { + s[i][j] = 0; + } + } + for (let l = 2; l < n; l++) { + for (let i = 1; i <= (n - l) + 1; i++) { + const j = (i + l) - 1; + m[i][j] = Number.MAX_SAFE_INTEGER; + for (let k = i; k <= j - 1; k++) { + // q = cost/scalar multiplications + const q = m[i][k] + m[k + 1][j] + ((p[i - 1] * p[k]) * p[j]); + if (q < m[i][j]) { + m[i][j] = q; + s[i][j] = k; // s[i,j] = Second auxiliary table that stores k + } + } + } + } + // console.log(m); + // console.log(s); + printOptimalParenthesis(s, 1, n - 1); + return m[1][n - 1]; +} diff --git a/src/js/algorithms/dynamic-programing/min-coin-change.js b/src/js/algorithms/dynamic-programing/min-coin-change.js new file mode 100644 index 00000000..a477c804 --- /dev/null +++ b/src/js/algorithms/dynamic-programing/min-coin-change.js @@ -0,0 +1,32 @@ +export function minCoinChange(coins, amount) { + const cache = []; + + const makeChange = (value) => { + if (!value) { + return []; + } + if (cache[value]) { + return cache[value]; + } + let min = []; + let newMin; + let newAmount; + for (let i = 0; i < coins.length; i++) { + const coin = coins[i]; + newAmount = value - coin; + if (newAmount >= 0) { + newMin = makeChange(newAmount); + } + if ( + newAmount >= 0 + && (newMin.length < min.length - 1 || !min.length) + && (newMin.length || !newAmount) + ) { + min = [coin].concat(newMin); + // console.log('new Min ' + min + ' for ' + amount); + } + } + return (cache[value] = min); + }; + return makeChange(amount); +} diff --git a/src/js/algorithms/graph/breadth-first-search.js b/src/js/algorithms/graph/breadth-first-search.js new file mode 100644 index 00000000..7cf3f395 --- /dev/null +++ b/src/js/algorithms/graph/breadth-first-search.js @@ -0,0 +1,74 @@ +import Queue from '../../data-structures/queue'; + +const Colors = { + WHITE: 0, + GREY: 1, + BLACK: 2 +}; + +const initializeColor = vertices => { + const color = {}; + for (let i = 0; i < vertices.length; i++) { + color[vertices[i]] = Colors.WHITE; + } + return color; +}; + +export const breadthFirstSearch = (graph, startVertex, callback) => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + const queue = new Queue(); + + queue.enqueue(startVertex); + + while (!queue.isEmpty()) { + const u = queue.dequeue(); + const neighbors = adjList.get(u); + color[u] = Colors.GREY; + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + color[w] = Colors.GREY; + queue.enqueue(w); + } + } + color[u] = Colors.BLACK; + if (callback) { + callback(u); + } + } +}; + +export const BFS = (graph, startVertex) => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + const queue = new Queue(); + const distances = {}; + const predecessors = {}; + queue.enqueue(startVertex); + for (let i = 0; i < vertices.length; i++) { + distances[vertices[i]] = 0; + predecessors[vertices[i]] = null; + } + while (!queue.isEmpty()) { + const u = queue.dequeue(); + const neighbors = adjList.get(u); + color[u] = Colors.GREY; + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + color[w] = Colors.GREY; + distances[w] = distances[u] + 1; + predecessors[w] = u; + queue.enqueue(w); + } + } + color[u] = Colors.BLACK; + } + return { + distances, + predecessors + }; +}; diff --git a/src/js/algorithms/graph/depth-first-search.js b/src/js/algorithms/graph/depth-first-search.js new file mode 100644 index 00000000..8427659f --- /dev/null +++ b/src/js/algorithms/graph/depth-first-search.js @@ -0,0 +1,86 @@ +// import Graph from '../../data-structures/graph'; + +const Colors = { + WHITE: 0, + GREY: 1, + BLACK: 2 +}; + +const initializeColor = vertices => { + const color = {}; + for (let i = 0; i < vertices.length; i++) { + color[vertices[i]] = Colors.WHITE; + } + return color; +}; + +const depthFirstSearchVisit = (u, color, adjList, callback) => { + color[u] = Colors.GREY; + if (callback) { + callback(u); + } + // console.log('Discovered ' + u); + const neighbors = adjList.get(u); + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + depthFirstSearchVisit(w, color, adjList, callback); + } + } + color[u] = Colors.BLACK; + // console.log('explored ' + u); +}; + +export const depthFirstSearch = (graph, callback) => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + + for (let i = 0; i < vertices.length; i++) { + if (color[vertices[i]] === Colors.WHITE) { + depthFirstSearchVisit(vertices[i], color, adjList, callback); + } + } +}; + +const DFSVisit = (u, color, d, f, p, time, adjList) => { + // console.log('discovered ' + u); + color[u] = Colors.GREY; + d[u] = ++time.count; + const neighbors = adjList.get(u); + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + p[w] = u; + DFSVisit(w, color, d, f, p, time, adjList); + } + } + color[u] = Colors.BLACK; + f[u] = ++time.count; + // console.log('explored ' + u); +}; + +export const DFS = graph => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + const d = {}; + const f = {}; + const p = {}; + const time = { count: 0 }; + for (let i = 0; i < vertices.length; i++) { + f[vertices[i]] = 0; + d[vertices[i]] = 0; + p[vertices[i]] = null; + } + for (let i = 0; i < vertices.length; i++) { + if (color[vertices[i]] === Colors.WHITE) { + DFSVisit(vertices[i], color, d, f, p, time, adjList); + } + } + return { + discovery: d, + finished: f, + predecessors: p + }; +}; diff --git a/src/js/algorithms/graph/dijkstra.js b/src/js/algorithms/graph/dijkstra.js new file mode 100644 index 00000000..ec223687 --- /dev/null +++ b/src/js/algorithms/graph/dijkstra.js @@ -0,0 +1,32 @@ +const INF = Number.MAX_SAFE_INTEGER; +const minDistance = (dist, visited) => { + let min = INF; + let minIndex = -1; + for (let v = 0; v < dist.length; v++) { + if (visited[v] === false && dist[v] <= min) { + min = dist[v]; + minIndex = v; + } + } + return minIndex; +}; +export const dijkstra = (graph, src) => { + const dist = []; + const visited = []; + const { length } = graph; + for (let i = 0; i < length; i++) { + dist[i] = INF; + visited[i] = false; + } + dist[src] = 0; + for (let i = 0; i < length - 1; i++) { + const u = minDistance(dist, visited); + visited[u] = true; + for (let v = 0; v < length; v++) { + if (!visited[v] && graph[u][v] !== 0 && dist[u] !== INF && dist[u] + graph[u][v] < dist[v]) { + dist[v] = dist[u] + graph[u][v]; + } + } + } + return dist; +}; diff --git a/src/js/algorithms/graph/floyd-warshall.js b/src/js/algorithms/graph/floyd-warshall.js new file mode 100644 index 00000000..d8bb875e --- /dev/null +++ b/src/js/algorithms/graph/floyd-warshall.js @@ -0,0 +1,26 @@ +export const floydWarshall = graph => { + const dist = []; + const { length } = graph; + for (let i = 0; i < length; i++) { + dist[i] = []; + for (let j = 0; j < length; j++) { + if (i === j) { + dist[i][j] = 0; + } else if (!isFinite(graph[i][j])) { + dist[i][j] = Infinity; + } else { + dist[i][j] = graph[i][j]; + } + } + } + for (let k = 0; k < length; k++) { + for (let i = 0; i < length; i++) { + for (let j = 0; j < length; j++) { + if (dist[i][k] + dist[k][j] < dist[i][j]) { + dist[i][j] = dist[i][k] + dist[k][j]; + } + } + } + } + return dist; +}; diff --git a/src/js/algorithms/graph/gale-shapley.js b/src/js/algorithms/graph/gale-shapley.js new file mode 100644 index 00000000..b0d52689 --- /dev/null +++ b/src/js/algorithms/graph/gale-shapley.js @@ -0,0 +1,77 @@ +class Person { + constructor(id, gender, ranks, rankIndex, status = "single") { + this.id = id + this.gender = gender + this.ranks = ranks + this.i = rankIndex + this.status = status + this.partner = null + } +} + +function galeShapley(proposers, reviewers) { + let perfectMatching = new Map() + for (let [pid, p] of proposers) { + while (p.i < p.ranks.length) { + let rid = p.ranks[p.i] + let r = reviewers.get(rid) + p.i++ + if (r.status === "single") { + r.status = "engaged" + r.partner = p + p.partner = r + perfectMatching.set(pid, rid) + proposers.delete(pid) + break + } else if (r.status === "engaged" && r.ranks.get(pid) < r.ranks.get(r.partner.id)) { + perfectMatching.delete(r.partner.id) + proposers.set(r.partner.id, r.partner) + proposers.delete(pid) + r.partner.partner = null + r.partner = p + p.partner = r + perfectMatching.set(pid, rid) + break + } + } + } + return perfectMatching +} + +let men = new Map() +let women = new Map() +//O(n^2) +function createPeople(n, gender, set) { + for (let i = 0; i < n; i++) { + let id = i + let rankIndex = 0 + let g = gender + let ranks = new Array(n) + let p + for (let i = 0; i < n; i++) ranks[i] = i + shuffle(ranks) + if (gender == 'w') { + let wRanks = new Map() + for (let i = 0; i < n; i++) wRanks.set(i, ranks[i]) + p = new Person(id, g, wRanks, null) + } else { + p = new Person(id, g, ranks, rankIndex) + } + set.set(i, p) + } +} + +//fisher-yates shuffle O(n) +function shuffle(array) { + for (let i = array.length - 1; i >= 0; i--) { + let j = Math.floor(Math.random() * (i + 1)) + let temp = array[i] + array[i] = array[j] + array[j] = temp + } +} + +createPeople(4, 'm', men) +createPeople(4, 'w', women) +let stableMatching = galeShapley(men, women) +console.log(stableMatching) diff --git a/src/js/algorithms/graph/kruskal.js b/src/js/algorithms/graph/kruskal.js new file mode 100644 index 00000000..d1435c28 --- /dev/null +++ b/src/js/algorithms/graph/kruskal.js @@ -0,0 +1,57 @@ +const INF = Number.MAX_SAFE_INTEGER; +const find = (i, parent) => { + while (parent[i]) { + i = parent[i]; // eslint-disable-line prefer-destructuring + } + return i; +}; +const union = (i, j, parent) => { + if (i !== j) { + parent[j] = i; + return true; + } + return false; +}; +const initializeCost = graph => { + const cost = []; + const { length } = graph; + for (let i = 0; i < length; i++) { + cost[i] = []; + for (let j = 0; j < length; j++) { + if (graph[i][j] === 0) { + cost[i][j] = INF; + } else { + cost[i][j] = graph[i][j]; + } + } + } + return cost; +}; +export const kruskal = graph => { + const { length } = graph; + const parent = []; + let ne = 0; + let a; + let b; + let u; + let v; + const cost = initializeCost(graph); + while (ne < length - 1) { + for (let i = 0, min = INF; i < length; i++) { + for (let j = 0; j < length; j++) { + if (cost[i][j] < min) { + min = cost[i][j]; + a = u = i; + b = v = j; + } + } + } + u = find(u, parent); + v = find(v, parent); + if (union(u, v, parent)) { + ne++; + } + cost[a][b] = cost[b][a] = INF; + } + return parent; +}; diff --git a/src/js/algorithms/graph/prim.js b/src/js/algorithms/graph/prim.js new file mode 100644 index 00000000..bbb54e95 --- /dev/null +++ b/src/js/algorithms/graph/prim.js @@ -0,0 +1,36 @@ +const INF = Number.MAX_SAFE_INTEGER; +const minKey = (graph, key, visited) => { + // Initialize min value + let min = INF; + let minIndex = 0; + for (let v = 0; v < graph.length; v++) { + if (visited[v] === false && key[v] < min) { + min = key[v]; + minIndex = v; + } + } + return minIndex; +}; +export const prim = graph => { + const parent = []; + const key = []; + const visited = []; + const { length } = graph; + for (let i = 0; i < length; i++) { + key[i] = INF; + visited[i] = false; + } + key[0] = 0; + parent[0] = -1; + for (let i = 0; i < length - 1; i++) { + const u = minKey(graph, key, visited); + visited[u] = true; + for (let v = 0; v < length; v++) { + if (graph[u][v] && !visited[v] && graph[u][v] < key[v]) { + parent[v] = u; + key[v] = graph[u][v]; + } + } + } + return parent; +}; diff --git a/src/js/algorithms/greedy/knapsack.js b/src/js/algorithms/greedy/knapsack.js new file mode 100644 index 00000000..294def52 --- /dev/null +++ b/src/js/algorithms/greedy/knapsack.js @@ -0,0 +1,18 @@ +export function knapSack(capacity, weights, values) { + const n = values.length; + let load = 0; + let val = 0; + for (let i = 0; i < n && load < capacity; i++) { + if (weights[i] <= capacity - load) { + val += values[i]; + load += weights[i]; + // console.log('using item ' + (i + 1) + ' for the solution'); + } else { + const r = (capacity - load) / weights[i]; + val += r * values[i]; + load += weights[i]; + // console.log('using ratio of ' + r + ' for item ' + (i + 1) + ' for the solution'); + } + } + return val; +} diff --git a/src/js/algorithms/greedy/longest-common-subsequence.js b/src/js/algorithms/greedy/longest-common-subsequence.js new file mode 100644 index 00000000..f7ec8272 --- /dev/null +++ b/src/js/algorithms/greedy/longest-common-subsequence.js @@ -0,0 +1,11 @@ +export function lcs(wordX, wordY, m = wordX.length, n = wordY.length) { + if (m === 0 || n === 0) { + return 0; + } + if (wordX[m - 1] === wordY[n - 1]) { + return 1 + lcs(wordX, wordY, m - 1, n - 1); + } + const a = lcs(wordX, wordY, m, n - 1); + const b = lcs(wordX, wordY, m - 1, n); + return a > b ? a : b; +} diff --git a/src/js/algorithms/greedy/matrix-chain-multiplication.js b/src/js/algorithms/greedy/matrix-chain-multiplication.js new file mode 100644 index 00000000..63c5b4ae --- /dev/null +++ b/src/js/algorithms/greedy/matrix-chain-multiplication.js @@ -0,0 +1,14 @@ +export function matrixChainOrder(p, i = 1, j = p.length - 1) { + if (i === j) { + return 0; + } + let min = Number.MAX_SAFE_INTEGER; + for (let k = i; k < j; k++) { + const count = matrixChainOrder(p, i, k) + + matrixChainOrder(p, k + 1, j) + ((p[i - 1] * p[k]) * p[j]); + if (count < min) { + min = count; + } + } + return min; +} diff --git a/src/js/algorithms/greedy/min-coin-change.js b/src/js/algorithms/greedy/min-coin-change.js new file mode 100644 index 00000000..61abfe91 --- /dev/null +++ b/src/js/algorithms/greedy/min-coin-change.js @@ -0,0 +1,12 @@ +export function minCoinChange(coins, amount) { + const change = []; + let total = 0; + for (let i = coins.length; i >= 0; i--) { + const coin = coins[i]; + while (total + coin <= amount) { + change.push(coin); + total += coin; + } + } + return change; +} diff --git a/src/js/algorithms/search/binary-search-recursive.js b/src/js/algorithms/search/binary-search-recursive.js new file mode 100644 index 00000000..d8daa439 --- /dev/null +++ b/src/js/algorithms/search/binary-search-recursive.js @@ -0,0 +1,24 @@ +import { Compare, defaultCompare, DOES_NOT_EXIST } from '../../util'; +import { quickSort } from '../sorting/quicksort'; + +function binarySearchRecursive(array, value, low, high, compareFn = defaultCompare) { + if (low <= high) { + const mid = Math.floor((low + high) / 2); + const element = array[mid]; + if (compareFn(element, value) === Compare.LESS_THAN) { + return binarySearchRecursive(array, value, mid + 1, high, compareFn); + } + if (compareFn(element, value) === Compare.BIGGER_THAN) { + return binarySearchRecursive(array, value, low, mid - 1, compareFn); + } + return mid; + } + return DOES_NOT_EXIST; +} + +export function binarySearch(array, value, compareFn = defaultCompare) { + const sortedArray = quickSort(array); + const low = 0; + const high = sortedArray.length - 1; + return binarySearchRecursive(array, value, low, high, compareFn); +} diff --git a/src/js/algorithms/search/binary-search.js b/src/js/algorithms/search/binary-search.js new file mode 100644 index 00000000..0c2f9fba --- /dev/null +++ b/src/js/algorithms/search/binary-search.js @@ -0,0 +1,24 @@ +import { Compare, defaultCompare, DOES_NOT_EXIST } from '../../util'; +import { quickSort } from '../sorting/quicksort'; + +export function binarySearch(array, value, compareFn = defaultCompare) { + const sortedArray = quickSort(array); + let low = 0; + let high = sortedArray.length - 1; + while (low <= high) { + const mid = Math.floor((low + high) / 2); + const element = sortedArray[mid]; + // console.log('mid element is ' + element); + if (compareFn(element, value) === Compare.LESS_THAN) { + low = mid + 1; + // console.log('low is ' + low); + } else if (compareFn(element, value) === Compare.BIGGER_THAN) { + high = mid - 1; + // console.log('high is ' + high); + } else { + // console.log('found it'); + return mid; + } + } + return DOES_NOT_EXIST; +} diff --git a/src/js/algorithms/search/interpolation-search.js b/src/js/algorithms/search/interpolation-search.js new file mode 100644 index 00000000..2f9f7278 --- /dev/null +++ b/src/js/algorithms/search/interpolation-search.js @@ -0,0 +1,40 @@ +import { + biggerEquals, + Compare, + defaultCompare, + defaultEquals, + defaultDiff, + DOES_NOT_EXIST, + lesserEquals +} from '../../util'; + +export function interpolationSearch( + array, + value, + compareFn = defaultCompare, + equalsFn = defaultEquals, + diffFn = defaultDiff +) { + const { length } = array; + let low = 0; + let high = length - 1; + let position = -1; + let delta = -1; + while ( + low <= high + && biggerEquals(value, array[low], compareFn) + && lesserEquals(value, array[high], compareFn) + ) { + delta = diffFn(value, array[low]) / diffFn(array[high], array[low]); + position = low + Math.floor((high - low) * delta); + if (equalsFn(array[position], value)) { + return position; + } + if (compareFn(array[position], value) === Compare.LESS_THAN) { + low = position + 1; + } else { + high = position - 1; + } + } + return DOES_NOT_EXIST; +} diff --git a/src/js/algorithms/search/min-max-search.js b/src/js/algorithms/search/min-max-search.js new file mode 100644 index 00000000..ddefb113 --- /dev/null +++ b/src/js/algorithms/search/min-max-search.js @@ -0,0 +1,26 @@ +import { defaultCompare, Compare } from '../../util'; + +export function findMaxValue(array, compareFn = defaultCompare) { + if (array && array.length > 0) { + let max = array[0]; + for (let i = 1; i < array.length; i++) { + if (compareFn(max, array[i]) === Compare.LESS_THAN) { + max = array[i]; + } + } + return max; + } + return undefined; +} +export function findMinValue(array, compareFn = defaultCompare) { + if (array && array.length > 0) { + let min = array[0]; + for (let i = 1; i < array.length; i++) { + if (compareFn(min, array[i]) === Compare.BIGGER_THAN) { + min = array[i]; + } + } + return min; + } + return undefined; +} diff --git a/src/js/algorithms/search/sequential-search.js b/src/js/algorithms/search/sequential-search.js new file mode 100644 index 00000000..346c23ac --- /dev/null +++ b/src/js/algorithms/search/sequential-search.js @@ -0,0 +1,10 @@ +import { defaultEquals, DOES_NOT_EXIST } from '../../util'; + +export function sequentialSearch(array, value, equalsFn = defaultEquals) { + for (let i = 0; i < array.length; i++) { + if (equalsFn(value, array[i])) { + return i; + } + } + return DOES_NOT_EXIST; +} diff --git "a/src/js/algorithms/shuffle/fisher\342\200\223yates.js" "b/src/js/algorithms/shuffle/fisher\342\200\223yates.js" new file mode 100644 index 00000000..f951a3ca --- /dev/null +++ "b/src/js/algorithms/shuffle/fisher\342\200\223yates.js" @@ -0,0 +1,11 @@ +import { swap } from '../../util'; + +export function shuffle(array) { + let currentIndex = array.length; + while (currentIndex !== 0) { + const randomIndex = Math.floor(Math.random() * currentIndex); + currentIndex--; + swap(array, currentIndex, randomIndex); + } + return array; +} diff --git a/src/js/algorithms/sorting/bubble-sort-improved.js b/src/js/algorithms/sorting/bubble-sort-improved.js new file mode 100644 index 00000000..a0aba370 --- /dev/null +++ b/src/js/algorithms/sorting/bubble-sort-improved.js @@ -0,0 +1,16 @@ +import { Compare, defaultCompare, swap } from '../../util'; + +export function modifiedBubbleSort(array, compareFn = defaultCompare) { + const { length } = array; + for (let i = 0; i < length; i++) { + // console.log('--- '); + for (let j = 0; j < length - 1 - i; j++) { + // console.log('compare ' + array[j] + ' with ' + array[j + 1]); + if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) { + // console.log('swap ' + array[j] + ' with ' + array[j + 1]); + swap(array, j, j + 1); + } + } + } + return array; +} diff --git a/src/js/algorithms/sorting/bubble-sort.js b/src/js/algorithms/sorting/bubble-sort.js new file mode 100644 index 00000000..7d5b928e --- /dev/null +++ b/src/js/algorithms/sorting/bubble-sort.js @@ -0,0 +1,16 @@ +import { Compare, defaultCompare, swap } from '../../util'; + +export function bubbleSort(array, compareFn = defaultCompare) { + const { length } = array; + for (let i = 0; i < length; i++) { + // console.log('--- '); + for (let j = 0; j < length - 1; j++) { + // console.log('compare ' + array[j] + ' with ' + array[j + 1]); + if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) { + // console.log('swap ' + array[j] + ' with ' + array[j + 1]); + swap(array, j, j + 1); + } + } + } + return array; +} diff --git a/src/js/algorithms/sorting/bucket-sort.js b/src/js/algorithms/sorting/bucket-sort.js new file mode 100644 index 00000000..1a11b699 --- /dev/null +++ b/src/js/algorithms/sorting/bucket-sort.js @@ -0,0 +1,39 @@ +import { insertionSort } from './insertion-sort'; + +function createBuckets(array, bucketSize) { + let minValue = array[0]; + let maxValue = array[0]; + for (let i = 1; i < array.length; i++) { + if (array[i] < minValue) { + minValue = array[i]; + } else if (array[i] > maxValue) { + maxValue = array[i]; + } + } + const bucketCount = Math.floor((maxValue - minValue) / bucketSize) + 1; + const buckets = []; + for (let i = 0; i < bucketCount; i++) { + buckets[i] = []; + } + for (let i = 0; i < array.length; i++) { + buckets[Math.floor((array[i] - minValue) / bucketSize)].push(array[i]); + } + return buckets; +} +function sortBuckets(buckets) { + const sortedArray = []; + for (let i = 0; i < buckets.length; i++) { + if (buckets[i] != null) { + insertionSort(buckets[i]); + sortedArray.push(...buckets[i]); + } + } + return sortedArray; +} +export function bucketSort(array, bucketSize = 5) { + if (array.length < 2) { + return array; + } + const buckets = createBuckets(array, bucketSize); + return sortBuckets(buckets); +} diff --git a/src/js/algorithms/sorting/counting-sort.js b/src/js/algorithms/sorting/counting-sort.js new file mode 100644 index 00000000..9a19201b --- /dev/null +++ b/src/js/algorithms/sorting/counting-sort.js @@ -0,0 +1,24 @@ +import { findMaxValue } from '../search/min-max-search'; + +export function countingSort(array) { + if (array.length < 2) { + return array; + } + const maxValue = findMaxValue(array); + let sortedIndex = 0; + const counts = new Array(maxValue + 1); + array.forEach(element => { + if (!counts[element]) { + counts[element] = 0; + } + counts[element]++; + }); + // console.log('Frequencies: ' + counts.join()); + counts.forEach((element, i) => { + while (element > 0) { + array[sortedIndex++] = i; + element--; + } + }); + return array; +} diff --git a/src/js/algorithms/sorting/heap-sort.js b/src/js/algorithms/sorting/heap-sort.js new file mode 100644 index 00000000..ff1c10f1 --- /dev/null +++ b/src/js/algorithms/sorting/heap-sort.js @@ -0,0 +1,34 @@ +import { defaultCompare, swap } from '../../util'; + +function heapify(array, index, heapSize, compareFn) { + let largest = index; + const left = (2 * index) + 1; + const right = (2 * index) + 2; + if (left < heapSize && compareFn(array[left], array[index]) > 0) { + largest = left; + } + if (right < heapSize && compareFn(array[right], array[largest]) > 0) { + largest = right; + } + if (largest !== index) { + swap(array, index, largest); + heapify(array, largest, heapSize, compareFn); + } +} + +function buildMaxHeap(array, compareFn) { + for (let i = Math.floor(array.length / 2); i >= 0; i -= 1) { + heapify(array, i, array.length, compareFn); + } + return array; +} + +export default function heapSort(array, compareFn = defaultCompare) { + let heapSize = array.length; + buildMaxHeap(array, compareFn); + while (heapSize > 1) { + swap(array, 0, --heapSize); + heapify(array, 0, heapSize, compareFn); + } + return array; +} diff --git a/src/js/algorithms/sorting/insertion-sort.js b/src/js/algorithms/sorting/insertion-sort.js new file mode 100644 index 00000000..e48689e6 --- /dev/null +++ b/src/js/algorithms/sorting/insertion-sort.js @@ -0,0 +1,19 @@ +import { Compare, defaultCompare } from '../../util'; + +export const insertionSort = (array, compareFn = defaultCompare) => { + const { length } = array; + let temp; + for (let i = 1; i < length; i++) { + let j = i; + temp = array[i]; + // console.log('to be inserted ' + temp); + while (j > 0 && compareFn(array[j - 1], temp) === Compare.BIGGER_THAN) { + // console.log('shift ' + array[j - 1]); + array[j] = array[j - 1]; + j--; + } + // console.log('insert ' + temp); + array[j] = temp; + } + return array; +}; diff --git a/src/js/algorithms/sorting/merge-sort.js b/src/js/algorithms/sorting/merge-sort.js new file mode 100644 index 00000000..5371e714 --- /dev/null +++ b/src/js/algorithms/sorting/merge-sort.js @@ -0,0 +1,21 @@ +import { Compare, defaultCompare } from '../../util'; + +function merge(left, right, compareFn) { + let i = 0; + let j = 0; + const result = []; + while (i < left.length && j < right.length) { + result.push(compareFn(left[i], right[j]) === Compare.LESS_THAN ? left[i++] : right[j++]); + } + return result.concat(i < left.length ? left.slice(i) : right.slice(j)); +} +export function mergeSort(array, compareFn = defaultCompare) { + if (array.length > 1) { + const { length } = array; + const middle = Math.floor(length / 2); + const left = mergeSort(array.slice(0, middle), compareFn); + const right = mergeSort(array.slice(middle, length), compareFn); + array = merge(left, right, compareFn); + } + return array; +} diff --git a/src/js/algorithms/sorting/quicksort.js b/src/js/algorithms/sorting/quicksort.js new file mode 100644 index 00000000..6e27167c --- /dev/null +++ b/src/js/algorithms/sorting/quicksort.js @@ -0,0 +1,38 @@ +import { Compare, defaultCompare, swap } from '../../util'; + +function partition(array, left, right, compareFn) { + const pivot = array[Math.floor((right + left) / 2)]; + let i = left; + let j = right; + + while (i <= j) { + while (compareFn(array[i], pivot) === Compare.LESS_THAN) { + i++; + } + while (compareFn(array[j], pivot) === Compare.BIGGER_THAN) { + j--; + } + if (i <= j) { + swap(array, i, j); + i++; + j--; + } + } + return i; +} +function quick(array, left, right, compareFn) { + let index; + if (array.length > 1) { + index = partition(array, left, right, compareFn); + if (left < index - 1) { + quick(array, left, index - 1, compareFn); + } + if (index < right) { + quick(array, index, right, compareFn); + } + } + return array; +} +export function quickSort(array, compareFn = defaultCompare) { + return quick(array, 0, array.length - 1, compareFn); +} diff --git a/src/js/algorithms/sorting/radix-sort.js b/src/js/algorithms/sorting/radix-sort.js new file mode 100644 index 00000000..db21c37a --- /dev/null +++ b/src/js/algorithms/sorting/radix-sort.js @@ -0,0 +1,44 @@ +import { findMaxValue, findMinValue } from '../search/min-max-search'; + +const getBucketIndex = (value, minValue, significantDigit, radixBase) => + Math.floor(((value - minValue) / significantDigit) % radixBase); + +const countingSortForRadix = (array, radixBase, significantDigit, minValue) => { + let bucketsIndex; + const buckets = []; + const aux = []; + for (let i = 0; i < radixBase; i++) { + buckets[i] = 0; + } + for (let i = 0; i < array.length; i++) { + bucketsIndex = getBucketIndex(array[i], minValue, significantDigit, radixBase); + buckets[bucketsIndex]++; + } + for (let i = 1; i < radixBase; i++) { + buckets[i] += buckets[i - 1]; + } + for (let i = array.length - 1; i >= 0; i--) { + bucketsIndex = getBucketIndex(array[i], minValue, significantDigit, radixBase); + aux[--buckets[bucketsIndex]] = array[i]; + } + for (let i = 0; i < array.length; i++) { + array[i] = aux[i]; + } + return array; +}; +export function radixSort(array, radixBase = 10) { + if (array.length < 2) { + return array; + } + const minValue = findMinValue(array); + const maxValue = findMaxValue(array); + // Perform counting sort for each significant digit, starting at 1 + let significantDigit = 1; + while ((maxValue - minValue) / significantDigit >= 1) { + // console.log('radix sort for digit ' + significantDigit); + array = countingSortForRadix(array, radixBase, significantDigit, minValue); + // console.log(array.join()); + significantDigit *= radixBase; + } + return array; +} diff --git a/src/js/algorithms/sorting/selection-sort.js b/src/js/algorithms/sorting/selection-sort.js new file mode 100644 index 00000000..55a9c2c0 --- /dev/null +++ b/src/js/algorithms/sorting/selection-sort.js @@ -0,0 +1,21 @@ +import { Compare, defaultCompare, swap } from '../../util'; + +export const selectionSort = (array, compareFn = defaultCompare) => { + const { length } = array; + let indexMin; + for (let i = 0; i < length - 1; i++) { + indexMin = i; + // console.log('index ' + array[i]); + for (let j = i; j < length; j++) { + if (compareFn(array[indexMin], array[j]) === Compare.BIGGER_THAN) { + // console.log('new index min ' + array[j]); + indexMin = j; + } + } + if (i !== indexMin) { + // console.log('swap ' + array[i] + ' with ' + array[indexMin]); + swap(array, i, indexMin); + } + } + return array; +}; diff --git a/src/js/algorithms/sorting/shell-sort.js b/src/js/algorithms/sorting/shell-sort.js new file mode 100644 index 00000000..e13127f1 --- /dev/null +++ b/src/js/algorithms/sorting/shell-sort.js @@ -0,0 +1,22 @@ +import { Compare, defaultCompare } from '../../util'; + +export function shellSort(array, compareFn = defaultCompare) { + let increment = array.length / 2; + while (increment > 0) { + for (let i = increment; i < array.length; i++) { + let j = i; + const temp = array[i]; + while (j >= increment && compareFn(array[j - increment], temp) === Compare.BIGGER_THAN) { + array[j] = array[j - increment]; + j -= increment; + } + array[j] = temp; + } + if (increment === 2) { + increment = 1; + } else { + increment = Math.floor((increment * 5) / 11); + } + } + return array; +} diff --git a/src/js/data-structures/avl-tree.js b/src/js/data-structures/avl-tree.js new file mode 100644 index 00000000..6b4ee7c0 --- /dev/null +++ b/src/js/data-structures/avl-tree.js @@ -0,0 +1,162 @@ +import { Compare, defaultCompare } from '../util'; +import BinarySearchTree from './binary-search-tree'; +import { Node } from './models/node'; + +const BalanceFactor = { + UNBALANCED_RIGHT: 1, + SLIGHTLY_UNBALANCED_RIGHT: 2, + BALANCED: 3, + SLIGHTLY_UNBALANCED_LEFT: 4, + UNBALANCED_LEFT: 5 +}; + +export default class AVLTree extends BinarySearchTree { + constructor(compareFn = defaultCompare) { + super(compareFn); + this.compareFn = compareFn; + this.root = null; + } + + getNodeHeight(node) { + if (node == null) { + return -1; + } + return Math.max(this.getNodeHeight(node.left), this.getNodeHeight(node.right)) + 1; + } + + /** + * Left left case: rotate right + * + * b a + * / \ / \ + * a e -> rotationLL(b) -> c b + * / \ / \ + * c d d e + * + * @param node Node + */ + rotationLL(node) { + const tmp = node.left; + node.left = tmp.right; + tmp.right = node; + return tmp; + } + + /** + * Right right case: rotate left + * + * a b + * / \ / \ + * c b -> rotationRR(a) -> a e + * / \ / \ + * d e c d + * + * @param node Node + */ + rotationRR(node) { + const tmp = node.right; + node.right = tmp.left; + tmp.left = node; + return tmp; + } + + /** + * Left right case: rotate left then right + * @param node Node + */ + rotationLR(node) { + node.left = this.rotationRR(node.left); + return this.rotationLL(node); + } + + /** + * Right left case: rotate right then left + * @param node Node + */ + rotationRL(node) { + node.right = this.rotationLL(node.right); + return this.rotationRR(node); + } + + getBalanceFactor(node) { + const heightDifference = this.getNodeHeight(node.left) - this.getNodeHeight(node.right); + switch (heightDifference) { + case -2: + return BalanceFactor.UNBALANCED_RIGHT; + case -1: + return BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT; + case 1: + return BalanceFactor.SLIGHTLY_UNBALANCED_LEFT; + case 2: + return BalanceFactor.UNBALANCED_LEFT; + default: + return BalanceFactor.BALANCED; + } + } + + insert(key) { + this.root = this.insertNode(this.root, key); + } + + insertNode(node, key) { + if (node == null) { + return new Node(key); + } + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + node.left = this.insertNode(node.left, key); + } else { + node.right = this.insertNode(node.right, key); + } + + // verify if tree is balanced + const balanceFactor = this.getBalanceFactor(node); + if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) { + if (this.compareFn(key, node.left.key) === Compare.LESS_THAN) { + // Left left case + node = this.rotationLL(node); + } else { + // Left right case + node = this.rotationLR(node); + } + } + if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) { + if (this.compareFn(key, node.right.key) === Compare.BIGGER_THAN) { + // Right right case + node = this.rotationRR(node); + } else { + // Right left case + node = this.rotationRL(node); + } + } + return node; + } + + removeNode(node, key) { + node = super.removeNode(node, key); // {1} + if (node == null) { + return node; + } + + // verify if tree is balanced + const balanceFactor = this.getBalanceFactor(node); + if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) { + if (this.compareFn(key, node.left.key) === Compare.LESS_THAN) { + // Left left case + node = this.rotationLL(node); + } else { + // Left right case + node = this.rotationLR(node); + } + } + if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) { + if (this.compareFn(key, node.right.key) === Compare.BIGGER_THAN) { + // Right right case + node = this.rotationRR(node); + } else { + // Right left case + node = this.rotationRL(node); + } + } + return node; + } +} diff --git a/src/js/data-structures/binary-search-tree.js b/src/js/data-structures/binary-search-tree.js new file mode 100644 index 00000000..98795a16 --- /dev/null +++ b/src/js/data-structures/binary-search-tree.js @@ -0,0 +1,152 @@ +import { Compare, defaultCompare } from '../util'; +import { Node } from './models/node'; + +export default class BinarySearchTree { + constructor(compareFn = defaultCompare) { + this.compareFn = compareFn; + this.root = undefined; + } + + insert(key) { + // special case: first key + if (this.root == null) { + this.root = new Node(key); + } else { + this.insertNode(this.root, key); + } + } + + insertNode(node, key) { + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + if (node.left == null) { + node.left = new Node(key); + } else { + this.insertNode(node.left, key); + } + } else if (node.right == null) { + node.right = new Node(key); + } else { + this.insertNode(node.right, key); + } + } + + getRoot() { + return this.root; + } + + search(key) { + return this.searchNode(this.root, key); + } + + searchNode(node, key) { + if (node == null) { + return false; + } + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + return this.searchNode(node.left, key); + } if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) { + return this.searchNode(node.right, key); + } + return true; + } + + inOrderTraverse(callback) { + this.inOrderTraverseNode(this.root, callback); + } + + inOrderTraverseNode(node, callback) { + if (node != null) { + this.inOrderTraverseNode(node.left, callback); + callback(node.key); + this.inOrderTraverseNode(node.right, callback); + } + } + + preOrderTraverse(callback) { + this.preOrderTraverseNode(this.root, callback); + } + + preOrderTraverseNode(node, callback) { + if (node != null) { + callback(node.key); + this.preOrderTraverseNode(node.left, callback); + this.preOrderTraverseNode(node.right, callback); + } + } + + postOrderTraverse(callback) { + this.postOrderTraverseNode(this.root, callback); + } + + postOrderTraverseNode(node, callback) { + if (node != null) { + this.postOrderTraverseNode(node.left, callback); + this.postOrderTraverseNode(node.right, callback); + callback(node.key); + } + } + + min() { + return this.minNode(this.root); + } + + minNode(node) { + let current = node; + while (current != null && current.left != null) { + current = current.left; + } + return current; + } + + max() { + return this.maxNode(this.root); + } + + maxNode(node) { + let current = node; + while (current != null && current.right != null) { + current = current.right; + } + return current; + } + + remove(key) { + this.root = this.removeNode(this.root, key); + } + + removeNode(node, key) { + if (node == null) { + return undefined; + } + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + node.left = this.removeNode(node.left, key); + return node; + } if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) { + node.right = this.removeNode(node.right, key); + return node; + } + // key is equal to node.item + // handle 3 special conditions + // 1 - a leaf node + // 2 - a node with only 1 child + // 3 - a node with 2 children + // case 1 + if (node.left == null && node.right == null) { + node = undefined; + return node; + } + // case 2 + if (node.left == null) { + node = node.right; + return node; + } if (node.right == null) { + node = node.left; + return node; + } + // case 3 + const aux = this.minNode(node.right); + node.key = aux.key; + node.right = this.removeNode(node.right, aux.key); + return node; + } +} diff --git a/src/js/data-structures/circular-linked-list.js b/src/js/data-structures/circular-linked-list.js new file mode 100644 index 00000000..865fcb70 --- /dev/null +++ b/src/js/data-structures/circular-linked-list.js @@ -0,0 +1,75 @@ +import { defaultEquals } from '../util'; +import LinkedList from './linked-list'; +import { Node } from './models/linked-list-models'; + +export default class CircularLinkedList extends LinkedList { + constructor(equalsFn = defaultEquals) { + super(equalsFn); + } + + push(element) { + const node = new Node(element); + let current; + if (this.head == null) { + this.head = node; + } else { + current = this.getElementAt(this.size() - 1); + current.next = node; + } + // set node.next to head - to have circular list + node.next = this.head; + this.count++; + } + + insert(element, index) { + if (index >= 0 && index <= this.count) { + const node = new Node(element); + let current = this.head; + if (index === 0) { + if (this.head == null) { + // if no node in list + this.head = node; + node.next = this.head; + } else { + node.next = current; + current = this.getElementAt(this.size() - 1); + // update last element + this.head = node; + current.next = this.head; + } + } else { + const previous = this.getElementAt(index - 1); + node.next = previous.next; + previous.next = node; + } + this.count++; + return true; + } + return false; + } + + removeAt(index) { + if (index >= 0 && index < this.count) { + let current = this.head; + if (index === 0) { + if (this.size() === 1) { + this.head = undefined; + } else { + const removed = this.head; + current = this.getElementAt(this.size() - 1); + this.head = this.head.next; + current.next = this.head; + current = removed; + } + } else { + // no need to update last element for circular list + const previous = this.getElementAt(index - 1); + current = previous.next; + previous.next = current.next; + } + this.count--; + return current.element; + } + return undefined; + } +} diff --git a/src/js/data-structures/deque.js b/src/js/data-structures/deque.js new file mode 100644 index 00000000..82b50617 --- /dev/null +++ b/src/js/data-structures/deque.js @@ -0,0 +1,88 @@ +// @ts-check + +export default class Deque { + constructor() { + this.count = 0; + this.lowestCount = 0; + this.items = {}; + } + + addFront(element) { + if (this.isEmpty()) { + this.addBack(element); + } else if (this.lowestCount > 0) { + this.lowestCount--; + this.items[this.lowestCount] = element; + } else { + for (let i = this.count; i > 0; i--) { + this.items[i] = this.items[i - 1]; + } + this.count++; + this.items[0] = element; + } + } + + addBack(element) { + this.items[this.count] = element; + this.count++; + } + + removeFront() { + if (this.isEmpty()) { + return undefined; + } + const result = this.items[this.lowestCount]; + delete this.items[this.lowestCount]; + this.lowestCount++; + return result; + } + + removeBack() { + if (this.isEmpty()) { + return undefined; + } + this.count--; + const result = this.items[this.count]; + delete this.items[this.count]; + return result; + } + + peekFront() { + if (this.isEmpty()) { + return undefined; + } + return this.items[this.lowestCount]; + } + + peekBack() { + if (this.isEmpty()) { + return undefined; + } + return this.items[this.count - 1]; + } + + isEmpty() { + return this.size() === 0; + } + + clear() { + this.items = {}; + this.count = 0; + this.lowestCount = 0; + } + + size() { + return this.count - this.lowestCount; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + let objString = `${this.items[this.lowestCount]}`; + for (let i = this.lowestCount + 1; i < this.count; i++) { + objString = `${objString},${this.items[i]}`; + } + return objString; + } +} diff --git a/src/js/data-structures/dictionary.js b/src/js/data-structures/dictionary.js new file mode 100644 index 00000000..2b0568bd --- /dev/null +++ b/src/js/data-structures/dictionary.js @@ -0,0 +1,81 @@ +import { defaultToString } from '../util'; +import { ValuePair } from './models/value-pair'; + +export default class Dictionary { + constructor(toStrFn = defaultToString) { + this.toStrFn = toStrFn; + this.table = {}; + } + + set(key, value) { + if (key != null && value != null) { + const tableKey = this.toStrFn(key); + this.table[tableKey] = new ValuePair(key, value); + return true; + } + return false; + } + + get(key) { + const valuePair = this.table[this.toStrFn(key)]; + return valuePair == null ? undefined : valuePair.value; + } + + hasKey(key) { + return this.table[this.toStrFn(key)] != null; + } + + remove(key) { + if (this.hasKey(key)) { + delete this.table[this.toStrFn(key)]; + return true; + } + return false; + } + + values() { + return this.keyValues().map(valuePair => valuePair.value); + } + + keys() { + return this.keyValues().map(valuePair => valuePair.key); + } + + keyValues() { + return Object.values(this.table); + } + + forEach(callbackFn) { + const valuePairs = this.keyValues(); + for (let i = 0; i < valuePairs.length; i++) { + const result = callbackFn(valuePairs[i].key, valuePairs[i].value); + if (result === false) { + break; + } + } + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.table).length; + } + + clear() { + this.table = {}; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const valuePairs = this.keyValues(); + let objString = `${valuePairs[0].toString()}`; + for (let i = 1; i < valuePairs.length; i++) { + objString = `${objString},${valuePairs[i].toString()}`; + } + return objString; + } +} diff --git a/src/js/data-structures/doubly-linked-list.js b/src/js/data-structures/doubly-linked-list.js new file mode 100644 index 00000000..e6547ec4 --- /dev/null +++ b/src/js/data-structures/doubly-linked-list.js @@ -0,0 +1,138 @@ +import { defaultEquals } from '../util'; +import LinkedList from './linked-list'; +import { DoublyNode } from './models/linked-list-models'; + +export default class DoublyLinkedList extends LinkedList { + constructor(equalsFn = defaultEquals) { + super(equalsFn); + this.tail = undefined; + } + + push(element) { + const node = new DoublyNode(element); + if (this.head == null) { + this.head = node; + this.tail = node; // NEW + } else { + // attach to the tail node // NEW + this.tail.next = node; + node.prev = this.tail; + this.tail = node; + } + this.count++; + } + + insert(element, index) { + if (index >= 0 && index <= this.count) { + const node = new DoublyNode(element); + let current = this.head; + if (index === 0) { + if (this.head == null) { // NEW + this.head = node; + this.tail = node; // NEW + } else { + node.next = this.head; + this.head.prev = node; // NEW + this.head = node; + } + } else if (index === this.count) { // last item NEW + current = this.tail; + current.next = node; + node.prev = current; + this.tail = node; + } else { + const previous = this.getElementAt(index - 1); + current = previous.next; + node.next = current; + previous.next = node; + current.prev = node; // NEW + node.prev = previous; // NEW + } + this.count++; + return true; + } + return false; + } + + removeAt(index) { + if (index >= 0 && index < this.count) { + let current = this.head; + if (index === 0) { + this.head = this.head.next; + // if there is only one item, then we update tail as well //NEW + if (this.count === 1) { + // {2} + this.tail = undefined; + } else { + this.head.prev = undefined; + } + } else if (index === this.count - 1) { + // last item //NEW + current = this.tail; + this.tail = current.prev; + this.tail.next = undefined; + } else { + current = this.getElementAt(index); + const previous = current.prev; + // link previous with current's next - skip it to remove + previous.next = current.next; + current.next.prev = previous; // NEW + } + this.count--; + return current.element; + } + return undefined; + } + + indexOf(element) { + let current = this.head; + let index = 0; + while (current != null) { + if (this.equalsFn(element, current.element)) { + return index; + } + index++; + current = current.next; + } + return -1; + } + + getHead() { + return this.head; + } + + getTail() { + return this.tail; + } + + clear() { + super.clear(); + this.tail = undefined; + } + + toString() { + if (this.head == null) { + return ''; + } + let objString = `${this.head.element}`; + let current = this.head.next; + while (current != null) { + objString = `${objString},${current.element}`; + current = current.next; + } + return objString; + } + + inverseToString() { + if (this.tail == null) { + return ''; + } + let objString = `${this.tail.element}`; + let previous = this.tail.prev; + while (previous != null) { + objString = `${objString},${previous.element}`; + previous = previous.prev; + } + return objString; + } +} diff --git a/src/js/data-structures/graph.js b/src/js/data-structures/graph.js new file mode 100644 index 00000000..f9bfbe51 --- /dev/null +++ b/src/js/data-structures/graph.js @@ -0,0 +1,50 @@ +import Dictionary from './dictionary'; + +export default class Graph { + constructor(isDirected = false) { + this.isDirected = isDirected; + this.vertices = []; + this.adjList = new Dictionary(); + } + + addVertex(v) { + if (!this.vertices.includes(v)) { + this.vertices.push(v); + this.adjList.set(v, []); // initialize adjacency list with array as well; + } + } + + addEdge(a, b) { + if (!this.adjList.get(a)) { + this.addVertex(a); + } + if (!this.adjList.get(b)) { + this.addVertex(b); + } + this.adjList.get(a).push(b); + if (this.isDirected !== true) { + this.adjList.get(b).push(a); + } + } + + getVertices() { + return this.vertices; + } + + getAdjList() { + return this.adjList; + } + + toString() { + let s = ''; + for (let i = 0; i < this.vertices.length; i++) { + s += `${this.vertices[i]} -> `; + const neighbors = this.adjList.get(this.vertices[i]); + for (let j = 0; j < neighbors.length; j++) { + s += `${neighbors[j]} `; + } + s += '\n'; + } + return s; + } +} diff --git a/src/js/data-structures/hash-table-linear-probing-lazy.js b/src/js/data-structures/hash-table-linear-probing-lazy.js new file mode 100644 index 00000000..d7314f0e --- /dev/null +++ b/src/js/data-structures/hash-table-linear-probing-lazy.js @@ -0,0 +1,132 @@ +import { defaultToString } from '../util'; +import { ValuePairLazy } from './models/value-pair-lazy'; + +export default class HashTableLinearProbingLazy { + constructor(toStrFn = defaultToString) { + this.toStrFn = toStrFn; + this.table = {}; + } + + loseloseHashCode(key) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + hashCode(key) { + return this.loseloseHashCode(key); + } + + put(key, value) { + if (key != null && value != null) { + const position = this.hashCode(key); + if ( + this.table[position] == null + || (this.table[position] != null && this.table[position].isDeleted) + ) { + this.table[position] = new ValuePairLazy(key, value); + } else { + let index = position + 1; + while (this.table[index] != null && !this.table[position].isDeleted) { + index++; + } + this.table[index] = new ValuePairLazy(key, value); + } + return true; + } + return false; + } + + get(key) { + const position = this.hashCode(key); + if (this.table[position] != null) { + if (this.table[position].key === key && !this.table[position].isDeleted) { + return this.table[position].value; + } + let index = position + 1; + while ( + this.table[index] != null + && (this.table[index].key !== key || this.table[index].isDeleted) + ) { + if (this.table[index].key === key && this.table[index].isDeleted) { + return undefined; + } + index++; + } + if ( + this.table[index] != null + && this.table[index].key === key + && !this.table[index].isDeleted + ) { + return this.table[position].value; + } + } + return undefined; + } + + remove(key) { + const position = this.hashCode(key); + if (this.table[position] != null) { + if (this.table[position].key === key && !this.table[position].isDeleted) { + this.table[position].isDeleted = true; + return true; + } + let index = position + 1; + while ( + this.table[index] != null + && (this.table[index].key !== key || this.table[index].isDeleted) + ) { + index++; + } + if ( + this.table[index] != null + && this.table[index].key === key + && !this.table[index].isDeleted + ) { + this.table[index].isDeleted = true; + return true; + } + } + return false; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + let count = 0; + Object.values(this.table).forEach(valuePair => { + count += valuePair.isDeleted === true ? 0 : 1; + }); + return count; + } + + clear() { + this.table = {}; + } + + getTable() { + return this.table; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[ + keys[i] + ].toString()}}`; + } + return objString; + } +} diff --git a/src/js/data-structures/hash-table-linear-probing.js b/src/js/data-structures/hash-table-linear-probing.js new file mode 100644 index 00000000..73f70374 --- /dev/null +++ b/src/js/data-structures/hash-table-linear-probing.js @@ -0,0 +1,124 @@ +import { defaultToString } from '../util'; +import { ValuePair } from './models/value-pair'; + +export default class HashTableLinearProbing { + constructor(toStrFn = defaultToString) { + this.toStrFn = toStrFn; + this.table = {}; + } + + loseloseHashCode(key) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + hashCode(key) { + return this.loseloseHashCode(key); + } + + put(key, value) { + if (key != null && value != null) { + const position = this.hashCode(key); + if (this.table[position] == null) { + this.table[position] = new ValuePair(key, value); + } else { + let index = position + 1; + while (this.table[index] != null) { + index++; + } + this.table[index] = new ValuePair(key, value); + } + return true; + } + return false; + } + + get(key) { + const position = this.hashCode(key); + if (this.table[position] != null) { + if (this.table[position].key === key) { + return this.table[position].value; + } + let index = position + 1; + while (this.table[index] != null && this.table[index].key !== key) { + index++; + } + if (this.table[index] != null && this.table[index].key === key) { + return this.table[index].value; + } + } + return undefined; + } + + remove(key) { + const position = this.hashCode(key); + if (this.table[position] != null) { + if (this.table[position].key === key) { + delete this.table[position]; + this.verifyRemoveSideEffect(key, position); + return true; + } + let index = position + 1; + while (this.table[index] != null && this.table[index].key !== key) { + index++; + } + if (this.table[index] != null && this.table[index].key === key) { + delete this.table[index]; + this.verifyRemoveSideEffect(key, index); + return true; + } + } + return false; + } + + verifyRemoveSideEffect(key, removedPosition) { + const hash = this.hashCode(key); + let index = removedPosition + 1; + while (this.table[index] != null) { + const posHash = this.hashCode(this.table[index].key); + if (posHash <= hash || posHash <= removedPosition) { + this.table[removedPosition] = this.table[index]; + delete this.table[index]; + removedPosition = index; + } + index++; + } + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.table).length; + } + + clear() { + this.table = {}; + } + + getTable() { + return this.table; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[ + keys[i] + ].toString()}}`; + } + return objString; + } +} diff --git a/src/js/data-structures/hash-table-separate-chaining.js b/src/js/data-structures/hash-table-separate-chaining.js new file mode 100644 index 00000000..c8646ae9 --- /dev/null +++ b/src/js/data-structures/hash-table-separate-chaining.js @@ -0,0 +1,106 @@ +import { defaultToString } from '../util'; +import LinkedList from './linked-list'; +import { ValuePair } from './models/value-pair'; + +export default class HashTableSeparateChaining { + constructor(toStrFn = defaultToString) { + this.toStrFn = toStrFn; + this.table = {}; + } + + loseloseHashCode(key) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + hashCode(key) { + return this.loseloseHashCode(key); + } + + put(key, value) { + if (key != null && value != null) { + const position = this.hashCode(key); + if (this.table[position] == null) { + this.table[position] = new LinkedList(); + } + this.table[position].push(new ValuePair(key, value)); + return true; + } + return false; + } + + get(key) { + const position = this.hashCode(key); + const linkedList = this.table[position]; + if (linkedList != null && !linkedList.isEmpty()) { + let current = linkedList.getHead(); + while (current != null) { + if (current.element.key === key) { + return current.element.value; + } + current = current.next; + } + } + return undefined; + } + + remove(key) { + const position = this.hashCode(key); + const linkedList = this.table[position]; + if (linkedList != null && !linkedList.isEmpty()) { + let current = linkedList.getHead(); + while (current != null) { + if (current.element.key === key) { + linkedList.remove(current.element); + if (linkedList.isEmpty()) { + delete this.table[position]; + } + return true; + } + current = current.next; + } + } + return false; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + let count = 0; + Object.values(this.table).forEach(linkedList => { + count += linkedList.size(); + }); + return count; + } + + clear() { + this.table = {}; + } + + getTable() { + return this.table; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[ + keys[i] + ].toString()}}`; + } + return objString; + } +} diff --git a/src/js/data-structures/hash-table.js b/src/js/data-structures/hash-table.js new file mode 100644 index 00000000..79bc51fd --- /dev/null +++ b/src/js/data-structures/hash-table.js @@ -0,0 +1,85 @@ +import { defaultToString } from '../util'; +import { ValuePair } from './models/value-pair'; + +export default class HashTable { + constructor(toStrFn = defaultToString) { + this.toStrFn = toStrFn; + this.table = {}; + } + + loseloseHashCode(key) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + /* djb2HashCode(key) { + const tableKey = this.toStrFn(key); + let hash = 5381; + for (let i = 0; i < tableKey.length; i++) { + hash = (hash * 33) + tableKey.charCodeAt(i); + } + return hash % 1013; + } */ + hashCode(key) { + return this.loseloseHashCode(key); + } + + put(key, value) { + if (key != null && value != null) { + const position = this.hashCode(key); + this.table[position] = new ValuePair(key, value); + return true; + } + return false; + } + + get(key) { + const valuePair = this.table[this.hashCode(key)]; + return valuePair == null ? undefined : valuePair.value; + } + + remove(key) { + const hash = this.hashCode(key); + const valuePair = this.table[hash]; + if (valuePair != null) { + delete this.table[hash]; + return true; + } + return false; + } + + getTable() { + return this.table; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.table).length; + } + + clear() { + this.table = {}; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[keys[i]].toString()}}`; + } + return objString; + } +} diff --git a/src/js/data-structures/heap.js b/src/js/data-structures/heap.js new file mode 100644 index 00000000..889e5957 --- /dev/null +++ b/src/js/data-structures/heap.js @@ -0,0 +1,121 @@ +import { + Compare, defaultCompare, reverseCompare, swap +} from '../util'; + +export class MinHeap { + constructor(compareFn = defaultCompare) { + this.compareFn = compareFn; + this.heap = []; + } + + getLeftIndex(index) { + return (2 * index) + 1; + } + + getRightIndex(index) { + return (2 * index) + 2; + } + + getParentIndex(index) { + if (index === 0) { + return undefined; + } + return Math.floor((index - 1) / 2); + } + + size() { + return this.heap.length; + } + + isEmpty() { + return this.size() <= 0; + } + + clear() { + this.heap = []; + } + + findMinimum() { + return this.isEmpty() ? undefined : this.heap[0]; + } + + insert(value) { + if (value != null) { + const index = this.heap.length; + this.heap.push(value); + this.siftUp(index); + return true; + } + return false; + } + + siftDown(index) { + let element = index; + const left = this.getLeftIndex(index); + const right = this.getRightIndex(index); + const size = this.size(); + if ( + left < size + && this.compareFn(this.heap[element], this.heap[left]) === Compare.BIGGER_THAN + ) { + element = left; + } + if ( + right < size + && this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN + ) { + element = right; + } + if (index !== element) { + swap(this.heap, index, element); + this.siftDown(element); + } + } + + siftUp(index) { + let parent = this.getParentIndex(index); + while ( + index > 0 + && this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN + ) { + swap(this.heap, parent, index); + index = parent; + parent = this.getParentIndex(index); + } + } + + extract() { + if (this.isEmpty()) { + return undefined; + } + if (this.size() === 1) { + return this.heap.shift(); + } + const removedValue = this.heap[0]; + this.heap[0] = this.heap.pop(); + this.siftDown(0); + return removedValue; + } + + heapify(array) { + if (array) { + this.heap = array; + } + const maxIndex = Math.floor(this.size() / 2) - 1; + for (let i = 0; i <= maxIndex; i++) { + this.siftDown(i); + } + return this.heap; + } + + getAsArray() { + return this.heap; + } +} +export class MaxHeap extends MinHeap { + constructor(compareFn = defaultCompare) { + super(compareFn); + this.compareFn = compareFn; + this.compareFn = reverseCompare(compareFn); + } +} diff --git a/src/js/data-structures/linked-list.js b/src/js/data-structures/linked-list.js new file mode 100644 index 00000000..fdd32d8b --- /dev/null +++ b/src/js/data-structures/linked-list.js @@ -0,0 +1,117 @@ +import { defaultEquals } from '../util'; +import { Node } from './models/linked-list-models'; + +export default class LinkedList { + constructor(equalsFn = defaultEquals) { + this.equalsFn = equalsFn; + this.count = 0; + this.head = undefined; + } + + push(element) { + const node = new Node(element); + let current; + if (this.head == null) { + // catches null && undefined + this.head = node; + } else { + current = this.head; + while (current.next != null) { + current = current.next; + } + current.next = node; + } + this.count++; + } + + getElementAt(index) { + if (index >= 0 && index <= this.count) { + let node = this.head; + for (let i = 0; i < index && node != null; i++) { + node = node.next; + } + return node; + } + return undefined; + } + + insert(element, index) { + if (index >= 0 && index <= this.count) { + const node = new Node(element); + if (index === 0) { + const current = this.head; + node.next = current; + this.head = node; + } else { + const previous = this.getElementAt(index - 1); + node.next = previous.next; + previous.next = node; + } + this.count++; + return true; + } + return false; + } + + removeAt(index) { + if (index >= 0 && index < this.count) { + let current = this.head; + if (index === 0) { + this.head = current.next; + } else { + const previous = this.getElementAt(index - 1); + current = previous.next; + previous.next = current.next; + } + this.count--; + return current.element; + } + return undefined; + } + + remove(element) { + const index = this.indexOf(element); + return this.removeAt(index); + } + + indexOf(element) { + let current = this.head; + for (let i = 0; i < this.size() && current != null; i++) { + if (this.equalsFn(element, current.element)) { + return i; + } + current = current.next; + } + return -1; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return this.count; + } + + getHead() { + return this.head; + } + + clear() { + this.head = undefined; + this.count = 0; + } + + toString() { + if (this.head == null) { + return ''; + } + let objString = `${this.head.element}`; + let current = this.head.next; + for (let i = 1; i < this.size() && current != null; i++) { + objString = `${objString},${current.element}`; + current = current.next; + } + return objString; + } +} diff --git a/src/js/data-structures/models/linked-list-models.js b/src/js/data-structures/models/linked-list-models.js new file mode 100644 index 00000000..31f5dd95 --- /dev/null +++ b/src/js/data-structures/models/linked-list-models.js @@ -0,0 +1,12 @@ +export class Node { + constructor(element, next) { + this.element = element; + this.next = next; + } +} +export class DoublyNode extends Node { + constructor(element, next, prev) { + super(element, next); + this.prev = prev; + } +} diff --git a/src/js/data-structures/models/node.js b/src/js/data-structures/models/node.js new file mode 100644 index 00000000..33b4f371 --- /dev/null +++ b/src/js/data-structures/models/node.js @@ -0,0 +1,11 @@ +export class Node { + constructor(key) { + this.key = key; + this.left = undefined; + this.right = undefined; + } + + toString() { + return `${this.key}`; + } +} diff --git a/src/js/data-structures/models/value-pair-lazy.js b/src/js/data-structures/models/value-pair-lazy.js new file mode 100644 index 00000000..ff2e4398 --- /dev/null +++ b/src/js/data-structures/models/value-pair-lazy.js @@ -0,0 +1,10 @@ +import { ValuePair } from './value-pair'; + +export class ValuePairLazy extends ValuePair { + constructor(key, value, isDeleted = false) { + super(key, value); + this.key = key; + this.value = value; + this.isDeleted = isDeleted; + } +} diff --git a/src/js/data-structures/models/value-pair.js b/src/js/data-structures/models/value-pair.js new file mode 100644 index 00000000..7aa20025 --- /dev/null +++ b/src/js/data-structures/models/value-pair.js @@ -0,0 +1,10 @@ +export class ValuePair { + constructor(key, value) { + this.key = key; + this.value = value; + } + + toString() { + return `[#${this.key}: ${this.value}]`; + } +} diff --git a/src/js/data-structures/queue.js b/src/js/data-structures/queue.js new file mode 100644 index 00000000..6c879004 --- /dev/null +++ b/src/js/data-structures/queue.js @@ -0,0 +1,56 @@ +// @ts-check + +export default class Queue { + constructor() { + this.count = 0; + this.lowestCount = 0; + this.items = {}; + } + + enqueue(element) { + this.items[this.count] = element; + this.count++; + } + + dequeue() { + if (this.isEmpty()) { + return undefined; + } + const result = this.items[this.lowestCount]; + delete this.items[this.lowestCount]; + this.lowestCount++; + return result; + } + + peek() { + if (this.isEmpty()) { + return undefined; + } + return this.items[this.lowestCount]; + } + + isEmpty() { + return this.size() === 0; + } + + clear() { + this.items = {}; + this.count = 0; + this.lowestCount = 0; + } + + size() { + return this.count - this.lowestCount; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + let objString = `${this.items[this.lowestCount]}`; + for (let i = this.lowestCount + 1; i < this.count; i++) { + objString = `${objString},${this.items[i]}`; + } + return objString; + } +} diff --git a/src/js/data-structures/set.js b/src/js/data-structures/set.js new file mode 100644 index 00000000..996316ac --- /dev/null +++ b/src/js/data-structures/set.js @@ -0,0 +1,93 @@ +export default class Set { + constructor() { + this.items = {}; + } + + add(element) { + if (!this.has(element)) { + this.items[element] = element; + return true; + } + return false; + } + + delete(element) { + if (this.has(element)) { + delete this.items[element]; + return true; + } + return false; + } + + has(element) { + return Object.prototype.hasOwnProperty.call(this.items, element); + } + + values() { + return Object.values(this.items); + } + + union(otherSet) { + const unionSet = new Set(); + this.values().forEach(value => unionSet.add(value)); + otherSet.values().forEach(value => unionSet.add(value)); + return unionSet; + } + + intersection(otherSet) { + const intersectionSet = new Set(); + const values = this.values(); + const otherValues = otherSet.values(); + let biggerSet = values; + let smallerSet = otherValues; + if (otherValues.length - values.length > 0) { + biggerSet = otherValues; + smallerSet = values; + } + smallerSet.forEach(value => { + if (biggerSet.includes(value)) { + intersectionSet.add(value); + } + }); + return intersectionSet; + } + + difference(otherSet) { + const differenceSet = new Set(); + this.values().forEach(value => { + if (!otherSet.has(value)) { + differenceSet.add(value); + } + }); + return differenceSet; + } + + isSubsetOf(otherSet) { + const values = this.values(); + return values.every((value) => otherSet.has(value)); + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.items).length; + } + + clear() { + this.items = {}; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const values = this.values(); + let objString = `${values[0]}`; + for (let i = 1; i < values.length; i++) { + objString = `${objString},${values[i].toString()}`; + } + return objString; + } +} diff --git a/src/js/data-structures/sorted-linked-list.js b/src/js/data-structures/sorted-linked-list.js new file mode 100644 index 00000000..6712f6a8 --- /dev/null +++ b/src/js/data-structures/sorted-linked-list.js @@ -0,0 +1,40 @@ +import { Compare, defaultCompare, defaultEquals } from '../util'; +import LinkedList from './linked-list'; + +export default class SortedLinkedList extends LinkedList { + constructor(equalsFn = defaultEquals, compareFn = defaultCompare) { + super(equalsFn); + this.equalsFn = equalsFn; + this.compareFn = compareFn; + } + + push(element) { + if (this.isEmpty()) { + super.push(element); + } else { + const index = this.getIndexNextSortedElement(element); + super.insert(element, index); + } + } + + insert(element, index = 0) { + if (this.isEmpty()) { + return super.insert(element, index === 0 ? index : 0); + } + const pos = this.getIndexNextSortedElement(element); + return super.insert(element, pos); + } + + getIndexNextSortedElement(element) { + let current = this.head; + let i = 0; + for (; i < this.size() && current; i++) { + const comp = this.compareFn(element, current.element); + if (comp === Compare.LESS_THAN) { + return i; + } + current = current.next; + } + return i; + } +} diff --git a/src/js/data-structures/stack-array.js b/src/js/data-structures/stack-array.js index ec8642ad..1491eb2c 100644 --- a/src/js/data-structures/stack-array.js +++ b/src/js/data-structures/stack-array.js @@ -4,6 +4,7 @@ export default class StackArray { constructor() { this.items = []; } + push(element) { this.items.push(element); } diff --git a/src/js/data-structures/stack-linked-list.js b/src/js/data-structures/stack-linked-list.js new file mode 100644 index 00000000..902a5d78 --- /dev/null +++ b/src/js/data-structures/stack-linked-list.js @@ -0,0 +1,42 @@ +import DoublyLinkedList from './doubly-linked-list'; + +export default class StackLinkedList { + constructor() { + this.items = new DoublyLinkedList(); + } + + push(element) { + this.items.push(element); + } + + pop() { + if (this.isEmpty()) { + return undefined; + } + const result = this.items.removeAt(this.size() - 1); + return result; + } + + peek() { + if (this.isEmpty()) { + return undefined; + } + return this.items.getElementAt(this.size() - 1).element; + } + + isEmpty() { + return this.items.isEmpty(); + } + + size() { + return this.items.size(); + } + + clear() { + this.items.clear(); + } + + toString() { + return this.items.toString(); + } +} diff --git a/src/js/data-structures/stack.js b/src/js/data-structures/stack.js index 081bab33..af9b297b 100644 --- a/src/js/data-structures/stack.js +++ b/src/js/data-structures/stack.js @@ -5,10 +5,12 @@ export default class Stack { this.count = 0; this.items = {}; } + push(element) { this.items[this.count] = element; this.count++; } + pop() { if (this.isEmpty()) { return undefined; @@ -18,18 +20,22 @@ export default class Stack { delete this.items[this.count]; return result; } + peek() { if (this.isEmpty()) { return undefined; } return this.items[this.count - 1]; } + isEmpty() { return this.count === 0; } + size() { return this.count; } + clear() { /* while (!this.isEmpty()) { this.pop(); @@ -37,6 +43,7 @@ export default class Stack { this.items = {}; this.count = 0; } + toString() { if (this.isEmpty()) { return ''; diff --git a/src/js/index.js b/src/js/index.js index 198a42e2..fa359f81 100644 --- a/src/js/index.js +++ b/src/js/index.js @@ -1,15 +1,98 @@ -import { hanoi, hanoiStack } from './others/hanoi'; -import { baseConverter, decimalToBinary } from './others/base-converter'; -import StackArray from './data-structures/stack-array'; -import Stack from './data-structures/stack'; -import { parenthesesChecker } from './others/balanced-symbols'; - -export { - Stack, - StackArray, - parenthesesChecker, - baseConverter, - decimalToBinary, - hanoi, - hanoiStack -}; +import * as _util from './util'; + +// chapters 05 and 07 +export const util = _util; + +// chapter 03 +export { default as StackArray } from './data-structures/stack-array'; +export { default as Stack } from './data-structures/stack'; +export { hanoi } from './others/hanoi'; +export { hanoiStack } from './others/hanoi'; +export { baseConverter } from './others/base-converter'; +export { decimalToBinary } from './others/base-converter'; +export { parenthesesChecker } from './others/balanced-symbols'; + +// chapter 04 +export { default as Queue } from './data-structures/queue'; +export { default as Deque } from './data-structures/deque'; +export { hotPotato } from './others/hot-potato'; +export { palindromeChecker } from './others/palindrome-checker'; + +// chapter 05 +export { default as LinkedList } from './data-structures/linked-list'; +export { default as DoublyLinkedList } from './data-structures/doubly-linked-list'; +export { default as CircularLinkedList } from './data-structures/circular-linked-list'; +export { default as SortedLinkedList } from './data-structures/sorted-linked-list'; +export { default as StackLinkedList } from './data-structures/stack-linked-list'; + +// chapter 06 +export { default as Set } from './data-structures/set'; + +// chapter 07 +export { default as Dictionary } from './data-structures/dictionary'; +export { default as HashTable } from './data-structures/hash-table'; +export { default as HashTableSeparateChaining } from './data-structures/hash-table-separate-chaining'; +export { default as HashTableLinearProbing } from './data-structures/hash-table-linear-probing'; +export { default as HashTableLinearProbingLazy } from './data-structures/hash-table-linear-probing-lazy'; + +// chapter 08 +export { factorialIterative } from './others/factorial'; +export { factorial } from './others/factorial'; +export { fibonacci } from './others/fibonacci'; +export { fibonacciIterative } from './others/fibonacci'; +export { fibonacciMemoization } from './others/fibonacci'; + +// chapter 09 +export { default as BinarySearchTree } from './data-structures/binary-search-tree'; +export { default as AVLTree } from './data-structures/avl-tree'; + +// chapter 10 +export { MinHeap } from './data-structures/heap'; +export { MaxHeap } from './data-structures/heap'; +export { default as heapSort } from './algorithms/sorting/heap-sort'; + +// chapter 11 +export { default as Graph } from './data-structures/graph'; +export { breadthFirstSearch } from './algorithms/graph/breadth-first-search'; +export { BFS } from './algorithms/graph/breadth-first-search'; +export { depthFirstSearch } from './algorithms/graph/depth-first-search'; +export { DFS } from './algorithms/graph/depth-first-search'; +export { dijkstra } from './algorithms/graph/dijkstra'; +export { floydWarshall } from './algorithms/graph/floyd-warshall'; +export { prim } from './algorithms/graph/prim'; +export { kruskal } from './algorithms/graph/kruskal'; + +// chapter 12 +export { shuffle } from './algorithms/shuffle/fisher–yates'; + +export { bubbleSort } from './algorithms/sorting/bubble-sort'; +export { modifiedBubbleSort } from './algorithms/sorting/bubble-sort-improved'; +export { bucketSort } from './algorithms/sorting/bucket-sort'; +export { countingSort } from './algorithms/sorting/counting-sort'; +export { insertionSort } from './algorithms/sorting/insertion-sort'; +export { mergeSort } from './algorithms/sorting/merge-sort'; +export { quickSort } from './algorithms/sorting/quicksort'; +export { radixSort } from './algorithms/sorting/radix-sort'; +export { selectionSort } from './algorithms/sorting/selection-sort'; +export { shellSort } from './algorithms/sorting/shell-sort'; + +export { binarySearch } from './algorithms/search/binary-search'; +export { interpolationSearch } from './algorithms/search/interpolation-search'; +export { sequentialSearch } from './algorithms/search/sequential-search'; +export { findMaxValue } from './algorithms/search/min-max-search'; +export { findMinValue } from './algorithms/search/min-max-search'; + +// chapter 14 +export { binarySearch as binarySearchRecursive } from './algorithms/search/binary-search-recursive'; +export { minCoinChange } from './algorithms/dynamic-programing/min-coin-change'; +export { minCoinChange as minCoinChangeGreedy } from './algorithms/greedy/min-coin-change'; +export { knapSack } from './algorithms/dynamic-programing/knapsack'; +export { knapSack as knapSackRecursive } from './algorithms/dynamic-programing/knapsack-recursive'; +export { knapSack as knapSackGreedy } from './algorithms/greedy/knapsack'; +export { lcs } from './algorithms/dynamic-programing/longest-common-subsequence'; +export { lcs as lcsPrint } from './algorithms/dynamic-programing/longest-common-subsequence-print'; +export { lcs as lcsRecursive } from './algorithms/greedy/longest-common-subsequence'; +export { matrixChainOrder } from './algorithms/dynamic-programing/matrix-chain-multiplication'; +export { matrixChainOrder as matrixChainOrderGreedy } from './algorithms/greedy/matrix-chain-multiplication'; +export { ratInAMaze } from './algorithms/backtracking/rat-in-maze'; +export { sudokuSolver } from './algorithms/backtracking/sudoku-solver'; diff --git a/src/js/others/balanced-symbols.js b/src/js/others/balanced-symbols.js index ef1435ad..70bcd27d 100644 --- a/src/js/others/balanced-symbols.js +++ b/src/js/others/balanced-symbols.js @@ -11,7 +11,7 @@ export function parenthesesChecker(symbols) { let top; while (index < symbols.length && balanced) { - symbol = symbols.charAt(index); + symbol = symbols[index]; if (opens.indexOf(symbol) >= 0) { stack.push(symbol); } else if (stack.isEmpty()) { @@ -24,8 +24,5 @@ export function parenthesesChecker(symbols) { } index++; } - if (balanced && stack.isEmpty()) { - return true; - } - return false; + return balanced && stack.isEmpty(); } diff --git a/src/js/others/factorial.js b/src/js/others/factorial.js new file mode 100644 index 00000000..8592c36e --- /dev/null +++ b/src/js/others/factorial.js @@ -0,0 +1,20 @@ +export function factorialIterative(number) { + if (number < 0) { + return undefined; + } + let total = 1; + for (let n = number; n > 1; n--) { + total *= n; + } + return total; +} + +export function factorial(n) { + if (n < 0) { + return undefined; + } + if (n === 1 || n === 0) { + return 1; + } + return n * factorial(n - 1); +} diff --git a/src/js/others/fibonacci.js b/src/js/others/fibonacci.js new file mode 100644 index 00000000..e0ded2f9 --- /dev/null +++ b/src/js/others/fibonacci.js @@ -0,0 +1,32 @@ +export function fibonacci(n) { + if (n < 1) { + return 0; + } + if (n <= 2) { + return 1; + } + return fibonacci(n - 1) + fibonacci(n - 2); +} + +export function fibonacciIterative(n) { + if (n < 1) { return 0; } + let fibNMinus2 = 0; + let fibNMinus1 = 1; + let fibN = n; + for (let i = 2; i <= n; i++) { + fibN = fibNMinus1 + fibNMinus2; + fibNMinus2 = fibNMinus1; + fibNMinus1 = fibN; + } + return fibN; +} + +export function fibonacciMemoization(n) { + if (n < 1) { return 0; } + const memo = [0, 1]; + const fibonacciMem = num => { + if (memo[num] != null) { return memo[num]; } + return (memo[num] = fibonacciMem(num - 1) + fibonacciMem(num - 2)); + }; + return fibonacciMem(n); +} diff --git a/src/js/others/hot-potato.js b/src/js/others/hot-potato.js new file mode 100644 index 00000000..b34fcc64 --- /dev/null +++ b/src/js/others/hot-potato.js @@ -0,0 +1,22 @@ +import Queue from '../data-structures/queue'; + +export function hotPotato(elementsList, num) { + const queue = new Queue(); + const elimitatedList = []; + + for (let i = 0; i < elementsList.length; i++) { + queue.enqueue(elementsList[i]); + } + + while (queue.size() > 1) { + for (let i = 0; i < num; i++) { + queue.enqueue(queue.dequeue()); + } + elimitatedList.push(queue.dequeue()); + } + + return { + eliminated: elimitatedList, + winner: queue.dequeue() + }; +} diff --git a/src/js/others/palindrome-checker.js b/src/js/others/palindrome-checker.js new file mode 100644 index 00000000..1551e26a --- /dev/null +++ b/src/js/others/palindrome-checker.js @@ -0,0 +1,29 @@ +import Deque from '../data-structures/deque'; + +export function palindromeChecker(aString) { + if ( + aString === undefined + || aString === null + || (aString !== null && aString.length === 0) + ) { + return false; + } + const deque = new Deque(); + const lowerString = aString.toLocaleLowerCase().split(' ').join(''); + let firstChar; + let lastChar; + + for (let i = 0; i < lowerString.length; i++) { + deque.addBack(lowerString.charAt(i)); + } + + while (deque.size() > 1) { + firstChar = deque.removeFront(); + lastChar = deque.removeBack(); + if (firstChar !== lastChar) { + return false; + } + } + + return true; +} diff --git a/src/js/util.js b/src/js/util.js new file mode 100644 index 00000000..9e780fba --- /dev/null +++ b/src/js/util.js @@ -0,0 +1,53 @@ +export const Compare = { + LESS_THAN: -1, + BIGGER_THAN: 1, + EQUALS: 0 +}; + +export const DOES_NOT_EXIST = -1; + +export function lesserEquals(a, b, compareFn) { + const comp = compareFn(a, b); + return comp === Compare.LESS_THAN || comp === Compare.EQUALS; +} + +export function biggerEquals(a, b, compareFn) { + const comp = compareFn(a, b); + return comp === Compare.BIGGER_THAN || comp === Compare.EQUALS; +} + +export function defaultCompare(a, b) { + if (a === b) { + return Compare.EQUALS; + } + return a < b ? Compare.LESS_THAN : Compare.BIGGER_THAN; +} + +export function defaultEquals(a, b) { + return a === b; +} + +export function defaultToString(item) { + if (item === null) { + return 'NULL'; + } if (item === undefined) { + return 'UNDEFINED'; + } if (typeof item === 'string' || item instanceof String) { + return `${item}`; + } + return item.toString(); +} + +export function swap(array, a, b) { + /* const temp = array[a]; + array[a] = array[b]; + array[b] = temp; */ + [array[a], array[b]] = [array[b], array[a]]; +} +export function reverseCompare(compareFn) { + return (a, b) => compareFn(b, a); +} + +export function defaultDiff(a, b) { + return Number(a) - Number(b); +} diff --git a/src/ts/algorithms/backtracking/rat-in-maze.ts b/src/ts/algorithms/backtracking/rat-in-maze.ts new file mode 100644 index 00000000..047d4982 --- /dev/null +++ b/src/ts/algorithms/backtracking/rat-in-maze.ts @@ -0,0 +1,54 @@ +export function ratInAMaze(maze: Array>) { + const solution: Array> = []; + + for (let i = 0; i < maze.length; i++) { + solution[i] = []; + for (let j = 0; j < maze[i].length; j++) { + solution[i][j] = 0; + } + } + + if (findPath(maze, 0, 0, solution) === true) { + return solution; + } else { + return 'NO PATH FOUND'; + } +} + +function findPath( + maze: Array>, + x: number, + y: number, + solution: Array> +) { + const n = maze.length; + if (x === n - 1 && y === n - 1) { + solution[x][y] = 1; + return true; + } + + if (isSafe(maze, x, y) === true) { + solution[x][y] = 1; + + if (findPath(maze, x + 1, y, solution)) { + return true; + } + + if (findPath(maze, x, y + 1, solution)) { + return true; + } + + solution[x][y] = 0; + return false; + } + + return false; +} + +function isSafe(maze: Array>, x: number, y: number) { + const n = maze.length; + if (x >= 0 && y >= 0 && x < n && y < n && maze[x][y] !== 0) { + return true; + } + return false; +} diff --git a/src/ts/algorithms/backtracking/sudoku-solver.ts b/src/ts/algorithms/backtracking/sudoku-solver.ts new file mode 100644 index 00000000..3ada1069 --- /dev/null +++ b/src/ts/algorithms/backtracking/sudoku-solver.ts @@ -0,0 +1,87 @@ +const UNASSIGNED = 0; + +export function sudokuSolver(grid: Array>) { + if (solveSudoku(grid) === true) { + return grid; + } else { + return 'NO SOLUTION EXISTS!'; + } +} + +function solveSudoku(grid: Array>) { + let row = 0; + let col = 0; + let checkBlankSpaces = false; + + for (row = 0; row < grid.length; row++) { + for (col = 0; col < grid[row].length; col++) { + if (grid[row][col] === UNASSIGNED) { + checkBlankSpaces = true; + break; + } + } + if (checkBlankSpaces === true) { + break; + } + } + + if (checkBlankSpaces === false) { + return true; + } + + for (let num = 1; num <= 9; num++) { + if (isSafe(grid, row, col, num)) { + grid[row][col] = num; + + if (solveSudoku(grid)) { + return true; + } + + grid[row][col] = UNASSIGNED; + } + } + + return false; +} + +function usedInRow(grid: Array>, row: number, num: number) { + for (let col = 0; col < grid.length; col++) { + if (grid[row][col] === num) { + return true; + } + } + return false; +} + +function usedInCol(grid: Array>, col: number, num: number) { + for (let row = 0; row < grid.length; row++) { + if (grid[row][col] === num) { + return true; + } + } + return false; +} + +function usedInBox( + grid: Array>, + boxStartRow: number, + boxStartCol: number, + num: number +) { + for (let row = 0; row < 3; row++) { + for (let col = 0; col < 3; col++) { + if (grid[row + boxStartRow][col + boxStartCol] === num) { + return true; + } + } + } + return false; +} + +function isSafe(grid: Array>, row: number, col: number, num: number) { + return ( + !usedInRow(grid, row, num) && + !usedInCol(grid, col, num) && + !usedInBox(grid, row - row % 3, col - col % 3, num) + ); +} diff --git a/src/ts/algorithms/dynamic-programing/knapsack-recursive.ts b/src/ts/algorithms/dynamic-programing/knapsack-recursive.ts new file mode 100644 index 00000000..0fce59a5 --- /dev/null +++ b/src/ts/algorithms/dynamic-programing/knapsack-recursive.ts @@ -0,0 +1,13 @@ +export function knapSack(capacity: number, weights: number[], values: number[], n: number): number { + if (n === 0 || capacity === 0) { + return 0; + } + + if (weights[n - 1] > capacity) { + return knapSack(capacity, weights, values, n - 1); + } else { + const a: number = values[n - 1] + knapSack(capacity - weights[n - 1], weights, values, n - 1); + const b: number = knapSack(capacity, weights, values, n - 1); + return a > b ? a : b; + } +} diff --git a/src/ts/algorithms/dynamic-programing/knapsack.ts b/src/ts/algorithms/dynamic-programing/knapsack.ts new file mode 100644 index 00000000..bfa42398 --- /dev/null +++ b/src/ts/algorithms/dynamic-programing/knapsack.ts @@ -0,0 +1,51 @@ +export function knapSack(capacity: number, weights: number[], values: number[], n: number) { + const kS: Array> = []; + + for (let i = 0; i <= n; i++) { + kS[i] = []; + } + + for (let i = 0; i <= n; i++) { + for (let w = 0; w <= capacity; w++) { + if (i === 0 || w === 0) { + kS[i][w] = 0; + } else if (weights[i - 1] <= w) { + const a = values[i - 1] + kS[i - 1][w - weights[i - 1]]; + const b = kS[i - 1][w]; + kS[i][w] = a > b ? a : b; // max(a,b) + // console.log(a + ' can be part of the solution'); + } else { + kS[i][w] = kS[i - 1][w]; + } + } + // console.log(kS[i].join()); + } + + // extra algorithm to find the items that are part of the solution + findValues(n, capacity, kS); + + return kS[n][capacity]; +} + +function findValues( + n: number, + capacity: number, + kS: Array> +) { + let i = n; + let k = capacity; + + // console.log('Items that are part of the solution:'); + + while (i > 0 && k > 0) { + if (kS[i][k] !== kS[i - 1][k]) { + /* console.log( + 'item ' + i + ' can be part of solution w,v: ' + weights[i - 1] + ',' + values[i - 1] + ); */ + i--; + k = k - kS[i][k]; + } else { + i--; + } + } +} diff --git a/src/ts/algorithms/dynamic-programing/longest-common-subsequence-print.ts b/src/ts/algorithms/dynamic-programing/longest-common-subsequence-print.ts new file mode 100644 index 00000000..7c26b986 --- /dev/null +++ b/src/ts/algorithms/dynamic-programing/longest-common-subsequence-print.ts @@ -0,0 +1,60 @@ +export function lcs(wordX: string, wordY: string) { + const m = wordX.length; + const n = wordY.length; + const l: Array> = []; + const solution: Array> = []; + + for (let i = 0; i <= m; i++) { + l[i] = []; + solution[i] = []; + for (let j = 0; j <= n; j++) { + l[i][j] = 0; + solution[i][j] = '0'; + } + } + + for (let i = 0; i <= m; i++) { + for (let j = 0; j <= n; j++) { + if (i === 0 || j === 0) { + l[i][j] = 0; + } else if (wordX[i - 1] === wordY[j - 1]) { + l[i][j] = l[i - 1][j - 1] + 1; + solution[i][j] = 'diagonal'; + } else { + const a = l[i - 1][j]; + const b = l[i][j - 1]; + l[i][j] = a > b ? a : b; // max(a,b) + solution[i][j] = l[i][j] === l[i - 1][j] ? 'top' : 'left'; + } + } + // console.log(l[i].join()); + // console.log(solution[i].join()); + } + + return printSolution(solution, wordX, m, n); + + // return l[m][n]; +} + +function printSolution(solution: Array>, wordX: string, m: number, n: number) { + let a = m; + let b = n; + let x = solution[a][b]; + let answer = ''; + + while (x !== '0') { + if (solution[a][b] === 'diagonal') { + answer = wordX[a - 1] + answer; + a--; + b--; + } else if (solution[a][b] === 'left') { + b--; + } else if (solution[a][b] === 'top') { + a--; + } + x = solution[a][b]; + } + + return answer; + // console.log('lcs: ' + answer); +} diff --git a/src/ts/algorithms/dynamic-programing/longest-common-subsequence.ts b/src/ts/algorithms/dynamic-programing/longest-common-subsequence.ts new file mode 100644 index 00000000..9aa48054 --- /dev/null +++ b/src/ts/algorithms/dynamic-programing/longest-common-subsequence.ts @@ -0,0 +1,29 @@ +export function lcs(wordX: string, wordY: string) { + const m = wordX.length; + const n = wordY.length; + const l: Array> = []; + + for (let i = 0; i <= m; i++) { + l[i] = []; + for (let j = 0; j <= n; j++) { + l[i][j] = 0; + } + } + + for (let i = 0; i <= m; i++) { + for (let j = 0; j <= n; j++) { + if (i === 0 || j === 0) { + l[i][j] = 0; + } else if (wordX[i - 1] === wordY[j - 1]) { + l[i][j] = l[i - 1][j - 1] + 1; + } else { + const a = l[i - 1][j]; + const b = l[i][j - 1]; + l[i][j] = a > b ? a : b; // max(a,b) + } + } + // console.log(l[i].join()); + } + + return l[m][n]; +} diff --git a/src/ts/algorithms/dynamic-programing/matrix-chain-multiplication.ts b/src/ts/algorithms/dynamic-programing/matrix-chain-multiplication.ts new file mode 100644 index 00000000..c2743ec5 --- /dev/null +++ b/src/ts/algorithms/dynamic-programing/matrix-chain-multiplication.ts @@ -0,0 +1,52 @@ +export function matrixChainOrder(p: number[]): number { + const n = p.length; + + const m: Array> = []; + const s: Array> = []; + + for (let i = 1; i <= n; i++) { + m[i] = []; + m[i][i] = 0; + } + + for (let i = 0; i <= n; i++) { + // to help printing the optimal solution + s[i] = []; // auxiliary + for (let j = 0; j <= n; j++) { + s[i][j] = 0; + } + } + + for (let l = 2; l < n; l++) { + for (let i = 1; i <= n - l + 1; i++) { + const j = i + l - 1; + m[i][j] = Number.MAX_SAFE_INTEGER; + for (let k = i; k <= j - 1; k++) { + // q = cost/scalar multiplications + const q = m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j]; + if (q < m[i][j]) { + m[i][j] = q; + s[i][j] = k; // s[i,j] = Second auxiliary table that stores k + } + } + } + } + + // console.log(m); + // console.log(s); + + printOptimalParenthesis(s, 1, n - 1); + + return m[1][n - 1]; +} + +function printOptimalParenthesis(s: Array>, i: number, j: number) { + if (i === j) { + // console.log('A[' + i + ']'); + } else { + // console.log('('); + printOptimalParenthesis(s, i, s[i][j]); + printOptimalParenthesis(s, s[i][j] + 1, j); + // console.log(')'); + } +} diff --git a/src/ts/algorithms/dynamic-programing/min-coin-change.ts b/src/ts/algorithms/dynamic-programing/min-coin-change.ts new file mode 100644 index 00000000..85baeb83 --- /dev/null +++ b/src/ts/algorithms/dynamic-programing/min-coin-change.ts @@ -0,0 +1,34 @@ +export function minCoinChange(coins: number[], amount: number) { + const cache: Array> = []; + + // tslint:disable-next-line:no-shadowed-variable + const makeChange = function(amount: number) { + if (!amount) { + return []; + } + if (cache[amount]) { + return cache[amount]; + } + let min: number[] = [], + newMin, + newAmount; + for (let i = 0; i < coins.length; i++) { + const coin = coins[i]; + newAmount = amount - coin; + if (newAmount >= 0) { + newMin = makeChange(newAmount); + } + if ( + newAmount >= 0 && + (newMin.length < min.length - 1 || !min.length) && + (newMin.length || !newAmount) + ) { + min = [coin].concat(newMin); + // console.log('new Min ' + min + ' for ' + amount); + } + } + return (cache[amount] = min); + }; + + return makeChange(amount); +} diff --git a/src/ts/algorithms/graph/breadth-first-search.ts b/src/ts/algorithms/graph/breadth-first-search.ts new file mode 100644 index 00000000..95438007 --- /dev/null +++ b/src/ts/algorithms/graph/breadth-first-search.ts @@ -0,0 +1,78 @@ +import Graph from '../../data-structures/graph'; +import Queue from '../../data-structures/queue'; + +enum Colors { + WHITE = 0, + GREY = 1, + BLACK = 2 +} + +const initializeColor = (vertices: (string | number)[]) => { + const color: any = {}; + for (let i = 0; i < vertices.length; i++) { + color[vertices[i]] = Colors.WHITE; + } + return color; +}; + +export const breadthFirstSearch = (graph: Graph, startVertex: any, callback: Function) => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + const queue = new Queue(); + + queue.enqueue(startVertex); + + while (!queue.isEmpty()) { + const u = queue.dequeue(); + const neighbors = adjList.get(u); + color[u] = Colors.GREY; + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + color[w] = Colors.GREY; + queue.enqueue(w); + } + } + color[u] = Colors.BLACK; + if (callback) { + callback(u); + } + } +}; + +export const bfs = (graph: Graph, startVertex: any) => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + const queue = new Queue(); + const distances: any = {}; + const predecessors: any = {}; + queue.enqueue(startVertex); + + for (let i = 0; i < vertices.length; i++) { + distances[vertices[i]] = 0; + predecessors[vertices[i]] = null; + } + + while (!queue.isEmpty()) { + const u = queue.dequeue(), + neighbors = adjList.get(u); + color[u] = Colors.GREY; + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + color[w] = Colors.GREY; + distances[w] = distances[u] + 1; + predecessors[w] = u; + queue.enqueue(w); + } + } + color[u] = Colors.BLACK; + } + + return { + distances: distances, + predecessors: predecessors + }; +}; diff --git a/src/ts/algorithms/graph/depth-first-search.ts b/src/ts/algorithms/graph/depth-first-search.ts new file mode 100644 index 00000000..de47c93f --- /dev/null +++ b/src/ts/algorithms/graph/depth-first-search.ts @@ -0,0 +1,102 @@ +import Graph from '../../data-structures/graph'; + +enum Colors { + WHITE = 0, + GREY = 1, + BLACK = 2 +} + +const initializeColor = (vertices: (string | number)[]) => { + const color: any = {}; + for (let i = 0; i < vertices.length; i++) { + color[vertices[i]] = Colors.WHITE; + } + return color; +}; + +const depthFirstSearchVisit = ( + u: string | number, + color: any, + adjList: any, + callback: Function +) => { + color[u] = 'grey'; + if (callback) { + callback(u); + } + // console.log('Discovered ' + u); + const neighbors = adjList.get(u); + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + depthFirstSearchVisit(w, color, adjList, callback); + } + } + color[u] = Colors.BLACK; + // console.log('explored ' + u); +}; + +export const depthFirstSearch = (graph: Graph, callback: Function) => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + + for (let i = 0; i < vertices.length; i++) { + if (color[vertices[i]] === Colors.WHITE) { + depthFirstSearchVisit(vertices[i], color, adjList, callback); + } + } +}; + +const DFSVisit = ( + u: string | number, + color: any, + d: any, + f: any, + p: any, + time: any, + adjList: any +) => { + // console.log('discovered ' + u); + color[u] = Colors.GREY; + d[u] = ++time.count; + const neighbors = adjList.get(u); + for (let i = 0; i < neighbors.length; i++) { + const w = neighbors[i]; + if (color[w] === Colors.WHITE) { + p[w] = u; + DFSVisit(w, color, d, f, p, time, adjList); + } + } + color[u] = Colors.BLACK; + f[u] = ++time.count; + // console.log('explored ' + u); +}; + +export const DFS = (graph: Graph) => { + const vertices = graph.getVertices(); + const adjList = graph.getAdjList(); + const color = initializeColor(vertices); + const d: any = {}; + const f: any = {}; + const p: any = {}; + const time = { count: 0 }; + + for (let i = 0; i < vertices.length; i++) { + f[vertices[i]] = 0; + d[vertices[i]] = 0; + p[vertices[i]] = null; + } + + for (let i = 0; i < vertices.length; i++) { + if (color[vertices[i]] === Colors.WHITE) { + DFSVisit(vertices[i], color, d, f, p, time, adjList); + } + } + + return { + discovery: d, + finished: f, + predecessors: p + }; +}; diff --git a/src/ts/algorithms/graph/dijkstra.ts b/src/ts/algorithms/graph/dijkstra.ts new file mode 100644 index 00000000..a3dd4752 --- /dev/null +++ b/src/ts/algorithms/graph/dijkstra.ts @@ -0,0 +1,42 @@ +const INF = Number.MAX_SAFE_INTEGER; + +const minDistance = (dist: number[], visited: boolean[]) => { + let min = INF; + let minIndex = -1; + + for (let v = 0; v < dist.length; v++) { + if (visited[v] === false && dist[v] <= min) { + min = dist[v]; + minIndex = v; + } + } + + return minIndex; +}; + +export const dijkstra = (graph: number[][], src: number) => { + const dist: number[] = []; + const visited: boolean[] = []; + const length = graph.length; + + for (let i = 0; i < length; i++) { + dist[i] = INF; + visited[i] = false; + } + + dist[src] = 0; + + for (let i = 0; i < length - 1; i++) { + const u = minDistance(dist, visited); + + visited[u] = true; + + for (let v = 0; v < length; v++) { + if (!visited[v] && graph[u][v] !== 0 && dist[u] !== INF && dist[u] + graph[u][v] < dist[v]) { + dist[v] = dist[u] + graph[u][v]; + } + } + } + + return dist; +}; diff --git a/src/ts/algorithms/graph/floyd-warshall.ts b/src/ts/algorithms/graph/floyd-warshall.ts new file mode 100644 index 00000000..7699c6e8 --- /dev/null +++ b/src/ts/algorithms/graph/floyd-warshall.ts @@ -0,0 +1,29 @@ +export const floydWarshall = (graph: number[][]) => { + const dist: number[][] = []; + const length = graph.length; + + for (let i = 0; i < length; i++) { + dist[i] = []; + for (let j = 0; j < length; j++) { + if (i === j) { + dist[i][j] = 0; + } else if (!isFinite(graph[i][j])) { + dist[i][j] = Infinity; + } else { + dist[i][j] = graph[i][j]; + } + } + } + + for (let k = 0; k < length; k++) { + for (let i = 0; i < length; i++) { + for (let j = 0; j < length; j++) { + if (dist[i][k] + dist[k][j] < dist[i][j]) { + dist[i][j] = dist[i][k] + dist[k][j]; + } + } + } + } + + return dist; +}; diff --git a/src/ts/algorithms/graph/kruskal.ts b/src/ts/algorithms/graph/kruskal.ts new file mode 100644 index 00000000..978b1e3b --- /dev/null +++ b/src/ts/algorithms/graph/kruskal.ts @@ -0,0 +1,67 @@ +const INF = Number.MAX_SAFE_INTEGER; + +const find = (i: number, parent: number[]) => { + while (parent[i]) { + i = parent[i]; + } + return i; +}; + +const union = (i: number, j: number, parent: number[]) => { + if (i !== j) { + parent[j] = i; + return true; + } + return false; +}; + +const initializeCost = (graph: number[][]) => { + const cost: number[][] = []; + const length = graph.length; + for (let i = 0; i < length; i++) { + cost[i] = []; + for (let j = 0; j < length; j++) { + if (graph[i][j] === 0) { + cost[i][j] = INF; + } else { + cost[i][j] = graph[i][j]; + } + } + } + return cost; +}; + +export const kruskal = (graph: number[][]) => { + const length = graph.length; + const parent: number[] = []; + let ne = 0; + let a; + let b; + let u; + let v; + + const cost = initializeCost(graph); + + while (ne < length - 1) { + for (let i = 0, min = INF; i < length; i++) { + for (let j = 0; j < length; j++) { + if (cost[i][j] < min) { + min = cost[i][j]; + a = u = i; + b = v = j; + } + } + } + + u = find(u, parent); + v = find(v, parent); + + if (union(u, v, parent)) { + ne++; + } + + cost[a][b] = cost[b][a] = INF; + } + + return parent; +}; diff --git a/src/ts/algorithms/graph/prim.ts b/src/ts/algorithms/graph/prim.ts new file mode 100644 index 00000000..85892d03 --- /dev/null +++ b/src/ts/algorithms/graph/prim.ts @@ -0,0 +1,45 @@ +const INF = Number.MAX_SAFE_INTEGER; + +const minKey = (graph: number[][], key: number[], visited: boolean[]) => { + // Initialize min value + let min = INF; + let minIndex = 0; + + for (let v = 0; v < graph.length; v++) { + if (visited[v] === false && key[v] < min) { + min = key[v]; + minIndex = v; + } + } + + return minIndex; +}; + +export const prim = (graph: number[][]) => { + const parent: number[] = []; + const key: number[] = []; + const visited: boolean[] = []; + const length = graph.length; + + for (let i = 0; i < length; i++) { + key[i] = INF; + visited[i] = false; + } + + key[0] = 0; + parent[0] = -1; + + for (let i = 0; i < length - 1; i++) { + const u = minKey(graph, key, visited); + visited[u] = true; + + for (let v = 0; v < length; v++) { + if (graph[u][v] && visited[v] === false && graph[u][v] < key[v]) { + parent[v] = u; + key[v] = graph[u][v]; + } + } + } + + return parent; +}; diff --git a/src/ts/algorithms/greedy/knapsack.ts b/src/ts/algorithms/greedy/knapsack.ts new file mode 100644 index 00000000..101ebae5 --- /dev/null +++ b/src/ts/algorithms/greedy/knapsack.ts @@ -0,0 +1,19 @@ +export function knapSack(capacity: number, weights: number[], values: number[]) { + const n = values.length; + let load = 0; + let val = 0; + + for (let i = 0; i < n && load < capacity; i++) { + if (weights[i] <= capacity - load) { + val += values[i]; + load += weights[i]; + // console.log('using item ' + (i + 1) + ' for the solution'); + } else { + const r = (capacity - load) / weights[i]; + val += r * values[i]; + load += weights[i]; + // console.log('using ratio of ' + r + ' for item ' + (i + 1) + ' for the solution'); + } + } + return val; +} diff --git a/src/ts/algorithms/greedy/longest-common-subsequence.ts b/src/ts/algorithms/greedy/longest-common-subsequence.ts new file mode 100644 index 00000000..a7239f66 --- /dev/null +++ b/src/ts/algorithms/greedy/longest-common-subsequence.ts @@ -0,0 +1,13 @@ +export function lcs(wordX: string, wordY: string, m = wordX.length, n = wordY.length): number { + if (m === 0 || n === 0) { + return 0; + } + + if (wordX[m - 1] === wordY[n - 1]) { + return 1 + lcs(wordX, wordY, m - 1, n - 1); + } else { + const a = lcs(wordX, wordY, m, n - 1); + const b = lcs(wordX, wordY, m - 1, n); + return a > b ? a : b; + } +} diff --git a/src/ts/algorithms/greedy/matrix-chain-multiplication.ts b/src/ts/algorithms/greedy/matrix-chain-multiplication.ts new file mode 100644 index 00000000..fc23fced --- /dev/null +++ b/src/ts/algorithms/greedy/matrix-chain-multiplication.ts @@ -0,0 +1,18 @@ +export function matrixChainOrder(p: number[], i = 1, j = p.length - 1): number { + if (i === j) { + return 0; + } + + let min = Number.MAX_SAFE_INTEGER; + + for (let k = i; k < j; k++) { + const count = + matrixChainOrder(p, i, k) + matrixChainOrder(p, k + 1, j) + p[i - 1] * p[k] * p[j]; + + if (count < min) { + min = count; + } + } + + return min; +} diff --git a/src/ts/algorithms/greedy/min-coin-change.ts b/src/ts/algorithms/greedy/min-coin-change.ts new file mode 100644 index 00000000..14f3fbf6 --- /dev/null +++ b/src/ts/algorithms/greedy/min-coin-change.ts @@ -0,0 +1,12 @@ +export function minCoinChange(coins: number[], amount: number) { + const change: number[] = []; + let total = 0; + for (let i = coins.length; i >= 0; i--) { + const coin = coins[i]; + while (total + coin <= amount) { + change.push(coin); + total += coin; + } + } + return change; +} diff --git a/src/ts/algorithms/math/find-divisors.ts b/src/ts/algorithms/math/find-divisors.ts new file mode 100644 index 00000000..ea454418 --- /dev/null +++ b/src/ts/algorithms/math/find-divisors.ts @@ -0,0 +1,22 @@ +export const findDivisors = (num: number) => { + const divisors = []; + + const sqrt = Math.floor(Math.sqrt(num)); + + for (let i = 1; i <= sqrt; i++) { + if (num % i === 0) { + divisors.push(i); + if (i !== sqrt) { + divisors.push(Math.floor(num / i)); + } + } + } + + if (num >= 2 && !divisors.includes(num)) { + divisors.push(num); + } + + divisors.sort((a, b) => a - b); + + return divisors; +}; diff --git a/src/ts/algorithms/math/gcd.ts b/src/ts/algorithms/math/gcd.ts new file mode 100644 index 00000000..02a6fbbc --- /dev/null +++ b/src/ts/algorithms/math/gcd.ts @@ -0,0 +1,25 @@ +export const gcd = (num1: number, num2: number): number => { + if (num1 < 0 || num2 < 0) { + return gcd(Math.abs(num1), Math.abs(num2)); + } + if (num1 === 0) { + return num2; + } + if (num2 === 0) { + return num1; + } + if (num1 > num2) { + return gcd(num1 % num2, num2); + } + return gcd(num1, num2 % num1); +}; + +export const gcdArray = (num: number[]) => { + let result = num[0]; + + for (let i = 1; i < num.length; i++) { + result = gcd(num[i], result); + } + + return result; +}; diff --git a/src/ts/algorithms/math/greatest-difference.ts b/src/ts/algorithms/math/greatest-difference.ts new file mode 100644 index 00000000..a0412445 --- /dev/null +++ b/src/ts/algorithms/math/greatest-difference.ts @@ -0,0 +1,20 @@ +export const greatestDifference = (numbers: number[]) => { + let index = 0; + let largest = numbers[0]; + const length = numbers.length; + let number; + let smallest = numbers[0]; + + for (index; index < length; index++) { + number = numbers[index]; + + if (number > largest) { + largest = number; + } + if (number < smallest) { + smallest = number; + } + } + + return largest - smallest; +}; diff --git a/src/ts/algorithms/math/lcm.ts b/src/ts/algorithms/math/lcm.ts new file mode 100644 index 00000000..a4c4ac37 --- /dev/null +++ b/src/ts/algorithms/math/lcm.ts @@ -0,0 +1,20 @@ +import { gcd } from './gcd'; + +export const lcm = (num1: number, num2: number) => { + if (num1 === 0 || num2 === 0) { + return 0; + } + num1 = Math.abs(num1); + num2 = Math.abs(num2); + return (num1 * num2) / gcd(num1, num2); +}; + +export const lcmArray = (num: number[]) => { + let result = num[0]; + + for (let i = 1; i < num.length; i++) { + result = num[i] * result / gcd(num[i], result); + } + + return result; +}; diff --git a/src/ts/algorithms/math/primality-test.ts b/src/ts/algorithms/math/primality-test.ts new file mode 100644 index 00000000..f04e899d --- /dev/null +++ b/src/ts/algorithms/math/primality-test.ts @@ -0,0 +1,37 @@ +export const isPrime = (n: number) => { + if (n <= 1) { + return false; + } + + const sqrt = Math.floor(Math.sqrt(n)); + for (let i = 2; i <= sqrt; i++) { + if (n % i === 0) { + return false; + } + } + + return true; +}; + +export const testPrime = (n: number) => { + if (n <= 1) { + return false; + } else { + if (n === 2 || n === 3) { + return true; + } else if (n % 2 === 0) { + return false; + } else { + const sqrt = Math.floor(Math.sqrt(n)); + for (let i = 3; i <= sqrt; i += 2) { + if (n % i === 0) { + return false; + } + } + } + } + return true; +}; + +// tslint:disable-next-line:max-line-length +export const isPrime2 = (n: number) => (n >= 2) ? (![...Array(n).keys()].slice(2).map(i => !(n % i)).includes(true) && ![0, 1].includes(n)) : false; diff --git a/src/ts/algorithms/math/sieve-eratosthenes.ts b/src/ts/algorithms/math/sieve-eratosthenes.ts new file mode 100644 index 00000000..353389a1 --- /dev/null +++ b/src/ts/algorithms/math/sieve-eratosthenes.ts @@ -0,0 +1,27 @@ +export const sieveOfEratosthenes = (n: number) => { + + const sieve: boolean[] = []; + const primes: number[] = []; + + sieve[1] = false; + + for (let i = 2; i <= n; i++) { + sieve[i] = true; + } + + for (let p = 2; p * p <= n; p++) { + if (sieve[p]) { + for (let i = p * 2; i <= n; i += p) { + sieve[i] = false; + } + } + } + + sieve.forEach((value, index) => { + if (value) { + primes.push(index); + } + }, primes); + + return primes; +}; diff --git a/src/ts/algorithms/search/binary-search-recursive.ts b/src/ts/algorithms/search/binary-search-recursive.ts new file mode 100644 index 00000000..6d902139 --- /dev/null +++ b/src/ts/algorithms/search/binary-search-recursive.ts @@ -0,0 +1,32 @@ +import { Compare, defaultCompare, DOES_NOT_EXIST } from '../../util'; +import { quickSort } from '../sorting/quicksort'; + +function binarySearchRecursive( + array: T[], + value: T, + low: number, + high: number, + compareFn = defaultCompare +): number { + if (low <= high) { + const mid = Math.floor((low + high) / 2); + const element = array[mid]; + + if (compareFn(element, value) === Compare.LESS_THAN) { + return binarySearchRecursive(array, value, mid + 1, high, compareFn); + } else if (compareFn(element, value) === Compare.BIGGER_THAN) { + return binarySearchRecursive(array, value, low, mid - 1, compareFn); + } else { + return mid; + } + } + return DOES_NOT_EXIST; +} + +export function binarySearch(array: T[], value: T, compareFn = defaultCompare) { + const sortedArray = quickSort(array); + const low = 0; + const high = sortedArray.length - 1; + + return binarySearchRecursive(array, value, low, high, compareFn); +} diff --git a/src/ts/algorithms/search/binary-search.ts b/src/ts/algorithms/search/binary-search.ts new file mode 100644 index 00000000..2e8513bf --- /dev/null +++ b/src/ts/algorithms/search/binary-search.ts @@ -0,0 +1,25 @@ +import { Compare, defaultCompare, DOES_NOT_EXIST } from '../../util'; +import { quickSort } from '../sorting/quicksort'; + +export function binarySearch (array: T[], value: T, compareFn = defaultCompare) { + const sortedArray = quickSort(array); + let low = 0; + let high = sortedArray.length - 1; + + while (low <= high) { + const mid = Math.floor((low + high) / 2); + const element = sortedArray[mid]; + // console.log('mid element is ' + element); + if (compareFn(element, value) === Compare.LESS_THAN) { + low = mid + 1; + // console.log('low is ' + low); + } else if (compareFn(element, value) === Compare.BIGGER_THAN) { + high = mid - 1; + // console.log('high is ' + high); + } else { + // console.log('found it'); + return mid; + } + } + return DOES_NOT_EXIST; +} diff --git a/src/ts/algorithms/search/interpolation-search.ts b/src/ts/algorithms/search/interpolation-search.ts new file mode 100644 index 00000000..aebdeb09 --- /dev/null +++ b/src/ts/algorithms/search/interpolation-search.ts @@ -0,0 +1,41 @@ +import { + biggerEquals, + Compare, + defaultCompare, + defaultEquals, + defaultDiff, + DOES_NOT_EXIST, + lesserEquals +} from '../../util'; + +export function interpolationSearch( + array: T[], + value: T, + compareFn = defaultCompare, + equalsFn = defaultEquals, + diffFn = defaultDiff +) { + const { length } = array; + let low = 0; + let high = length - 1; + let position = -1; + let delta = -1; + while ( + low <= high && + biggerEquals(value, array[low], compareFn) && + lesserEquals(value, array[high], compareFn) + ) { + delta = diffFn(value, array[low]) / diffFn(array[high], array[low]); + position = low + Math.floor((high - low) * delta); + if (equalsFn(array[position], value)) { + return position; + } + if (compareFn(array[position], value) === Compare.LESS_THAN) { + low = position + 1; + } else { + high = position - 1; + } + } + + return DOES_NOT_EXIST; +} diff --git a/src/ts/algorithms/search/min-max-search.ts b/src/ts/algorithms/search/min-max-search.ts new file mode 100644 index 00000000..1869f412 --- /dev/null +++ b/src/ts/algorithms/search/min-max-search.ts @@ -0,0 +1,27 @@ +import { defaultCompare, Compare } from '../../util'; + +export function findMaxValue(array: T[], compareFn = defaultCompare) { + if (array && array.length > 0) { + let max = array[0]; + for (let i = 1; i < array.length; i++) { + if (compareFn(max, array[i]) === Compare.LESS_THAN) { + max = array[i]; + } + } + return max; + } + return undefined; +} + +export function findMinValue(array: T[], compareFn = defaultCompare) { + if (array && array.length > 0) { + let min = array[0]; + for (let i = 1; i < array.length; i++) { + if (compareFn(min, array[i]) === Compare.BIGGER_THAN) { + min = array[i]; + } + } + return min; + } + return undefined; +} diff --git a/src/ts/algorithms/search/sequential-search.ts b/src/ts/algorithms/search/sequential-search.ts new file mode 100644 index 00000000..ba9ddf6c --- /dev/null +++ b/src/ts/algorithms/search/sequential-search.ts @@ -0,0 +1,10 @@ +import { defaultEquals, DOES_NOT_EXIST, IEqualsFunction } from '../../util'; + +export function sequentialSearch(array: T[], value: T, equalsFn: IEqualsFunction = defaultEquals) { + for (let i = 0; i < array.length; i++) { + if (equalsFn(value, array[i])) { + return i; + } + } + return DOES_NOT_EXIST; +} diff --git "a/src/ts/algorithms/shuffle/fisher\342\200\223yates.ts" "b/src/ts/algorithms/shuffle/fisher\342\200\223yates.ts" new file mode 100644 index 00000000..b5869692 --- /dev/null +++ "b/src/ts/algorithms/shuffle/fisher\342\200\223yates.ts" @@ -0,0 +1,10 @@ +import { swap } from '../../util'; + +export function shuffle(array: T[]) { + for (let i = array.length - 1; i > 0; i--) { + const randomIndex = Math.floor(Math.random() * (i + 1)); + swap(array, i, randomIndex); + } + + return array; +} diff --git a/src/ts/algorithms/sorting/bubble-sort-improved.ts b/src/ts/algorithms/sorting/bubble-sort-improved.ts new file mode 100644 index 00000000..6e016d4d --- /dev/null +++ b/src/ts/algorithms/sorting/bubble-sort-improved.ts @@ -0,0 +1,18 @@ +import { Compare, defaultCompare, swap } from '../../util'; + +export function modifiedBubbleSort(array: T[], compareFn = defaultCompare) { + const { length } = array; + + for (let i = 0; i < length; i++) { + // console.log('--- '); + for (let j = 0; j < length - 1 - i; j++) { + // console.log('compare ' + array[j] + ' with ' + array[j + 1]); + if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) { + // console.log('swap ' + array[j] + ' with ' + array[j + 1]); + swap(array, j, j + 1); + } + } + } + + return array; +} diff --git a/src/ts/algorithms/sorting/bubble-sort.ts b/src/ts/algorithms/sorting/bubble-sort.ts new file mode 100644 index 00000000..41074f6f --- /dev/null +++ b/src/ts/algorithms/sorting/bubble-sort.ts @@ -0,0 +1,18 @@ +import { Compare, defaultCompare, swap } from '../../util'; + +export function bubbleSort(array: T[], compareFn = defaultCompare) { + const { length } = array; + + for (let i = 0; i < length; i++) { + // console.log('--- '); + for (let j = 0; j < length - 1; j++) { + // console.log('compare ' + array[j] + ' with ' + array[j + 1]); + if (compareFn(array[j], array[j + 1]) === Compare.BIGGER_THAN) { + // console.log('swap ' + array[j] + ' with ' + array[j + 1]); + swap(array, j, j + 1); + } + } + } + + return array; +} diff --git a/src/ts/algorithms/sorting/bucket-sort.ts b/src/ts/algorithms/sorting/bucket-sort.ts new file mode 100644 index 00000000..bcb8f61b --- /dev/null +++ b/src/ts/algorithms/sorting/bucket-sort.ts @@ -0,0 +1,48 @@ +import { insertionSort } from './insertion-sort'; + +function createBuckets(array: number[], bucketSize: number): number[][] { + let minValue = array[0]; + let maxValue = array[0]; + for (let i = 1; i < array.length; i++) { + if (array[i] < minValue) { + minValue = array[i]; + } else if (array[i] > maxValue) { + maxValue = array[i]; + } + } + + const bucketCount = Math.floor((maxValue - minValue) / bucketSize) + 1; + const buckets = []; + for (let i = 0; i < bucketCount; i++) { + buckets[i] = []; + } + + for (let i = 0; i < array.length; i++) { + buckets[Math.floor((array[i] - minValue) / bucketSize)].push(array[i]); + } + + return buckets; +} + +function sortBuckets(buckets: number[][]) { + const sortedArray = []; + for (let i = 0; i < buckets.length; i++) { + if (buckets[i] != null) { + insertionSort(buckets[i]); + + sortedArray.push(...buckets[i]); + } + } + + return sortedArray; +} + +export function bucketSort(array: number[], bucketSize = 5) { + if (array.length < 2) { + return array; + } + + const buckets = createBuckets(array, bucketSize); + + return sortBuckets(buckets); +} diff --git a/src/ts/algorithms/sorting/counting-sort.ts b/src/ts/algorithms/sorting/counting-sort.ts new file mode 100644 index 00000000..be3d9046 --- /dev/null +++ b/src/ts/algorithms/sorting/counting-sort.ts @@ -0,0 +1,30 @@ +import { findMaxValue } from '../search/min-max-search'; + +export function countingSort(array: number[]) { + + if (array.length < 2) { + return array; + } + + const maxValue = findMaxValue(array); + let sortedIndex = 0; + const counts = new Array(maxValue + 1); + + array.forEach(element => { + if (!counts[element]) { + counts[element] = 0; + } + counts[element]++; + }); + + // console.log('Frequencies: ' + counts.join()); + + counts.forEach((element, i) => { + while (element > 0) { + array[sortedIndex++] = i; + element--; + } + }); + + return array; +} diff --git a/src/ts/algorithms/sorting/heap-sort.ts b/src/ts/algorithms/sorting/heap-sort.ts new file mode 100644 index 00000000..7f461860 --- /dev/null +++ b/src/ts/algorithms/sorting/heap-sort.ts @@ -0,0 +1,37 @@ +import { defaultCompare, ICompareFunction, swap } from '../../util'; + +function heapify(array: any[], index: number, heapSize: number, compareFn: ICompareFunction) { + let largest = index; + const left = (2 * index) + 1; + const right = (2 * index) + 2; + + if (left < heapSize && compareFn(array[left], array[index]) > 0) { + largest = left; + } + + if (right < heapSize && compareFn(array[right], array[largest]) > 0) { + largest = right; + } + + if (largest !== index) { + swap(array, index, largest); + heapify(array, largest, heapSize, compareFn); + } +} + +function buildMaxHeap(array: any[], compareFn: ICompareFunction) { + for (let i = Math.floor(array.length / 2); i >= 0; i -= 1) { + heapify(array, i, array.length, compareFn); + } + return array; +} + +export default function heapSort(array: any[], compareFn = defaultCompare) { + let heapSize = array.length; + buildMaxHeap(array, compareFn); + while (heapSize > 1) { + swap(array, 0, --heapSize); + heapify(array, 0, heapSize, compareFn); + } + return array; +} diff --git a/src/ts/algorithms/sorting/insertion-sort.ts b/src/ts/algorithms/sorting/insertion-sort.ts new file mode 100644 index 00000000..e67c4f34 --- /dev/null +++ b/src/ts/algorithms/sorting/insertion-sort.ts @@ -0,0 +1,20 @@ +import { Compare, defaultCompare } from '../../util'; + +export const insertionSort = (array: any[], compareFn = defaultCompare) => { + const { length } = array; + let temp; + for (let i = 1; i < length; i++) { + let j = i; + temp = array[i]; + // console.log('to be inserted ' + temp); + while (j > 0 && compareFn(array[j - 1], temp) === Compare.BIGGER_THAN) { + // console.log('shift ' + array[j - 1]); + array[j] = array[j - 1]; + j--; + } + // console.log('insert ' + temp); + array[j] = temp; + } + + return array; +}; diff --git a/src/ts/algorithms/sorting/merge-sort.ts b/src/ts/algorithms/sorting/merge-sort.ts new file mode 100644 index 00000000..b4f20f65 --- /dev/null +++ b/src/ts/algorithms/sorting/merge-sort.ts @@ -0,0 +1,25 @@ +import { Compare, defaultCompare, ICompareFunction } from '../../util'; + +function merge(left: T[], right: T[], compareFn: ICompareFunction) { + let i = 0; + let j = 0; + const result = []; + + while (i < left.length && j < right.length) { + result.push(compareFn(left[i], right[j]) === Compare.LESS_THAN ? left[i++] : right[j++]); + } + + return result.concat(i < left.length ? left.slice(i) : right.slice(j)); +} + +export function mergeSort(array: T[], compareFn = defaultCompare): T[] { + if (array.length > 1) { + const { length } = array; + const middle = Math.floor(length / 2); + const left = mergeSort(array.slice(0, middle), compareFn); + const right = mergeSort(array.slice(middle, length), compareFn); + array = merge(left, right, compareFn); + } + + return array; +} diff --git a/src/ts/algorithms/sorting/quicksort.ts b/src/ts/algorithms/sorting/quicksort.ts new file mode 100644 index 00000000..f9336b19 --- /dev/null +++ b/src/ts/algorithms/sorting/quicksort.ts @@ -0,0 +1,56 @@ +import { Compare, defaultCompare, ICompareFunction, swap } from '../../util'; + +const partition = function(array: any[], left: number, right: number, compareFn: ICompareFunction) { + const pivot = array[Math.floor((right + left) / 2)]; + let i = left; + let j = right; + + // console.log('pivot is ' + pivot + '; left is ' + left + '; right is ' + right); + + while (i <= j) { + while (compareFn(array[i], pivot) === Compare.LESS_THAN) { + i++; + // console.log('i = ' + i); + } + + while (compareFn(array[j], pivot) === Compare.BIGGER_THAN) { + j--; + // console.log('j = ' + j); + } + + if (i <= j) { + // console.log('swap ' + array[i] + ' with ' + array[j]); + swap(array, i, j); + i++; + j--; + } + } + + return i; +}; + +const quick = function( + array: any[], + left: number, + right: number, + compareFn: ICompareFunction +) { + let index; + + if (array.length > 1) { + index = partition(array, left, right, compareFn); + + if (left < index - 1) { + quick(array, left, index - 1, compareFn); + } + + if (index < right) { + quick(array, index, right, compareFn); + } + } + return array; +}; + +export const quickSort = (array: any[], compareFn = defaultCompare) => { + return quick(array, 0, array.length - 1, compareFn); +}; diff --git a/src/ts/algorithms/sorting/radix-sort.ts b/src/ts/algorithms/sorting/radix-sort.ts new file mode 100644 index 00000000..e6d1027a --- /dev/null +++ b/src/ts/algorithms/sorting/radix-sort.ts @@ -0,0 +1,60 @@ +import { findMaxValue, findMinValue } from '../search/min-max-search'; + +const countingSortForRadix = ( + array: number[], + radixBase: number, + significantDigit: number, + minValue: any +) => { + let bucketsIndex; + const buckets: number[] = []; + const aux: number[] = []; + + for (let i = 0; i < radixBase; i++) { + buckets[i] = 0; + } + + for (let i = 0; i < array.length; i++) { + bucketsIndex = Math.floor(((array[i] - minValue) / significantDigit) % radixBase); + buckets[bucketsIndex]++; + } + + for (let i = 1; i < radixBase; i++) { + buckets[i] += buckets[i - 1]; + } + + for (let i = array.length - 1; i >= 0; i--) { + bucketsIndex = Math.floor(((array[i] - minValue) / significantDigit) % radixBase); + aux[--buckets[bucketsIndex]] = array[i]; + } + + + // array = []; + // array.push(...aux); + for (let i = 0; i < array.length; i++) { + array[i] = aux[i]; + } + + return array; +}; + +export function radixSort(array: number[], radixBase = 10) { + + if (array.length < 2) { + return array; + } + + const minValue = findMinValue(array); + const maxValue = findMaxValue(array); + + // Perform counting sort for each significant digit, starting at 1 + let significantDigit = 1; + while ((maxValue - minValue) / significantDigit >= 1) { + // console.log('radix sort for digit ' + significantDigit); + array = countingSortForRadix(array, radixBase, significantDigit, minValue); + // console.log(array.join()); + significantDigit *= radixBase; + } + + return array; +} diff --git a/src/ts/algorithms/sorting/selection-sort.ts b/src/ts/algorithms/sorting/selection-sort.ts new file mode 100644 index 00000000..465e78a1 --- /dev/null +++ b/src/ts/algorithms/sorting/selection-sort.ts @@ -0,0 +1,23 @@ +import { Compare, defaultCompare, swap } from '../../util'; + +export const selectionSort = (array: any[], compareFn = defaultCompare) => { + const { length } = array; + let indexMin; + + for (let i = 0; i < length - 1; i++) { + indexMin = i; + // console.log('index ' + array[i]); + for (let j = i; j < length; j++) { + if (compareFn(array[indexMin], array[j]) === Compare.BIGGER_THAN) { + // console.log('new index min ' + array[j]); + indexMin = j; + } + } + if (i !== indexMin) { + // console.log('swap ' + array[i] + ' with ' + array[indexMin]); + swap(array, i, indexMin); + } + } + + return array; +}; diff --git a/src/ts/algorithms/sorting/shell-sort.ts b/src/ts/algorithms/sorting/shell-sort.ts new file mode 100644 index 00000000..19e11bf9 --- /dev/null +++ b/src/ts/algorithms/sorting/shell-sort.ts @@ -0,0 +1,25 @@ +import { Compare, defaultCompare } from '../../util'; + +export function shellSort(array: T[], compareFn = defaultCompare) { + let increment = array.length / 2; + while (increment > 0) { + for (let i = increment; i < array.length; i++) { + let j = i; + const temp = array[i]; + + while (j >= increment && compareFn(array[j - increment], temp) === Compare.BIGGER_THAN) { + array[j] = array[j - increment]; + j = j - increment; + } + + array[j] = temp; + } + + if (increment === 2) { + increment = 1; + } else { + increment = Math.floor(increment * 5 / 11); + } + } + return array; +} diff --git a/src/ts/algorithms/string/brute-force.ts b/src/ts/algorithms/string/brute-force.ts new file mode 100644 index 00000000..1bf21f85 --- /dev/null +++ b/src/ts/algorithms/string/brute-force.ts @@ -0,0 +1,22 @@ +const stringSearch = (text: string, pattern: string) => { + const n = text.length; + const m = pattern.length; + + if (m > n) { + return -1; + } + + for (let i = 0; i < n; i++) { + let j = 0; + for (j = 0; j < m && (i + j) < n; j++) { + if (text.charAt(i + j) !== pattern.charAt(j)) { + break; + } + } + if (j === m) { + return i; + } + } + + return -1; +}; diff --git a/src/ts/algorithms/string/huffman.ts b/src/ts/algorithms/string/huffman.ts new file mode 100644 index 00000000..e69de29b diff --git a/src/ts/algorithms/string/knuth-morris-pratt.ts b/src/ts/algorithms/string/knuth-morris-pratt.ts new file mode 100644 index 00000000..4b0f2759 --- /dev/null +++ b/src/ts/algorithms/string/knuth-morris-pratt.ts @@ -0,0 +1,46 @@ +const buildTable = (pattern: string) => { + const length = pattern.length; + const table = []; + let position = 2; + let cnd = 0; + + table[0] = -1; + table[1] = 0; + + while (position < length) { + if (pattern[position - 1] === pattern[cnd]) { + table[position++] = ++cnd; + } else if (cnd > 0) { + cnd = table[cnd]; + } else { + table[position++] = 0; + } + } + + return table; +}; + +const knuthMorrisPratt = (text: string, pattern: string) => { + const textLength = text.length; + const patternLength = pattern.length; + let m = 0; + let i = 0; + const table = buildTable(pattern); + + while (m + i < textLength) { + if (pattern[i] === text[m + i]) { + if (i === patternLength - 1) { + return m; + } + i++; + } else if (table[i] >= 0) { + i = table[i]; + m = m + i - table[i]; + } else { + i = 0; + m++; + } + } + + return textLength; +}; diff --git a/src/ts/algorithms/string/longest-common-substring.ts b/src/ts/algorithms/string/longest-common-substring.ts new file mode 100644 index 00000000..e69de29b diff --git a/src/ts/algorithms/string/rabin-karp.ts b/src/ts/algorithms/string/rabin-karp.ts new file mode 100644 index 00000000..ab60fe3e --- /dev/null +++ b/src/ts/algorithms/string/rabin-karp.ts @@ -0,0 +1,39 @@ +const base = 997; + +const hash = (word: string) => { + let h = 0; + + for (let i = 0; i < word.length; i++) { + h += word.charCodeAt(i) * Math.pow(base, word.length - i - 1); + } + + return h; +}; + +const rabinKarp = (text: string, pattern: string) => { + if (pattern == null || pattern.length === 0) { + return 0; + } + + const hashPattern = hash(pattern); + let currentSubstring = text.substring(0, pattern.length); + let hashCurrentSubstring; + + for (let i = pattern.length; i <= text.length; i++) { + if (hashCurrentSubstring === undefined) { + hashCurrentSubstring = hash(currentSubstring); + } else { + hashCurrentSubstring -= currentSubstring.charCodeAt(0) * Math.pow(base, pattern.length - 1); + hashCurrentSubstring *= base; + hashCurrentSubstring += text.charCodeAt(i); + + currentSubstring = currentSubstring.substring(1) + text[i]; + } + + if (hashPattern === hashCurrentSubstring && pattern === currentSubstring) { + return i === pattern.length ? 0 : i - pattern.length + 1; + } + } + + return -1; +}; diff --git a/src/ts/data-structures/avl-tree.ts b/src/ts/data-structures/avl-tree.ts new file mode 100644 index 00000000..266e204a --- /dev/null +++ b/src/ts/data-structures/avl-tree.ts @@ -0,0 +1,161 @@ +import { Compare, defaultCompare, ICompareFunction } from '../util'; +import BinarySearchTree from './binary-search-tree'; +import { Node } from './models/node'; + +enum BalanceFactor { + UNBALANCED_RIGHT = 1, + SLIGHTLY_UNBALANCED_RIGHT = 2, + BALANCED = 3, + SLIGHTLY_UNBALANCED_LEFT = 4, + UNBALANCED_LEFT = 5 +} + +export default class AVLTree extends BinarySearchTree { + + constructor(protected compareFn: ICompareFunction = defaultCompare) { + super(compareFn); + } + + private getNodeHeight(node: Node): number { + if (node == null) { + return -1; + } + return Math.max(this.getNodeHeight(node.left), this.getNodeHeight(node.right)) + 1; + } + + /** + * Left left case: rotate right + * + * b a + * / \ / \ + * a e -> rotationLL(b) -> c b + * / \ / \ + * c d d e + * + * @param node Node + */ + private rotationLL(node: Node) { + const tmp = node.left; + node.left = tmp.right; + tmp.right = node; + return tmp; + } + + /** + * Right right case: rotate left + * + * a b + * / \ / \ + * c b -> rotationRR(a) -> a e + * / \ / \ + * d e c d + * + * @param node Node + */ + private rotationRR(node: Node) { + const tmp = node.right; + node.right = tmp.left; + tmp.left = node; + return tmp; + } + + /** + * Left right case: rotate left then right + * @param node Node + */ + private rotationLR(node: Node) { + node.left = this.rotationRR(node.left); + return this.rotationLL(node); + } + + /** + * Right left case: rotate right then left + * @param node Node + */ + private rotationRL(node: Node) { + node.right = this.rotationLL(node.right); + return this.rotationRR(node); + } + + private getBalanceFactor(node: Node) { + const heightDifference = this.getNodeHeight(node.left) - this.getNodeHeight(node.right); + switch (heightDifference) { + case -2: + return BalanceFactor.UNBALANCED_RIGHT; + case -1: + return BalanceFactor.SLIGHTLY_UNBALANCED_RIGHT; + case 1: + return BalanceFactor.SLIGHTLY_UNBALANCED_LEFT; + case 2: + return BalanceFactor.UNBALANCED_LEFT; + default: + return BalanceFactor.BALANCED; + } + } + + insert(key: T) { + this.root = this.insertNode(this.root, key); + } + + protected insertNode(node: Node, key: T) { + if (node == null) { + return new Node(key); + } + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + node.left = this.insertNode(node.left, key); + } else { + node.right = this.insertNode(node.right, key); + } + + // verify if tree is balanced + const balanceFactor = this.getBalanceFactor(node); + if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) { + if (this.compareFn(key, node.left.key) === Compare.LESS_THAN) { + // Left left case + node = this.rotationLL(node); + } else { + // Left right case + node = this.rotationLR(node); + } + } + if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) { + if (this.compareFn(key, node.right.key) === Compare.BIGGER_THAN) { + // Right right case + node = this.rotationRR(node); + } else { + // Right left case + node = this.rotationRL(node); + } + } + return node; + } + + protected removeNode(node: Node, key: T) { + node = super.removeNode(node, key); // {1} + if (node == null) { + return node; + } + + // verify if tree is balanced + const balanceFactor = this.getBalanceFactor(node); + if (balanceFactor === BalanceFactor.UNBALANCED_LEFT) { + if (this.compareFn(key, node.left.key) === Compare.LESS_THAN) { + // Left left case + node = this.rotationLL(node); + } else { + // Left right case + node = this.rotationLR(node); + } + } + if (balanceFactor === BalanceFactor.UNBALANCED_RIGHT) { + if (this.compareFn(key, node.right.key) === Compare.BIGGER_THAN) { + // Right right case + node = this.rotationRR(node); + } else { + // Right left case + node = this.rotationRL(node); + } + } + return node; + } +} diff --git a/src/ts/data-structures/binary-search-tree.ts b/src/ts/data-structures/binary-search-tree.ts new file mode 100644 index 00000000..dd7141ff --- /dev/null +++ b/src/ts/data-structures/binary-search-tree.ts @@ -0,0 +1,159 @@ +import { Compare, defaultCompare, ICompareFunction } from '../util'; +import { Node } from './models/node'; + +export default class BinarySearchTree { + protected root: Node; + + constructor(protected compareFn: ICompareFunction = defaultCompare) {} + + insert(key: T) { + // special case: first key + if (this.root == null) { + this.root = new Node(key); + } else { + this.insertNode(this.root, key); + } + } + + protected insertNode(node: Node, key: T) { + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + if (node.left == null) { + node.left = new Node(key); + } else { + this.insertNode(node.left, key); + } + } else if (node.right == null) { + node.right = new Node(key); + } else { + this.insertNode(node.right, key); + } + } + + getRoot() { + return this.root; + } + + search(key: T) { + return this.searchNode(this.root, key); + } + + private searchNode(node: Node, key: T): boolean { + if (node == null) { + return false; + } + + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + return this.searchNode(node.left, key); + } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) { + return this.searchNode(node.right, key); + } + // key is equal to node.item + return true; + } + + inOrderTraverse(callback: Function) { + this.inOrderTraverseNode(this.root, callback); + } + + private inOrderTraverseNode(node: Node, callback: Function) { + if (node != null) { + this.inOrderTraverseNode(node.left, callback); + callback(node.key); + this.inOrderTraverseNode(node.right, callback); + } + } + + preOrderTraverse(callback: Function) { + this.preOrderTraverseNode(this.root, callback); + } + + private preOrderTraverseNode(node: Node, callback: Function) { + if (node != null) { + callback(node.key); + this.preOrderTraverseNode(node.left, callback); + this.preOrderTraverseNode(node.right, callback); + } + } + + postOrderTraverse(callback: Function) { + this.postOrderTraverseNode(this.root, callback); + } + + private postOrderTraverseNode(node: Node, callback: Function) { + if (node != null) { + this.postOrderTraverseNode(node.left, callback); + this.postOrderTraverseNode(node.right, callback); + callback(node.key); + } + } + + min() { + return this.minNode(this.root); + } + + protected minNode(node: Node) { + let current = node; + while (current != null && current.left != null) { + current = current.left; + } + return current; + } + + max() { + return this.maxNode(this.root); + } + + protected maxNode(node: Node) { + let current = node; + while (current != null && current.right != null) { + current = current.right; + } + return current; + } + + remove(key: T) { + this.root = this.removeNode(this.root, key); + } + + protected removeNode(node: Node, key: T) { + if (node == null) { + return null; + } + + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + node.left = this.removeNode(node.left, key); + return node; + } else if (this.compareFn(key, node.key) === Compare.BIGGER_THAN) { + node.right = this.removeNode(node.right, key); + return node; + } else { + // key is equal to node.item + + // handle 3 special conditions + // 1 - a leaf node + // 2 - a node with only 1 child + // 3 - a node with 2 children + + // case 1 + if (node.left == null && node.right == null) { + node = null; + return node; + } + + // case 2 + if (node.left == null) { + node = node.right; + return node; + } else if (node.right == null) { + node = node.left; + return node; + } + + // case 3 + const aux = this.minNode(node.right); + node.key = aux.key; + node.right = this.removeNode(node.right, aux.key); + return node; + } + } +} diff --git a/src/ts/data-structures/circular-linked-list.ts b/src/ts/data-structures/circular-linked-list.ts new file mode 100644 index 00000000..802f6138 --- /dev/null +++ b/src/ts/data-structures/circular-linked-list.ts @@ -0,0 +1,80 @@ +import { defaultEquals, IEqualsFunction } from '../util'; +import LinkedList from './linked-list'; +import { Node } from './models/linked-list-models'; + +export default class CircularLinkedList extends LinkedList { + constructor(protected equalsFn: IEqualsFunction = defaultEquals) { + super(equalsFn); + } + + push(element: T) { + const node = new Node(element); + let current; + + if (this.head == null) { + this.head = node; + } else { + current = this.getElementAt(this.size() - 1); + current.next = node; + } + + // set node.next to head - to have circular list + node.next = this.head; + + this.count++; + } + + insert(element: T, index: number) { + if (index >= 0 && index <= this.count) { + const node = new Node(element); + let current = this.head; + + if (index === 0) { + if (this.head == null) { + // if no node in list + this.head = node; + node.next = this.head; + } else { + node.next = current; + current = this.getElementAt(this.size() - 1); + // update last element + this.head = node; + current.next = this.head; + } + } else { + const previous = this.getElementAt(index - 1); + node.next = previous.next; + previous.next = node; + } + this.count++; + return true; + } + return false; + } + + removeAt(index: number) { + if (index >= 0 && index < this.count) { + let current = this.head; + + if (index === 0) { + if (this.size() === 1) { + this.head = undefined; + } else { + const removed = this.head; + current = this.getElementAt(this.size() - 1); + this.head = this.head.next; + current.next = this.head; + current = removed; + } + } else { + // no need to update last element for circular list + const previous = this.getElementAt(index - 1); + current = previous.next; + previous.next = current.next; + } + this.count--; + return current.element; + } + return undefined; + } +} diff --git a/src/ts/data-structures/deque.ts b/src/ts/data-structures/deque.ts new file mode 100644 index 00000000..155b735c --- /dev/null +++ b/src/ts/data-structures/deque.ts @@ -0,0 +1,90 @@ +export default class Deque { + private count: number; + private lowestCount: number; + private items: any; + + constructor() { + this.count = 0; + this.lowestCount = 0; + this.items = {}; + } + + addFront(element: T) { + if (this.isEmpty()) { + this.addBack(element); + } else if (this.lowestCount > 0) { + this.lowestCount--; + this.items[this.lowestCount] = element; + } else { + for (let i = this.count; i > 0; i--) { + this.items[i] = this.items[i - 1]; + } + this.count++; + this.items[0] = element; + } + } + + addBack(element: T) { + this.items[this.count] = element; + this.count++; + } + + removeFront() { + if (this.isEmpty()) { + return undefined; + } + const result = this.items[this.lowestCount]; + delete this.items[this.lowestCount]; + this.lowestCount++; + return result; + } + + removeBack() { + if (this.isEmpty()) { + return undefined; + } + this.count--; + const result = this.items[this.count]; + delete this.items[this.count]; + return result; + } + + peekFront() { + if (this.isEmpty()) { + return undefined; + } + return this.items[this.lowestCount]; + } + + peekBack() { + if (this.isEmpty()) { + return undefined; + } + return this.items[this.count - 1]; + } + + isEmpty() { + return this.size() === 0; + } + + clear() { + this.items = {}; + this.count = 0; + this.lowestCount = 0; + } + + size() { + return this.count - this.lowestCount; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + let objString = `${this.items[this.lowestCount]}`; + for (let i = this.lowestCount + 1; i < this.count; i++) { + objString = `${objString},${this.items[i]}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/dictionary.ts b/src/ts/data-structures/dictionary.ts new file mode 100644 index 00000000..98485718 --- /dev/null +++ b/src/ts/data-structures/dictionary.ts @@ -0,0 +1,86 @@ +import { defaultToString } from '../util'; +import { ValuePair } from './models/value-pair'; + +export default class Dictionary { + private table: { [key: string]: ValuePair }; + + constructor(private toStrFn: (key: K) => string = defaultToString) { + this.table = {}; + } + + set(key: K, value: V) { + if (key != null && value != null) { + const tableKey = this.toStrFn(key); + this.table[tableKey] = new ValuePair(key, value); + return true; + } + return false; + } + + get(key: K): V { + const valuePair = this.table[this.toStrFn(key)]; + return valuePair == null ? undefined : valuePair.value; + } + + hasKey(key: K) { + return this.table[this.toStrFn(key)] != null; + } + + remove(key: K) { + if (this.hasKey(key)) { + delete this.table[this.toStrFn(key)]; + return true; + } + return false; + } + + values(): V[] { + return this.keyValues().map( + (valuePair: ValuePair) => valuePair.value + ); + } + + keys(): K[] { + return this.keyValues().map( + (valuePair: ValuePair) => valuePair.key + ); + } + + keyValues(): ValuePair[] { + return Object.values(this.table); + } + + forEach(callbackFn: (key: K, value: V) => any) { + const valuePairs = this.keyValues(); + for (let i = 0; i < valuePairs.length; i++) { + const result = callbackFn(valuePairs[i].key, valuePairs[i].value); + if (result === false) { + break; + } + } + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.table).length; + } + + clear() { + this.table = {}; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const valuePairs = this.keyValues(); + let objString = `${valuePairs[0].toString()}`; + for (let i = 1; i < valuePairs.length; i++) { + objString = `${objString},${valuePairs[i].toString()}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/doubly-linked-list.ts b/src/ts/data-structures/doubly-linked-list.ts new file mode 100644 index 00000000..a2d16e72 --- /dev/null +++ b/src/ts/data-structures/doubly-linked-list.ts @@ -0,0 +1,148 @@ +import { defaultEquals, IEqualsFunction } from '../util'; +import LinkedList from './linked-list'; +import { DoublyNode } from './models/linked-list-models'; + +export default class DoublyLinkedList extends LinkedList { + protected head: DoublyNode | undefined; + protected tail: DoublyNode | undefined; + + constructor(protected equalsFn: IEqualsFunction = defaultEquals) { + super(equalsFn); + } + + push(element: T) { + const node = new DoublyNode(element); + + if (this.head == null) { + this.head = node; + this.tail = node; // NEW + } else { + // attach to the tail node // NEW + this.tail.next = node; + node.prev = this.tail; + this.tail = node; + } + this.count++; + } + + insert(element: T, index: number) { + if (index >= 0 && index <= this.count) { + const node = new DoublyNode(element); + let current = this.head; + + if (index === 0) { + if (this.head == null) { + // NEW + this.head = node; + this.tail = node; + } else { + node.next = this.head; + this.head.prev = node; // NEW + this.head = node; + } + } else if (index === this.count) { + // last item // NEW + current = this.tail; // {2} + current.next = node; + node.prev = current; + this.tail = node; + } else { + const previous = this.getElementAt(index - 1); + current = previous.next; + node.next = current; + previous.next = node; + + current.prev = node; // NEW + node.prev = previous; // NEW + } + this.count++; + return true; + } + return false; + } + + removeAt(index: number) { + if (index >= 0 && index < this.count) { + let current = this.head; + + if (index === 0) { + this.head = this.head.next; // {1} + // if there is only one item, then we update tail as well //NEW + if (this.count === 1) { + // {2} + this.tail = undefined; + } else { + this.head.prev = undefined; // {3} + } + } else if (index === this.count - 1) { + // last item //NEW + current = this.tail; // {4} + this.tail = current.prev; + this.tail.next = undefined; + } else { + current = this.getElementAt(index); + const previous = current.prev; + // link previous with current's next - skip it to remove + previous.next = current.next; // {6} + current.next.prev = previous; // NEW + } + this.count--; + return current.element; + } + return undefined; + } + + indexOf(element: T) { + let current = this.head; + let index = 0; + + while (current != null) { + if (this.equalsFn(element, current.element)) { + return index; + } + index++; + current = current.next; + } + + return -1; + } + + getHead() { + return this.head; + } + + getTail() { + return this.tail; + } + + clear() { + super.clear(); + this.tail = undefined; + } + + toString() { + if (this.head == null) { + return ''; + } + let objString = `${this.head.element}`; + let current = this.head.next; + while (current != null) { + objString = `${objString},${current.element}`; + current = current.next; + } + return objString; + } + + inverseToString() { + if (this.tail == null) { + return ''; + } + let objString = `${this.tail.element}`; + let previous = this.tail.prev; + while (previous != null) { + objString = `${objString},${previous.element}`; + previous = previous.prev; + } + return objString; + } +} diff --git a/src/ts/data-structures/graph.ts b/src/ts/data-structures/graph.ts new file mode 100644 index 00000000..b07a4eb4 --- /dev/null +++ b/src/ts/data-structures/graph.ts @@ -0,0 +1,49 @@ +import Dictionary from './dictionary'; + +export default class Graph { + private vertices: (string | number)[] = []; + private adjList: Dictionary = new Dictionary(); + + constructor(private isDirected = false) {} + + addVertex(v: string | number) { + if (!this.vertices.includes(v)) { + this.vertices.push(v); + this.adjList.set(v, []); // initialize adjacency list with array as well; + } + } + + addEdge(a: string | number, b: string | number) { + if (!this.adjList.get(a)) { + this.addVertex(a); + } + if (!this.adjList.get(b)) { + this.addVertex(b); + } + this.adjList.get(a).push(b); + if (this.isDirected !== true) { + this.adjList.get(b).push(a); + } + } + + getVertices() { + return this.vertices; + } + + getAdjList() { + return this.adjList; + } + + toString() { + let s = ''; + for (let i = 0; i < this.vertices.length; i++) { + s += this.vertices[i] + ' -> '; + const neighbors = this.adjList.get(this.vertices[i]); + for (let j = 0; j < neighbors.length; j++) { + s += neighbors[j] + ' '; + } + s += '\n'; + } + return s; + } +} diff --git a/src/ts/data-structures/hash-table-linear-probing-lazy.ts b/src/ts/data-structures/hash-table-linear-probing-lazy.ts new file mode 100644 index 00000000..43817050 --- /dev/null +++ b/src/ts/data-structures/hash-table-linear-probing-lazy.ts @@ -0,0 +1,136 @@ +import { defaultToString } from '../util'; +import { ValuePairLazy } from './models/value-pair-lazy'; + +export default class HashTableLinearProbingLazy { + protected table: { [key: string]: ValuePairLazy }; + + constructor(protected toStrFn: (key: K) => string = defaultToString) { + this.table = {}; + } + + private loseloseHashCode(key: K) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + hashCode(key: K) { + return this.loseloseHashCode(key); + } + + put(key: K, value: V) { + if (key != null && value != null) { + const position = this.hashCode(key); + + if ( + this.table[position] == null || + (this.table[position] != null && this.table[position].isDeleted) + ) { + this.table[position] = new ValuePairLazy(key, value); + } else { + let index = position + 1; + while (this.table[index] != null && !this.table[position].isDeleted) { + index++; + } + this.table[index] = new ValuePairLazy(key, value); + } + return true; + } + return false; + } + + get(key: K) { + const position = this.hashCode(key); + + if (this.table[position] != null) { + if (this.table[position].key === key && !this.table[position].isDeleted) { + return this.table[position].value; + } + let index = position + 1; + while ( + this.table[index] != null && + (this.table[index].key !== key || this.table[index].isDeleted) + ) { + if (this.table[index].key === key && this.table[index].isDeleted) { + return undefined; + } + index++; + } + if ( + this.table[index] != null && + this.table[index].key === key && + !this.table[index].isDeleted + ) { + return this.table[position].value; + } + } + return undefined; + } + + remove(key: K) { + const position = this.hashCode(key); + + if (this.table[position] != null) { + if (this.table[position].key === key && !this.table[position].isDeleted) { + this.table[position].isDeleted = true; + return true; + } + let index = position + 1; + while ( + this.table[index] != null && + (this.table[index].key !== key || this.table[index].isDeleted) + ) { + index++; + } + if ( + this.table[index] != null && + this.table[index].key === key && + !this.table[index].isDeleted + ) { + this.table[index].isDeleted = true; + return true; + } + } + return false; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + let count = 0; + Object.values(this.table).forEach(valuePair => { + count += valuePair.isDeleted === true ? 0 : 1; + }); + return count; + } + + clear() { + this.table = {}; + } + + getTable() { + return this.table; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[ + keys[i] + ].toString()}}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/hash-table-linear-probing.ts b/src/ts/data-structures/hash-table-linear-probing.ts new file mode 100644 index 00000000..fb82d20a --- /dev/null +++ b/src/ts/data-structures/hash-table-linear-probing.ts @@ -0,0 +1,128 @@ +import { defaultToString } from '../util'; +import { ValuePair } from './models/value-pair'; + +export default class HashTableLinearProbing { + protected table: { [key: string]: ValuePair }; + + constructor(protected toStrFn: (key: K) => string = defaultToString) { + this.table = {}; + } + + private loseloseHashCode(key: K) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + hashCode(key: K) { + return this.loseloseHashCode(key); + } + + put(key: K, value: V) { + if (key != null && value != null) { + const position = this.hashCode(key); + + if (this.table[position] == null) { + this.table[position] = new ValuePair(key, value); + } else { + let index = position + 1; + while (this.table[index] != null) { + index++; + } + this.table[index] = new ValuePair(key, value); + } + return true; + } + return false; + } + + get(key: K) { + const position = this.hashCode(key); + + if (this.table[position] != null) { + if (this.table[position].key === key) { + return this.table[position].value; + } + let index = position + 1; + while (this.table[index] != null && this.table[index].key !== key) { + index++; + } + if (this.table[index] != null && this.table[index].key === key) { + return this.table[index].value; + } + } + return undefined; + } + + remove(key: K) { + const position = this.hashCode(key); + + if (this.table[position] != null) { + if (this.table[position].key === key) { + delete this.table[position]; + this.verifyRemoveSideEffect(key, position); + return true; + } + let index = position + 1; + while (this.table[index] != null && this.table[index].key !== key) { + index++; + } + if (this.table[index] != null && this.table[index].key === key) { + delete this.table[index]; + this.verifyRemoveSideEffect(key, index); + return true; + } + } + return false; + } + + private verifyRemoveSideEffect(key: K, removedPosition: number) { + const hash = this.hashCode(key); + let index = removedPosition + 1; + while (this.table[index] != null) { + const posHash = this.hashCode(this.table[index].key); + if (posHash <= hash || posHash <= removedPosition) { + this.table[removedPosition] = this.table[index]; + delete this.table[index]; + removedPosition = index; + } + index++; + } + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.table).length; + } + + clear() { + this.table = {}; + } + + getTable() { + return this.table; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[ + keys[i] + ].toString()}}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/hash-table-separate-chaining.ts b/src/ts/data-structures/hash-table-separate-chaining.ts new file mode 100644 index 00000000..165ff15d --- /dev/null +++ b/src/ts/data-structures/hash-table-separate-chaining.ts @@ -0,0 +1,106 @@ +import { defaultToString } from '../util'; +import LinkedList from './linked-list'; +import { ValuePair } from './models/value-pair'; + +export default class HashTableSeparateChaining { + protected table: { [key: string]: LinkedList> }; + + constructor(protected toStrFn: (key: K) => string = defaultToString) { + this.table = {}; + } + + private loseloseHashCode(key: K) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + hashCode(key: K) { + return this.loseloseHashCode(key); + } + + put(key: K, value: V) { + if (key != null && value != null) { + const position = this.hashCode(key); + + if (this.table[position] == null) { + this.table[position] = new LinkedList>(); + } + this.table[position].push(new ValuePair(key, value)); + return true; + } + return false; + } + + get(key: K) { + const position = this.hashCode(key); + const linkedList = this.table[position]; + if (linkedList != null && !linkedList.isEmpty()) { + let current = linkedList.getHead(); + while (current != null) { + if (current.element.key === key) { + return current.element.value; + } + current = current.next; + } + } + return undefined; + } + + remove(key: K) { + const position = this.hashCode(key); + const linkedList = this.table[position]; + if (linkedList != null && !linkedList.isEmpty()) { + let current = linkedList.getHead(); + while (current != null) { + if (current.element.key === key) { + linkedList.remove(current.element); + if (linkedList.isEmpty()) { + delete this.table[position]; + } + return true; + } + current = current.next; + } + } + return false; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + let count = 0; + Object.values(this.table).forEach(linkedList => count += linkedList.size()); + return count; + } + + clear() { + this.table = {}; + } + + getTable() { + return this.table; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[ + keys[i] + ].toString()}}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/hash-table.ts b/src/ts/data-structures/hash-table.ts new file mode 100644 index 00000000..7b3c6983 --- /dev/null +++ b/src/ts/data-structures/hash-table.ts @@ -0,0 +1,87 @@ +import { defaultToString } from '../util'; +import { ValuePair } from './models/value-pair'; + +export default class HashTable { + protected table: { [key: string]: ValuePair }; + + constructor(protected toStrFn: (key: K) => string = defaultToString) { + this.table = {}; + } + + private loseloseHashCode(key: K) { + if (typeof key === 'number') { + return key; + } + const tableKey = this.toStrFn(key); + let hash = 0; + for (let i = 0; i < tableKey.length; i++) { + hash += tableKey.charCodeAt(i); + } + return hash % 37; + } + + /* private djb2HashCode(key: K) { + const tableKey = this.toStrFn(key); + let hash = 5381; + for (let i = 0; i < tableKey.length; i++) { + hash = (hash * 33) + tableKey.charCodeAt(i); + } + return hash % 1013; + } */ + + hashCode(key: K) { + return this.loseloseHashCode(key); + } + + put(key: K, value: V) { + if (key != null && value != null) { + const position = this.hashCode(key); + this.table[position] = new ValuePair(key, value); + return true; + } + return false; + } + + get(key: K) { + const valuePair = this.table[this.hashCode(key)]; + return valuePair == null ? undefined : valuePair.value; + } + + remove(key: K) { + const hash = this.hashCode(key); + const valuePair = this.table[hash]; + if (valuePair != null) { + delete this.table[hash]; + return true; + } + return false; + } + + getTable() { + return this.table; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.table).length; + } + + clear() { + this.table = {}; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const keys = Object.keys(this.table); + let objString = `{${keys[0]} => ${this.table[keys[0]].toString()}}`; + for (let i = 1; i < keys.length; i++) { + objString = `${objString},{${keys[i]} => ${this.table[keys[i]].toString()}}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/heap.ts b/src/ts/data-structures/heap.ts new file mode 100644 index 00000000..5f27b089 --- /dev/null +++ b/src/ts/data-structures/heap.ts @@ -0,0 +1,121 @@ +import { Compare, defaultCompare, ICompareFunction, reverseCompare, swap } from '../util'; + +export class MinHeap { + protected heap: T[] = []; + + constructor(protected compareFn: ICompareFunction = defaultCompare) {} + + private getLeftIndex(index: number) { + return 2 * index + 1; + } + + private getRightIndex(index: number) { + return 2 * index + 2; + } + + private getParentIndex(index: number) { + if (index === 0) { + return undefined; + } + return Math.floor((index - 1) / 2); + } + + size() { + return this.heap.length; + } + + isEmpty() { + return this.size() <= 0; + } + + clear() { + this.heap = []; + } + + findMinimum() { + return this.isEmpty() ? undefined : this.heap[0]; + } + + insert(value: T) { + if (value != null) { + const index = this.heap.length; + this.heap.push(value); + this.siftUp(index); + return true; + } + return false; + } + + private siftDown(index: number) { + let element = index; + const left = this.getLeftIndex(index); + const right = this.getRightIndex(index); + const size = this.size(); + + if (left < size && this.compareFn(this.heap[element], this.heap[left]) === Compare.BIGGER_THAN) { + element = left; + } + + if ( + right < size && + this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN + ) { + element = right; + } + + if (index !== element) { + swap(this.heap, index, element); + this.siftDown(element); + } + } + + private siftUp(index: number): void { + let parent = this.getParentIndex(index); + while ( + index > 0 && + this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN + ) { + swap(this.heap, parent, index); + index = parent; + parent = this.getParentIndex(index); + } + } + + extract() { + if (this.isEmpty()) { + return undefined; + } + if (this.size() === 1) { + return this.heap.shift(); + } + const removedValue = this.heap[0]; + this.heap[0] = this.heap.pop(); + this.siftDown(0); + return removedValue; + } + + heapify(array: T[]) { + if (array) { + this.heap = array; + } + + const maxIndex = Math.floor(this.size() / 2) - 1; + + for (let i = 0; i <= maxIndex; i++) { + this.siftDown(i); + } + + return this.heap; + } + + getAsArray() { + return this.heap; + } +} + +export class MaxHeap extends MinHeap { + constructor(protected compareFn: ICompareFunction = defaultCompare) { + super(compareFn); + this.compareFn = reverseCompare(compareFn); + } +} diff --git a/src/ts/data-structures/linked-list.ts b/src/ts/data-structures/linked-list.ts new file mode 100644 index 00000000..f0460c90 --- /dev/null +++ b/src/ts/data-structures/linked-list.ts @@ -0,0 +1,123 @@ +import { defaultEquals, IEqualsFunction } from '../util'; +import { Node } from './models/linked-list-models'; + +export default class LinkedList { + protected count = 0; + protected head: Node | undefined; + + constructor(protected equalsFn: IEqualsFunction = defaultEquals) {} + + push(element: T) { + const node = new Node(element); + let current; + + if (this.head == null) { + // catches null && undefined + this.head = node; + } else { + current = this.head; + + while (current.next != null) { + current = current.next; + } + + current.next = node; + } + this.count++; + } + + getElementAt(index: number) { + if (index >= 0 && index <= this.count) { + let node = this.head; + for (let i = 0; i < index && node != null; i++) { + node = node.next; + } + return node; + } + return undefined; + } + + insert(element: T, index: number) { + if (index >= 0 && index <= this.count) { + const node = new Node(element); + + if (index === 0) { + const current = this.head; + node.next = current; + this.head = node; + } else { + const previous = this.getElementAt(index - 1); + node.next = previous.next; + previous.next = node; + } + this.count++; + return true; + } + return false; + } + + removeAt(index: number) { + if (index >= 0 && index < this.count) { + let current = this.head; + + if (index === 0) { + this.head = current.next; + } else { + const previous = this.getElementAt(index - 1); + current = previous.next; + previous.next = current.next; + } + this.count--; + return current.element; + } + return undefined; + } + + remove(element: T) { + const index = this.indexOf(element); + return this.removeAt(index); + } + + indexOf(element: T) { + let current = this.head; + + for (let i = 0; i < this.size() && current != null; i++) { + if (this.equalsFn(element, current.element)) { + return i; + } + current = current.next; + } + + return -1; + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return this.count; + } + + getHead() { + return this.head; + } + + clear() { + this.head = undefined; + this.count = 0; + } + + toString() { + if (this.head == null) { + return ''; + } + let objString = `${this.head.element}`; + let current = this.head.next; + for (let i = 1; i < this.size() && current != null; i++) { + objString = `${objString},${current.element}`; + current = current.next; + } + return objString; + } +} diff --git a/src/ts/data-structures/models/linked-list-models.ts b/src/ts/data-structures/models/linked-list-models.ts new file mode 100644 index 00000000..168d640e --- /dev/null +++ b/src/ts/data-structures/models/linked-list-models.ts @@ -0,0 +1,13 @@ +export class Node { + constructor(public element: T, public next?: Node) {} +} + +export class DoublyNode extends Node { + constructor( + public element: T, + public next?: DoublyNode, + public prev?: DoublyNode + ) { + super(element, next); + } +} diff --git a/src/ts/data-structures/models/node.ts b/src/ts/data-structures/models/node.ts new file mode 100644 index 00000000..f3e3f9aa --- /dev/null +++ b/src/ts/data-structures/models/node.ts @@ -0,0 +1,10 @@ +export class Node { + left: Node; + right: Node; + + constructor(public key: K) {} + + toString() { + return `${this.key}`; + } +} diff --git a/src/ts/data-structures/models/red-black-node.ts b/src/ts/data-structures/models/red-black-node.ts new file mode 100644 index 00000000..76493d9e --- /dev/null +++ b/src/ts/data-structures/models/red-black-node.ts @@ -0,0 +1,22 @@ +import { Node } from './node'; + +export enum Colors { + RED = 0, + BLACK = 1 +} + +export class RedBlackNode extends Node { + left: RedBlackNode; + right: RedBlackNode; + parent: RedBlackNode; + color: Colors; + + constructor(public key: K) { + super(key); + this.color = Colors.RED; + } + + isRed() { + return this.color === Colors.RED; + } +} diff --git a/src/ts/data-structures/models/value-pair-lazy.ts b/src/ts/data-structures/models/value-pair-lazy.ts new file mode 100644 index 00000000..57b6abbd --- /dev/null +++ b/src/ts/data-structures/models/value-pair-lazy.ts @@ -0,0 +1,7 @@ +import { ValuePair } from './value-pair'; + +export class ValuePairLazy extends ValuePair { + constructor(public key: K, public value: V, public isDeleted = false) { + super(key, value); + } +} diff --git a/src/ts/data-structures/models/value-pair.ts b/src/ts/data-structures/models/value-pair.ts new file mode 100644 index 00000000..eb4cff0a --- /dev/null +++ b/src/ts/data-structures/models/value-pair.ts @@ -0,0 +1,7 @@ +export class ValuePair { + constructor(public key: K, public value: V) {} + + toString() { + return `[#${this.key}: ${this.value}]`; + } +} diff --git a/src/ts/data-structures/priority-queue-array.ts b/src/ts/data-structures/priority-queue-array.ts new file mode 100644 index 00000000..6ad0d441 --- /dev/null +++ b/src/ts/data-structures/priority-queue-array.ts @@ -0,0 +1,58 @@ +import { Compare, defaultCompare, ICompareFunction } from '../util'; + +export default class PriorityQueue { + private items: T[]; + + constructor( + private compareFn: ICompareFunction = defaultCompare, + private compare: Compare = Compare.LESS_THAN + ) { + this.items = []; + } + + enqueue(element: T) { + let added = false; + + for (let i = 0; i < this.items.length; i++) { + if (this.compareFn(element, this.items[i]) === this.compare) { + this.items.splice(i, 0, element); + added = true; + break; + } + } + + if (!added) { + this.items.push(element); + } + } + + dequeue() { + return this.items.shift(); + } + + peek() { + if (this.isEmpty()) { + return undefined; + } + return this.items[0]; + } + + isEmpty() { + return this.items.length === 0; + } + + clear() { + this.items = []; + } + + size() { + return this.items.length; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + return this.items; + } +} diff --git a/src/ts/data-structures/queue.ts b/src/ts/data-structures/queue.ts new file mode 100644 index 00000000..b6db45a5 --- /dev/null +++ b/src/ts/data-structures/queue.ts @@ -0,0 +1,58 @@ +export default class Queue { + private count: number; + private lowestCount: number; + private items: any; + + constructor() { + this.count = 0; + this.lowestCount = 0; + this.items = {}; + } + + enqueue(element: T) { + this.items[this.count] = element; + this.count++; + } + + dequeue() { + if (this.isEmpty()) { + return undefined; + } + const result = this.items[this.lowestCount]; + delete this.items[this.lowestCount]; + this.lowestCount++; + return result; + } + + peek() { + if (this.isEmpty()) { + return undefined; + } + return this.items[this.lowestCount]; + } + + isEmpty() { + return this.size() === 0; + } + + clear() { + this.items = {}; + this.count = 0; + this.lowestCount = 0; + } + + size() { + return this.count - this.lowestCount; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + let objString = `${this.items[this.lowestCount]}`; + for (let i = this.lowestCount + 1; i < this.count; i++) { + objString = `${objString},${this.items[i]}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/red-black-tree.ts b/src/ts/data-structures/red-black-tree.ts new file mode 100644 index 00000000..0d206e2f --- /dev/null +++ b/src/ts/data-structures/red-black-tree.ts @@ -0,0 +1,180 @@ +import { defaultCompare, ICompareFunction, Compare } from '../util'; +import BinarySearchTree from './binary-search-tree'; +import { RedBlackNode, Colors } from './models/red-black-node'; + +export default class RedBlackTree extends BinarySearchTree { + protected root: RedBlackNode; + + constructor(protected compareFn: ICompareFunction = defaultCompare) { + super(compareFn); + } + + /** + * Left left case: rotate right + * + * b a + * / \ / \ + * a e -> rotationLL(b) -> c b + * / \ / \ + * c d d e + * + * @param node Node + */ + private rotationLL(node: RedBlackNode) { + const tmp = node.left; + node.left = tmp.right; + if (tmp.right && tmp.right.key) { + tmp.right.parent = node; + } + tmp.parent = node.parent; + if (!node.parent) { + this.root = tmp; + } else { + if (node === node.parent.left) { + node.parent.left = tmp; + } else { + node.parent.right = tmp; + } + } + tmp.right = node; + node.parent = tmp; + } + + /** + * Right right case: rotate left + * + * a b + * / \ / \ + * c b -> rotationRR(a) -> a e + * / \ / \ + * d e c d + * + * @param node Node + */ + private rotationRR(node: RedBlackNode) { + const tmp = node.right; + node.right = tmp.left; + if (tmp.left && tmp.left.key) { + tmp.left.parent = node; + } + tmp.parent = node.parent; + if (!node.parent) { + this.root = tmp; + } else { + if (node === node.parent.left) { + node.parent.left = tmp; + } else { + node.parent.right = tmp; + } + } + tmp.left = node; + node.parent = tmp; + } + + insert(key: T) { + // special case: first key + if (this.root == null) { + this.root = new RedBlackNode(key); + this.root.color = Colors.BLACK; + } else { + const newNode = this.insertNode(this.root, key); + this.fixTreeProperties(newNode); + } + } + + protected insertNode(node: RedBlackNode, key: T): RedBlackNode { + if (this.compareFn(key, node.key) === Compare.LESS_THAN) { + if (node.left == null) { + node.left = new RedBlackNode(key); + node.left.parent = node; + return node.left; + } else { + return this.insertNode(node.left, key); + } + } else if (node.right == null) { + node.right = new RedBlackNode(key); + node.right.parent = node; + return node.right; + } else { + return this.insertNode(node.right, key); + } + } + + private fixTreeProperties(node: RedBlackNode) { + while (node && node.parent && node.parent.color === Colors.RED && node.color !== Colors.BLACK) { + let parent = node.parent; + const grandParent = parent.parent; + + // case A + if (grandParent && grandParent.left === parent) { + + const uncle = grandParent.right; + + // case 1: uncle of node is also red - only recoloring + if (uncle && uncle.isRed()) { + grandParent.color = Colors.RED; + parent.color = Colors.BLACK; + uncle.color = Colors.BLACK; + node = grandParent; + } else { + // case 2: node is right child - left rotate + if (node === parent.right) { + this.rotationRR(parent); + node = parent; + parent = node.parent; + } + + // case 3: node is left child - right rotate + this.rotationLL(grandParent); + // swap color + parent.color = Colors.BLACK; + grandParent.color = Colors.RED; + node = parent; + } + + } else { // case B: parent is right child of grand parent + + const uncle = grandParent.left; + + // case 1: uncle is read - only recoloring + if (uncle && uncle.isRed()) { + grandParent.color = Colors.RED; + parent.color = Colors.BLACK; + uncle.color = Colors.BLACK; + node = grandParent; + } else { + // case 2: node is left child - left rotate + if (node === parent.left) { + this.rotationLL(parent); + node = parent; + parent = node.parent; + } + + // case 3: node is right child - left rotate + this.rotationRR(grandParent); + // swap color + parent.color = Colors.BLACK; + grandParent.color = Colors.RED; + node = parent; + } + } + } + this.root.color = Colors.BLACK; + } + + getRoot() { + return this.root; + } + + /* private flipColors(node: RedBlackNode) { + node.left.flipColor(); + node.right.flipColor(); + } + + private isRed(node: RedBlackNode) { + if (!node) { + return false; + } + return node.isRed(); + }*/ +} diff --git a/src/ts/data-structures/set.ts b/src/ts/data-structures/set.ts new file mode 100644 index 00000000..a6d37373 --- /dev/null +++ b/src/ts/data-structures/set.ts @@ -0,0 +1,105 @@ +export default class Set { + private items: any; + + constructor() { + this.items = {}; + } + + add(element: T) { + if (!this.has(element)) { + this.items[element] = element; + return true; + } + return false; + } + + delete(element: T) { + if (this.has(element)) { + delete this.items[element]; + return true; + } + return false; + } + + has(element: T) { + // return this.items.hasOwnProperty(element); + return Object.prototype.hasOwnProperty.call(this.items, element); + } + + values(): T[] { + return Object.values(this.items); + } + + union(otherSet: Set) { + const unionSet = new Set(); + + this.values().forEach(value => unionSet.add(value)); + otherSet.values().forEach(value => unionSet.add(value)); + + return unionSet; + } + + intersection(otherSet: Set) { + const intersectionSet = new Set(); + + const values = this.values(); + const otherValues = otherSet.values(); + + let biggerSet = values; + let smallerSet = otherValues; + + if (otherValues.length - values.length > 0) { + biggerSet = otherValues; + smallerSet = values; + } + + smallerSet.forEach(value => { + if (biggerSet.includes(value)) { + intersectionSet.add(value); + } + }); + + return intersectionSet; + } + + difference(otherSet: Set) { + const differenceSet = new Set(); + + this.values().forEach(value => { + if (!otherSet.has(value)) { + differenceSet.add(value); + } + }); + + return differenceSet; + } + + isSubsetOf(otherSet: Set) { + const values = this.values(); + return values.every((value) => otherSet.has(value)); + } + + isEmpty() { + return this.size() === 0; + } + + size() { + return Object.keys(this.items).length; + } + + clear() { + this.items = {}; + } + + toString() { + if (this.isEmpty()) { + return ''; + } + const values = this.values(); + let objString = `${values[0]}`; + for (let i = 1; i < values.length; i++) { + objString = `${objString},${values[i].toString()}`; + } + return objString; + } +} diff --git a/src/ts/data-structures/sorted-linked-list.ts b/src/ts/data-structures/sorted-linked-list.ts new file mode 100644 index 00000000..f7832e81 --- /dev/null +++ b/src/ts/data-structures/sorted-linked-list.ts @@ -0,0 +1,43 @@ +import { Compare, defaultCompare, defaultEquals, ICompareFunction, IEqualsFunction } from '../util'; +import LinkedList from './linked-list'; + +export default class SortedLinkedList extends LinkedList { + constructor( + protected equalsFn: IEqualsFunction = defaultEquals, + protected compareFn: ICompareFunction = defaultCompare + ) { + super(equalsFn); + } + + push(element: T) { + if (this.isEmpty()) { + super.push(element); + } else { + const index = this.getIndexNextSortedElement(element); + super.insert(element, index); + } + } + + insert(element: T, index: number = 0) { + if (this.isEmpty()) { + return super.insert(element, 0); + } + index = this.getIndexNextSortedElement(element); + return super.insert(element, index); + } + + private getIndexNextSortedElement(element: T) { + let current = this.head; + let i = 0; + + for (; i < this.size() && current; i++) { + const comp = this.compareFn(element, current.element); + if (comp === Compare.LESS_THAN) { + return i; + } + current = current.next; + } + + return i; + } +} diff --git a/src/ts/data-structures/stack-linked-list.ts b/src/ts/data-structures/stack-linked-list.ts new file mode 100644 index 00000000..fa39023b --- /dev/null +++ b/src/ts/data-structures/stack-linked-list.ts @@ -0,0 +1,44 @@ +import DoublyLinkedList from './doubly-linked-list'; + +export default class StackLinkedList { + private items: DoublyLinkedList; + + constructor() { + this.items = new DoublyLinkedList(); + } + + push(element: T) { + this.items.push(element); + } + + pop() { + if (this.isEmpty()) { + return undefined; + } + const result = this.items.removeAt(this.size() - 1); + return result; + } + + peek() { + if (this.isEmpty()) { + return undefined; + } + return this.items.getElementAt(this.size() - 1).element; + } + + isEmpty() { + return this.items.isEmpty(); + } + + size() { + return this.items.size(); + } + + clear() { + this.items.clear(); + } + + toString() { + return this.items.toString(); + } +} diff --git a/src/ts/index.ts b/src/ts/index.ts index 198a42e2..cc8aec85 100644 --- a/src/ts/index.ts +++ b/src/ts/index.ts @@ -1,8 +1,105 @@ +import * as _util from './util'; +export const util = _util; + +export { default as Stack } from './data-structures/stack'; + +export { default as LinkedList } from './data-structures/linked-list'; +export { default as DoublyLinkedList } from './data-structures/doubly-linked-list'; +export { default as CircularLinkedList } from './data-structures/circular-linked-list'; +export { default as SortedLinkedList } from './data-structures/sorted-linked-list'; +export { default as StackLinkedList } from './data-structures/stack-linked-list'; +export { default as Set } from './data-structures/set'; +export { default as Dictionary } from './data-structures/dictionary'; +export { default as HashTable } from './data-structures/hash-table'; +export { default as HashTableSeparateChaining } from './data-structures/hash-table-separate-chaining'; +export { default as HashTableLinearProbing } from './data-structures/hash-table-linear-probing'; +export { default as HashTableLinearProbingLazy } from './data-structures/hash-table-linear-probing-lazy'; + +// chapter 08 +export { factorialIterative as factorialIterative } from './others/factorial'; +export { factorial as factorial} from './others/factorial'; +export { fibonacci as fibonacci} from './others/fibonacci'; +export { fibonacciIterative as fibonacciIterative} from './others/fibonacci'; +export { fibonacciMemoization as fibonacciMemoization} from './others/fibonacci'; + +// chapter 09 +export { default as BinarySearchTree } from './data-structures/binary-search-tree'; +export { default as AVLTree } from './data-structures/avl-tree'; +export { default as RedBlackTree } from './data-structures/red-black-tree'; + +// chapter 10 +export { MinHeap as MinHeap } from './data-structures/heap'; +export { MaxHeap as MaxHeap } from './data-structures/heap'; +export { default as heapSort } from './algorithms/sorting/heap-sort'; + +// chapter 11 +export { default as Graph } from './data-structures/graph'; +export { breadthFirstSearch as breadthFirstSearch } from './algorithms/graph/breadth-first-search'; +export { bfs as BFS } from './algorithms/graph/breadth-first-search'; +export { depthFirstSearch as depthFirstSearch } from './algorithms/graph/depth-first-search'; +export { DFS as DFS } from './algorithms/graph/depth-first-search'; +export { dijkstra as dijkstra } from './algorithms/graph/dijkstra'; +export { floydWarshall as floydWarshall } from './algorithms/graph/floyd-warshall'; +export { prim as prim } from './algorithms/graph/prim'; +export { kruskal as kruskal } from './algorithms/graph/kruskal'; + +// chapter 12 +export { shuffle as shuffle } from './algorithms/shuffle/fisher–yates'; + +export { bubbleSort as bubbleSort } from './algorithms/sorting/bubble-sort'; +export { modifiedBubbleSort as modifiedBubbleSort } from './algorithms/sorting/bubble-sort-improved'; +export { bucketSort as bucketSort } from './algorithms/sorting/bucket-sort'; +export { countingSort as countingSort } from './algorithms/sorting/counting-sort'; +export { insertionSort as insertionSort } from './algorithms/sorting/insertion-sort'; +export { mergeSort as mergeSort } from './algorithms/sorting/merge-sort'; +export { quickSort as quickSort } from './algorithms/sorting/quicksort'; +export { radixSort as radixSort } from './algorithms/sorting/radix-sort'; +export { selectionSort as selectionSort } from './algorithms/sorting/selection-sort'; +export { shellSort as shellSort } from './algorithms/sorting/shell-sort'; + +export { binarySearch as binarySearch } from './algorithms/search/binary-search'; +export { interpolationSearch as interpolationSearch } from './algorithms/search/interpolation-search'; +export { sequentialSearch as sequentialSearch } from './algorithms/search/sequential-search'; +export { findMaxValue as findMaxValue } from './algorithms/search/min-max-search'; +export { findMinValue as findMinValue } from './algorithms/search/min-max-search'; + +// chapter 14 +export { binarySearch as binarySearchRecursive } from './algorithms/search/binary-search-recursive'; +export { minCoinChange } from './algorithms/dynamic-programing/min-coin-change'; +export { minCoinChange as minCoinChangeGreedy } from './algorithms/greedy/min-coin-change'; +export { knapSack } from './algorithms/dynamic-programing/knapsack'; +export { knapSack as knapSackRecursive } from './algorithms/dynamic-programing/knapsack-recursive'; +export { knapSack as knapSackGreedy } from './algorithms/greedy/knapsack'; +export { lcs } from './algorithms/dynamic-programing/longest-common-subsequence'; +export { lcs as lcsPrint } from './algorithms/dynamic-programing/longest-common-subsequence-print'; +export { lcs as lcsRecursive } from './algorithms/greedy/longest-common-subsequence'; +export { matrixChainOrder } from './algorithms/dynamic-programing/matrix-chain-multiplication'; +export { matrixChainOrder as matrixChainOrderGreedy } from './algorithms/greedy/matrix-chain-multiplication'; +export { ratInAMaze } from './algorithms/backtracking/rat-in-maze'; +export { sudokuSolver } from './algorithms/backtracking/sudoku-solver'; + +// others +export { findDivisors } from './algorithms/math/find-divisors'; +export { gcd } from './algorithms/math/gcd'; +export { lcm } from './algorithms/math/lcm'; +export { greatestDifference } from './algorithms/math/greatest-difference'; +export { isPrime } from './algorithms/math/primality-test'; +export { testPrime } from './algorithms/math/primality-test'; +export { isPrime2 } from './algorithms/math/primality-test'; +export { sieveOfEratosthenes } from './algorithms/math/sieve-eratosthenes'; + + +/* import { hotPotato } from './others/hot-potato'; +import { palindromeChecker } from './others/palindrome-checker'; +import Deque from './data-structures/deque'; +import Queue from './data-structures/queue'; import { hanoi, hanoiStack } from './others/hanoi'; import { baseConverter, decimalToBinary } from './others/base-converter'; import StackArray from './data-structures/stack-array'; import Stack from './data-structures/stack'; import { parenthesesChecker } from './others/balanced-symbols'; +import { MinHeap, MaxHeap } from './data-structures/heap'; + export { Stack, @@ -11,5 +108,9 @@ export { baseConverter, decimalToBinary, hanoi, - hanoiStack -}; + hanoiStack, + Queue, + Deque, + hotPotato, + palindromeChecker +}; */ diff --git a/src/ts/others/balanced-symbols.ts b/src/ts/others/balanced-symbols.ts index cf8c2fe4..f20b5830 100644 --- a/src/ts/others/balanced-symbols.ts +++ b/src/ts/others/balanced-symbols.ts @@ -10,34 +10,20 @@ export function parenthesesChecker(symbols: string) { let top: string; while (index < symbols.length && balanced) { - symbol = symbols.charAt(index); + symbol = symbols[index]; if (opens.indexOf(symbol) >= 0) { stack.push(symbol); - // console.log(`open symbol - stacking ${symbol}`); } else { - // console.log(`close symbol ${symbol}`); if (stack.isEmpty()) { balanced = false; - // console.log('Stack is empty, no more symbols to pop and compare'); } else { top = stack.pop(); - // if (!matches(top, symbol)){ if (!(opens.indexOf(top) === closers.indexOf(symbol))) { balanced = false; - /* console.log( - `poping symbol ${top} - is not a match compared to ${symbol}` - ); */ - } /* else { - console.log( - `poping symbol ${top} - is is a match compared to ${symbol}` - ); - } */ + } } } index++; } - if (balanced && stack.isEmpty()) { - return true; - } - return false; + return balanced && stack.isEmpty(); } diff --git a/src/ts/others/factorial.ts b/src/ts/others/factorial.ts new file mode 100644 index 00000000..e6e4cea9 --- /dev/null +++ b/src/ts/others/factorial.ts @@ -0,0 +1,20 @@ +export function factorialIterative(number: number) { + if (number < 0) { + return undefined; + } + let total = 1; + for (let n = number; n > 1; n--) { + total *= n; + } + return total; +} + +export function factorial(n: number): number { + if (n < 0) { + return undefined; + } + if (n === 1 || n === 0) { + return 1; + } + return n * factorial(n - 1); +} diff --git a/src/ts/others/fibonacci.ts b/src/ts/others/fibonacci.ts new file mode 100644 index 00000000..32d8db4f --- /dev/null +++ b/src/ts/others/fibonacci.ts @@ -0,0 +1,29 @@ +export function fibonacci(n: number): number { + if (n < 1) { return 0; } // {1} + if (n <= 2) { return 1; } // {2} + return fibonacci(n - 1) + fibonacci(n - 2); // {3} +} + +export function fibonacciIterative(n: number) { + if (n < 1) { return 0; } + let fibNMinus2 = 0; + let fibNMinus1 = 1; + let fibN = n; + for (let i = 2; i <= n; i++) { + // n >= 2 + fibN = fibNMinus1 + fibNMinus2; // f(n-1) + f(n-2) + fibNMinus2 = fibNMinus1; + fibNMinus1 = fibN; + } + return fibN; +} + +export function fibonacciMemoization(n: number) { + if (n < 1) { return 0; } + const memo = [0, 1]; + const fibonacciMem = (num: number): number => { + if (memo[num] != null) { return memo[num]; } + return (memo[num] = fibonacciMem(num - 1) + fibonacciMem(num - 2)); + }; + return fibonacciMem(n); +} diff --git a/src/ts/others/hot-potato.ts b/src/ts/others/hot-potato.ts new file mode 100644 index 00000000..f6eb8349 --- /dev/null +++ b/src/ts/others/hot-potato.ts @@ -0,0 +1,22 @@ +import Queue from '../data-structures/queue'; + +export function hotPotato(elementsList: any[], num: number) { + const queue = new Queue(); + const elimitatedList = []; + + for (let i = 0; i < elementsList.length; i++) { + queue.enqueue(elementsList[i]); + } + + while (queue.size() > 1) { + for (let i = 0; i < num; i++) { + queue.enqueue(queue.dequeue()); + } + elimitatedList.push(queue.dequeue()); + } + + return { + elimitated: elimitatedList, + winner: queue.dequeue() + }; +} diff --git a/src/ts/others/palindrome-checker.ts b/src/ts/others/palindrome-checker.ts new file mode 100644 index 00000000..4742d1cd --- /dev/null +++ b/src/ts/others/palindrome-checker.ts @@ -0,0 +1,27 @@ +import Deque from '../data-structures/deque'; + +export function palindromeChecker(aString: string) { + + if (aString === undefined || aString === null || + (aString !== null && aString.length === 0)) { + return false; + } + + const deque = new Deque(); + const lowerString = aString.toLocaleLowerCase().split(' ').join(''); + let firstChar: string, lastChar: string; + + for (let i = 0; i < lowerString.length; i++) { + deque.addBack(lowerString.charAt(i)); + } + + while (deque.size() > 1) { + firstChar = deque.removeFront(); + lastChar = deque.removeBack(); + if (firstChar !== lastChar) { + return false; + } + } + + return true; +} diff --git a/src/ts/util.ts b/src/ts/util.ts new file mode 100644 index 00000000..8c9f75f0 --- /dev/null +++ b/src/ts/util.ts @@ -0,0 +1,60 @@ +export type ICompareFunction = (a: T, b: T) => number; + +export type IEqualsFunction = (a: T, b: T) => boolean; + +export type IDiffFunction = (a: T, b: T) => number; + +export const DOES_NOT_EXIST = -1; + +export enum Compare { + LESS_THAN = -1, + BIGGER_THAN = 1, + EQUALS = 0 +} + +export function lesserEquals(a: T, b: T, compareFn: ICompareFunction) { + const comp = compareFn(a, b); + return comp === Compare.LESS_THAN || comp === Compare.EQUALS; +} + +export function biggerEquals(a: T, b: T, compareFn: ICompareFunction) { + const comp = compareFn(a, b); + return comp === Compare.BIGGER_THAN || comp === Compare.EQUALS; +} + +export function defaultCompare(a: T, b: T): number { + if (a === b) { + return Compare.EQUALS; + } + return a < b ? Compare.LESS_THAN : Compare.BIGGER_THAN; +} + +export function defaultEquals(a: T, b: T): boolean { + return a === b; +} + +export function defaultToString(item: any): string { + if (item === null) { + return 'NULL'; + } else if (item === undefined) { + return 'UNDEFINED'; + } else if (typeof item === 'string' || item instanceof String) { + return `${item}`; + } + return item.toString(); +} + +export function swap(array: any[], a: number, b: number) { + /* const temp = array[a]; + array[a] = array[b]; + array[b] = temp; */ + [array[a], array[b]] = [array[b], array[a]]; +} + +export function reverseCompare(compareFn: ICompareFunction): ICompareFunction { + return (a, b) => compareFn(b, a); +} + +export function defaultDiff(a: T, b: T): number { + return Number(a) - Number(b); +} diff --git a/test/js/algorithms/backtracking/rat-in-maze.spec.js b/test/js/algorithms/backtracking/rat-in-maze.spec.js new file mode 100644 index 00000000..b88e1d60 --- /dev/null +++ b/test/js/algorithms/backtracking/rat-in-maze.spec.js @@ -0,0 +1,21 @@ +import 'mocha'; +import { expect } from 'chai'; +import { ratInAMaze } from '../../../../src/js/index'; + +describe('Rat in a maze', () => { + it('rat in a maze solver', () => { + const maze = [ + [1, 0, 0, 0], + [1, 1, 1, 1], + [0, 0, 1, 0], + [0, 1, 1, 1] + ]; + const solution = [ + [1, 0, 0, 0], + [1, 1, 1, 0], + [0, 0, 1, 0], + [0, 0, 1, 1] + ]; + expect(ratInAMaze(maze)).to.deep.equal(solution); + }); +}); diff --git a/test/js/algorithms/backtracking/sudoku-solver.spec.js b/test/js/algorithms/backtracking/sudoku-solver.spec.js new file mode 100644 index 00000000..f4d8c216 --- /dev/null +++ b/test/js/algorithms/backtracking/sudoku-solver.spec.js @@ -0,0 +1,57 @@ +import 'mocha'; +import { expect } from 'chai'; +import { sudokuSolver } from '../../../../src/js/index'; + +describe('Sudoku Solver', () => { + it('sudoku solver', () => { + const grid = [ + [3, 0, 6, 5, 0, 8, 4, 0, 0], + [5, 2, 0, 0, 0, 0, 0, 0, 0], + [0, 8, 7, 0, 0, 0, 0, 3, 1], + [0, 0, 3, 0, 1, 0, 0, 8, 0], + [9, 0, 0, 8, 6, 3, 0, 0, 5], + [0, 5, 0, 0, 9, 0, 6, 0, 0], + [1, 3, 0, 0, 0, 0, 2, 5, 0], + [0, 0, 0, 0, 0, 0, 0, 7, 4], + [0, 0, 5, 2, 0, 6, 3, 0, 0] + ]; + const solution = [ + [3, 1, 6, 5, 7, 8, 4, 9, 2], + [5, 2, 9, 1, 3, 4, 7, 6, 8], + [4, 8, 7, 6, 2, 9, 5, 3, 1], + [2, 6, 3, 4, 1, 5, 9, 8, 7], + [9, 7, 4, 8, 6, 3, 1, 2, 5], + [8, 5, 1, 7, 9, 2, 6, 4, 3], + [1, 3, 8, 9, 4, 7, 2, 5, 6], + [6, 9, 2, 3, 5, 1, 8, 7, 4], + [7, 4, 5, 2, 8, 6, 3, 1, 9] + ]; + expect(sudokuSolver(grid)).to.deep.equal(solution); + }); + + it('sudoku solver 2', () => { + const grid = [ + [5, 3, 0, 0, 7, 0, 0, 0, 0], + [6, 0, 0, 1, 9, 5, 0, 0, 0], + [0, 9, 8, 0, 0, 0, 0, 6, 0], + [8, 0, 0, 0, 6, 0, 0, 0, 3], + [4, 0, 0, 8, 0, 3, 0, 0, 1], + [7, 0, 0, 0, 2, 0, 0, 0, 6], + [0, 6, 0, 0, 0, 0, 2, 8, 0], + [0, 0, 0, 4, 1, 9, 0, 0, 5], + [0, 0, 0, 0, 8, 0, 0, 7, 9] + ]; + const solution = [ + [5, 3, 4, 6, 7, 8, 9, 1, 2], + [6, 7, 2, 1, 9, 5, 3, 4, 8], + [1, 9, 8, 3, 4, 2, 5, 6, 7], + [8, 5, 9, 7, 6, 1, 4, 2, 3], + [4, 2, 6, 8, 5, 3, 7, 9, 1], + [7, 1, 3, 9, 2, 4, 8, 5, 6], + [9, 6, 1, 5, 3, 7, 2, 8, 4], + [2, 8, 7, 4, 1, 9, 6, 3, 5], + [3, 4, 5, 2, 8, 6, 1, 7, 9] + ]; + expect(sudokuSolver(grid)).to.deep.equal(solution); + }); +}); diff --git a/test/js/algorithms/dynamic-programming/knapsack-recursive.spec.js b/test/js/algorithms/dynamic-programming/knapsack-recursive.spec.js new file mode 100644 index 00000000..589b8e9d --- /dev/null +++ b/test/js/algorithms/dynamic-programming/knapsack-recursive.spec.js @@ -0,0 +1,15 @@ +import 'mocha'; +import { expect } from 'chai'; +import { knapSackRecursive } from '../../../../src/js/index'; + +describe('KnapSack Dynamic Programming - Recursive', () => { + + it('works with recursive approach', () => { + const values = [3, 4, 5]; + const weights = [2, 3, 4]; + const capacity = 5; + const n = values.length; + + expect(knapSackRecursive(capacity, weights, values, n)).to.equal(7); + }); +}); diff --git a/test/js/algorithms/dynamic-programming/knapsack.spec.js b/test/js/algorithms/dynamic-programming/knapsack.spec.js new file mode 100644 index 00000000..47e2ab37 --- /dev/null +++ b/test/js/algorithms/dynamic-programming/knapsack.spec.js @@ -0,0 +1,15 @@ +import 'mocha'; +import { expect } from 'chai'; +import { knapSack } from '../../../../src/js/index'; + +describe('KnapSack Dynamic Programming', () => { + + it('works with DP approach', () => { + const values = [3, 4, 5]; + const weights = [2, 3, 4]; + const capacity = 5; + const n = values.length; + + expect(knapSack(capacity, weights, values, n)).to.equal(7); + }); +}); diff --git a/test/js/algorithms/dynamic-programming/longest-common-subsequence-print.spec.js b/test/js/algorithms/dynamic-programming/longest-common-subsequence-print.spec.js new file mode 100644 index 00000000..8b5ba9fe --- /dev/null +++ b/test/js/algorithms/dynamic-programming/longest-common-subsequence-print.spec.js @@ -0,0 +1,13 @@ +import 'mocha'; +import { expect } from 'chai'; +import { lcsPrint } from '../../../../src/js/index'; + +describe('LCS Dynamic Programming with print solution', () => { + + it('works with DP approach with print solution', () => { + const wordX = 'acbaed'; + const wordY = 'abcadf'; + + expect(lcsPrint(wordX, wordY)).to.equal('acad'); + }); +}); diff --git a/test/js/algorithms/dynamic-programming/longest-common-subsequence.spec.js b/test/js/algorithms/dynamic-programming/longest-common-subsequence.spec.js new file mode 100644 index 00000000..121cf4fa --- /dev/null +++ b/test/js/algorithms/dynamic-programming/longest-common-subsequence.spec.js @@ -0,0 +1,13 @@ +import 'mocha'; +import { expect } from 'chai'; +import { lcs } from '../../../../src/js/index'; + +describe('LCS Dynamic Programming', () => { + + it('works with DP approach', () => { + const wordX = 'acbaed'; + const wordY = 'abcadf'; + + expect(lcs(wordX, wordY)).to.equal(4); + }); +}); diff --git a/test/js/algorithms/dynamic-programming/matrix-chain-multiplication.spec.js b/test/js/algorithms/dynamic-programming/matrix-chain-multiplication.spec.js new file mode 100644 index 00000000..db1972e3 --- /dev/null +++ b/test/js/algorithms/dynamic-programming/matrix-chain-multiplication.spec.js @@ -0,0 +1,12 @@ +import 'mocha'; +import { expect } from 'chai'; +import { matrixChainOrder } from '../../../../src/js/index'; + +describe('Matrix Chain Multiplication', () => { + + it('works with DP approach', () => { + const p = [10, 100, 5, 50, 1]; + + expect(matrixChainOrder(p)).to.equal(1750); + }); +}); diff --git a/test/js/algorithms/dynamic-programming/min-coin-change.spec.js b/test/js/algorithms/dynamic-programming/min-coin-change.spec.js new file mode 100644 index 00000000..ecc8be1b --- /dev/null +++ b/test/js/algorithms/dynamic-programming/min-coin-change.spec.js @@ -0,0 +1,30 @@ +import 'mocha'; +import { expect } from 'chai'; +import { minCoinChange } from '../../../../src/js/index'; + +describe('Dynamic Programming: Min Coin Change', () => { + + it('works with amount 0', () => { + expect(minCoinChange([1, 2, 3], 0)).to.deep.equal([]); + }); + + it('works with amount 1', () => { + expect(minCoinChange([1, 2, 3], 1)).to.deep.equal([1]); + }); + + it('works with amount 2', () => { + expect(minCoinChange([1, 2, 3], 2)).to.deep.equal([2]); + }); + + it('works with amount 3', () => { + expect(minCoinChange([1, 2, 3], 3)).to.deep.equal([3]); + }); + + it('works with amount 4', () => { + expect(minCoinChange([1, 2, 3], 4)).to.deep.equal([1, 3]); + }); + + it('works with amount 6', () => { + expect(minCoinChange([1, 2, 3], 6)).to.deep.equal([3, 3]); + }); +}); diff --git a/test/js/algorithms/graph/breadth-first-search.spec.js b/test/js/algorithms/graph/breadth-first-search.spec.js new file mode 100644 index 00000000..1d7b5e75 --- /dev/null +++ b/test/js/algorithms/graph/breadth-first-search.spec.js @@ -0,0 +1,65 @@ +import 'mocha'; +import { expect } from 'chai'; +import { BFS, breadthFirstSearch, Graph } from '../../../../src/js/index'; + +describe('Breadth First Search', () => { + let count; + const vertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']; + let graph; + + function assertCallback(value) { + expect(value).to.equal(vertices[count]); + count++; + } + + beforeEach(() => { + count = 0; + graph = new Graph(); + + for (let i = 0; i < vertices.length; i++) { + graph.addVertex(vertices[i]); + } + + graph.addEdge('A', 'B'); + graph.addEdge('A', 'C'); + graph.addEdge('A', 'D'); + graph.addEdge('C', 'D'); + graph.addEdge('C', 'G'); + graph.addEdge('D', 'G'); + graph.addEdge('D', 'H'); + graph.addEdge('B', 'E'); + graph.addEdge('B', 'F'); + graph.addEdge('E', 'I'); + }); + + it('breadthFirstSearch', () => { + breadthFirstSearch(graph, vertices[0], assertCallback); + }); + + it('sorthest path - BFS', () => { + const shortestPathA = BFS(graph, vertices[0]); + + expect(shortestPathA.distances).to.deep.equal({ + A: 0, + B: 1, + C: 1, + D: 1, + E: 2, + F: 2, + G: 2, + H: 2, + I: 3 + }); + expect(shortestPathA.predecessors).to.deep.equal({ + A: null, + B: 'A', + C: 'A', + D: 'A', + E: 'B', + F: 'B', + G: 'C', + H: 'D', + I: 'E' + }); + }); +}); diff --git a/test/js/algorithms/graph/depth-first-search.spec.js b/test/js/algorithms/graph/depth-first-search.spec.js new file mode 100644 index 00000000..e0cbcde9 --- /dev/null +++ b/test/js/algorithms/graph/depth-first-search.spec.js @@ -0,0 +1,64 @@ +import 'mocha'; +import { expect } from 'chai'; +import { DFS, depthFirstSearch, Graph } from '../../../../src/js/index'; + +describe('Depth First Search', () => { + let count; + const vertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']; + const dfsCallBack = ['A', 'B', 'E', 'I', 'F', 'C', 'D', 'G', 'H']; + let graph; + + beforeEach(() => { + count = 0; + graph = new Graph(true); + }); + + function assertCallback(value) { + expect(value).to.equal(dfsCallBack[count]); + count++; + } + + it('depthFirstSearch', () => { + for (let i = 0; i < vertices.length; i++) { + graph.addVertex(vertices[i]); + } + + graph.addEdge('A', 'B'); + graph.addEdge('A', 'C'); + graph.addEdge('A', 'D'); + graph.addEdge('C', 'D'); + graph.addEdge('C', 'G'); + graph.addEdge('D', 'G'); + graph.addEdge('D', 'H'); + graph.addEdge('B', 'E'); + graph.addEdge('B', 'F'); + graph.addEdge('E', 'I'); + + depthFirstSearch(graph, assertCallback); + }); + + it('topological sort - DFS', () => { + const myVertices = ['A', 'B', 'C', 'D', 'E', 'F']; + for (let i = 0; i < myVertices.length; i++) { + graph.addVertex(myVertices[i]); + } + graph.addEdge('A', 'C'); + graph.addEdge('A', 'D'); + graph.addEdge('B', 'D'); + graph.addEdge('B', 'E'); + graph.addEdge('C', 'F'); + graph.addEdge('F', 'E'); + + const result = DFS(graph); + + expect(result.discovery).to.deep.equal({ + A: 1, B: 11, C: 2, D: 8, E: 4, F: 3 + }); + expect(result.finished).to.deep.equal({ + A: 10, B: 12, C: 7, D: 9, E: 5, F: 6 + }); + expect(result.predecessors).to.deep.equal({ + A: null, B: null, C: 'A', D: 'A', E: 'F', F: 'C' + }); + }); +}); diff --git a/test/js/algorithms/graph/dijkstra.spec.js b/test/js/algorithms/graph/dijkstra.spec.js new file mode 100644 index 00000000..7a88f040 --- /dev/null +++ b/test/js/algorithms/graph/dijkstra.spec.js @@ -0,0 +1,21 @@ +import 'mocha'; +import { expect } from 'chai'; +import { dijkstra } from '../../../../src/js/index'; + +describe('Dijkstra\'s Algorithm - Shortest Path', () => { + + it('Shortest Path', () => { + const graph = [ + [0, 2, 4, 0, 0, 0], + [0, 0, 2, 4, 2, 0], + [0, 0, 0, 0, 3, 0], + [0, 0, 0, 0, 0, 2], + [0, 0, 0, 3, 0, 2], + [0, 0, 0, 0, 0, 0] + ]; + + expect(dijkstra(graph, 0)).to.deep.equal([0, 2, 4, 6, 4, 6]); + + }); + +}); diff --git a/test/js/algorithms/graph/floyd-warshall.spec.js b/test/js/algorithms/graph/floyd-warshall.spec.js new file mode 100644 index 00000000..0f62cb7a --- /dev/null +++ b/test/js/algorithms/graph/floyd-warshall.spec.js @@ -0,0 +1,26 @@ +import 'mocha'; +import { expect } from 'chai'; +import { floydWarshall } from '../../../../src/js/index'; + +describe('Floyd-Warshall Algorithm - All-Pairs Shortest Path', () => { + it('All-Pairs Shortest Path', () => { + const INF = Infinity; + const graph = [ + [INF, 2, 4, INF, INF, INF], + [INF, INF, 2, 4, 2, INF], + [INF, INF, INF, INF, 3, INF], + [INF, INF, INF, INF, INF, 2], + [INF, INF, INF, 3, INF, 2], + [INF, INF, INF, INF, INF, INF] + ]; + + expect(floydWarshall(graph)).to.deep.equal([ + [0, 2, 4, 6, 4, 6], + [INF, 0, 2, 4, 2, 4], + [INF, INF, 0, 6, 3, 5], + [INF, INF, INF, 0, INF, 2], + [INF, INF, INF, 3, 0, 2], + [INF, INF, INF, INF, INF, 0] + ]); + }); +}); diff --git a/test/js/algorithms/graph/kruskal.spec.js b/test/js/algorithms/graph/kruskal.spec.js new file mode 100644 index 00000000..38a2132c --- /dev/null +++ b/test/js/algorithms/graph/kruskal.spec.js @@ -0,0 +1,18 @@ +import 'mocha'; +import { expect } from 'chai'; +import { kruskal } from '../../../../src/js/index'; + +describe('Kruskal Algorithm - Minimum Spanning Tree', () => { + it('Minimum Spanning Tree', () => { + const graph = [ + [0, 2, 4, 0, 0, 0], + [2, 0, 2, 4, 2, 0], + [4, 2, 0, 0, 3, 0], + [0, 4, 0, 0, 3, 2], + [0, 2, 3, 3, 0, 2], + [0, 0, 0, 2, 2, 0] + ]; + + expect(kruskal(graph)).to.deep.equal([ , 0, 1, 1, 1, 3]); + }); +}); diff --git a/test/js/algorithms/graph/prim.spec.js b/test/js/algorithms/graph/prim.spec.js new file mode 100644 index 00000000..9e0b6b31 --- /dev/null +++ b/test/js/algorithms/graph/prim.spec.js @@ -0,0 +1,18 @@ +import 'mocha'; +import { expect } from 'chai'; +import { prim } from '../../../../src/js/index'; + +describe('Prim\'s Algorithm - Minimum Spanning Tree', () => { + it('Minimum Spanning Tree', () => { + const graph = [ + [0, 2, 4, 0, 0, 0], + [2, 0, 2, 4, 2, 0], + [4, 2, 0, 0, 3, 0], + [0, 4, 0, 0, 3, 2], + [0, 2, 3, 3, 0, 2], + [0, 0, 0, 2, 2, 0] + ]; + + expect(prim(graph)).to.deep.equal([-1, 0, 1, 5, 1, 4]); + }); +}); diff --git a/test/js/algorithms/greedy/knapsack.spec.js b/test/js/algorithms/greedy/knapsack.spec.js new file mode 100644 index 00000000..39be668a --- /dev/null +++ b/test/js/algorithms/greedy/knapsack.spec.js @@ -0,0 +1,14 @@ +import 'mocha'; +import { expect } from 'chai'; +import { knapSackGreedy } from '../../../../src/js/index'; + +describe('KnapSack Greedy', () => { + + it('works with greedy approach', () => { + const values = [3, 4, 5]; + const weights = [2, 3, 4]; + const capacity = 5; + + expect(knapSackGreedy(capacity, weights, values)).to.equal(7); + }); +}); diff --git a/test/js/algorithms/greedy/longest-common-subsequence.spec.js b/test/js/algorithms/greedy/longest-common-subsequence.spec.js new file mode 100644 index 00000000..7be0e4c4 --- /dev/null +++ b/test/js/algorithms/greedy/longest-common-subsequence.spec.js @@ -0,0 +1,13 @@ +import 'mocha'; +import { expect } from 'chai'; +import { lcsRecursive } from '../../../../src/js/index'; + +describe('LCS Greedy', () => { + + it('works with Greedy approach', () => { + const wordX = 'acbaed'; + const wordY = 'abcadf'; + + expect(lcsRecursive(wordX, wordY)).to.equal(4); + }); +}); diff --git a/test/js/algorithms/greedy/matrix-chain-multiplication.spec.js b/test/js/algorithms/greedy/matrix-chain-multiplication.spec.js new file mode 100644 index 00000000..c9d53888 --- /dev/null +++ b/test/js/algorithms/greedy/matrix-chain-multiplication.spec.js @@ -0,0 +1,12 @@ +import 'mocha'; +import { expect } from 'chai'; +import { matrixChainOrderGreedy } from '../../../../src/js/index'; + +describe('Matrix Chain Multiplication', () => { + + it('works with DP approach', () => { + const p = [10, 100, 5, 50, 1]; + + expect(matrixChainOrderGreedy(p)).to.equal(1750); + }); +}); diff --git a/test/js/algorithms/greedy/min-coin-change.spec.js b/test/js/algorithms/greedy/min-coin-change.spec.js new file mode 100644 index 00000000..ffa0b674 --- /dev/null +++ b/test/js/algorithms/greedy/min-coin-change.spec.js @@ -0,0 +1,12 @@ +import 'mocha'; +import { expect } from 'chai'; +import { minCoinChangeGreedy } from '../../../../src/js/index'; + +describe('Min Coin Change Greedy', () => { + + it('works with greedy approach', () => { + expect(minCoinChangeGreedy([1, 5, 10], 15)).to.deep.equal([10, 5]); + expect(minCoinChangeGreedy([1, 3, 4], 6)).to.deep.equal([4, 1, 1]); + }); + +}); diff --git a/test/js/algorithms/search/binary-search-recursive.spec.js b/test/js/algorithms/search/binary-search-recursive.spec.js new file mode 100644 index 00000000..8aab4959 --- /dev/null +++ b/test/js/algorithms/search/binary-search-recursive.spec.js @@ -0,0 +1,4 @@ +import { binarySearchRecursive } from '../../../../src/js/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(binarySearchRecursive, 'Binary Search Recursive'); diff --git a/test/js/algorithms/search/binary-search.spec.js b/test/js/algorithms/search/binary-search.spec.js new file mode 100644 index 00000000..4e4014ce --- /dev/null +++ b/test/js/algorithms/search/binary-search.spec.js @@ -0,0 +1,20 @@ +import { expect } from 'chai'; +import { binarySearch } from '../../../../src/js/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(binarySearch, 'Binary Search'); + +describe('binarySearch', () => { + it('search elements in array of numbers', () => { + expect(binarySearch([0, 5, 3], 1)).to.equal(-1); + expect(binarySearch([2, 64, 33, 40, 100], 40)).to.equal(2); + expect(binarySearch([1, 2], 2)).to.equal(1); + expect(binarySearch([10, 20, 15, 40, 65], 40)).to.equal(3); + expect(binarySearch([1, 6, 7, 8, 12, 13, 14, 19, 21, 23, 24, 24, 24, 300], 24)).to.equal(10); + expect(binarySearch([1, 2, 3, 610, 800, 1250, 1360, 1400, 1905], 600)).to.equal(-1); + expect(binarySearch([1, 2, 3, 742, 800, 1250, 1360, 1400, 19550], 2)).to.equal(1); + expect(binarySearch([1, 2, 3, 743, 800, 1000, 1335, 1490, 1800], 743)).to.equal(3); + expect(binarySearch([1, 2, 3, 700, 800, 1233, 1380, 1400, 19678], 800)).to.equal(4); + expect(binarySearch([0, 10, 11, 12, 13, 14, 15], 10)).to.equal(1); + }); +}); diff --git a/test/js/algorithms/search/interpolation-search.spec.js b/test/js/algorithms/search/interpolation-search.spec.js new file mode 100644 index 00000000..1daff1cc --- /dev/null +++ b/test/js/algorithms/search/interpolation-search.spec.js @@ -0,0 +1,4 @@ +import { interpolationSearch } from '../../../../src/js/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(interpolationSearch, 'Interpolation Search', { customEquals: false }); diff --git a/test/js/algorithms/search/min-max-search.spec.js b/test/js/algorithms/search/min-max-search.spec.js new file mode 100644 index 00000000..0c789a2f --- /dev/null +++ b/test/js/algorithms/search/min-max-search.spec.js @@ -0,0 +1,31 @@ +import 'mocha'; +import { expect } from 'chai'; +import { findMinValue, findMaxValue } from '../../../../src/js/index'; + +describe('Min and Max Values Search', () => { + const SIZE = 10; + + function createSortedArray() { + const array = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('min value - works with empty arrays', () => { + expect(findMinValue([])).to.equal(undefined); + }); + + it('max value - works with empty arrays', () => { + expect(findMaxValue([])).to.equal(undefined); + }); + + it('min value', () => { + expect(findMinValue(createSortedArray())).to.equal(1); + }); + + it('max value', () => { + expect(findMaxValue(createSortedArray())).to.equal(SIZE); + }); +}); diff --git a/test/js/algorithms/search/search-algorithms-tests.js b/test/js/algorithms/search/search-algorithms-tests.js new file mode 100644 index 00000000..f0c698a2 --- /dev/null +++ b/test/js/algorithms/search/search-algorithms-tests.js @@ -0,0 +1,51 @@ +import 'mocha'; +import { expect } from 'chai'; + +const customEquals = (a, b) => a.key === b.key; + +export function testSearchAlgorithm( + searchAlgorithm, + algorithmName, + config = { customEquals: true } +) { + describe(algorithmName, () => { + const SIZE = 10; + + function createSortedArray() { + const array = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('works with empty arrays', () => { + expect(searchAlgorithm([], 1)).to.equal(-1); + }); + + it('finds value at the first position', () => { + const array = createSortedArray(); + expect(searchAlgorithm(array, 1)).to.equal(0); + }); + + it('finds value at the last position', () => { + const array = createSortedArray(); + expect(searchAlgorithm(array, SIZE)).to.equal(SIZE - 1); + }); + + it('finds value at different positions', () => { + const array = createSortedArray(); + + for (let value = 1; value <= SIZE; value++) { + expect(searchAlgorithm(array, value)).to.equal(value - 1); + } + }); + + if (config.customEquals) { + it('finds value with custom equals function', () => { + const array = [{ key: 1 }, { key: 2 }, { key: 3 }]; + expect(searchAlgorithm(array, { key: 2 }, customEquals)).to.equal(1); + }); + } + }); +} diff --git a/test/js/algorithms/search/sequential-search.spec.js b/test/js/algorithms/search/sequential-search.spec.js new file mode 100644 index 00000000..a308474e --- /dev/null +++ b/test/js/algorithms/search/sequential-search.spec.js @@ -0,0 +1,4 @@ +import { sequentialSearch } from '../../../../src/js/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(sequentialSearch, 'Sequential Search'); diff --git "a/test/js/algorithms/shuffle/fisher\342\200\223yates.spec.js" "b/test/js/algorithms/shuffle/fisher\342\200\223yates.spec.js" new file mode 100644 index 00000000..6e87916c --- /dev/null +++ "b/test/js/algorithms/shuffle/fisher\342\200\223yates.spec.js" @@ -0,0 +1,31 @@ +import 'mocha'; +import { expect } from 'chai'; +import { shuffle } from '../../../../src/js/index'; + +describe('Fisher-Yates Suffle', () => { + const SIZE = 100; + + function createSortedArray() { + const array = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('works with empty arrays', () => { + expect(shuffle([])).to.deep.equal([]); + }); + + it('works with arrays with a single value', () => { + const array = [1]; + expect(shuffle(array)).to.deep.equal(array); + }); + + it('works with sorted arrays', () => { + let array = createSortedArray(); + const sortedArray = createSortedArray(); + array = shuffle(array); + expect(array).to.not.deep.equal(sortedArray); + }); +}); diff --git a/test/js/algorithms/sorting/bubble-sort-improved.spec.js b/test/js/algorithms/sorting/bubble-sort-improved.spec.js new file mode 100644 index 00000000..1ad03b39 --- /dev/null +++ b/test/js/algorithms/sorting/bubble-sort-improved.spec.js @@ -0,0 +1,4 @@ +import { modifiedBubbleSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(modifiedBubbleSort, 'Bubble Sort - Improved'); diff --git a/test/js/algorithms/sorting/bubble-sort.spec.js b/test/js/algorithms/sorting/bubble-sort.spec.js new file mode 100644 index 00000000..b903df74 --- /dev/null +++ b/test/js/algorithms/sorting/bubble-sort.spec.js @@ -0,0 +1,4 @@ +import { bubbleSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(bubbleSort, 'Bubble Sort'); diff --git a/test/js/algorithms/sorting/bucket-sort.spec.js b/test/js/algorithms/sorting/bucket-sort.spec.js new file mode 100644 index 00000000..2a00d8db --- /dev/null +++ b/test/js/algorithms/sorting/bucket-sort.spec.js @@ -0,0 +1,4 @@ +import { bucketSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(bucketSort, 'Bucket Sort', { reverseCompare: false }); diff --git a/test/js/algorithms/sorting/counting-sort.spec.js b/test/js/algorithms/sorting/counting-sort.spec.js new file mode 100644 index 00000000..783a48a5 --- /dev/null +++ b/test/js/algorithms/sorting/counting-sort.spec.js @@ -0,0 +1,4 @@ +import { countingSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(countingSort, 'Counting Sort', { reverseCompare: false }); diff --git a/test/js/algorithms/sorting/heap-sort.spec.js b/test/js/algorithms/sorting/heap-sort.spec.js new file mode 100644 index 00000000..ae3816dc --- /dev/null +++ b/test/js/algorithms/sorting/heap-sort.spec.js @@ -0,0 +1,4 @@ +import { heapSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(heapSort, 'Heap Sort'); diff --git a/test/js/algorithms/sorting/insertion-sort.spec.js b/test/js/algorithms/sorting/insertion-sort.spec.js new file mode 100644 index 00000000..c28a69de --- /dev/null +++ b/test/js/algorithms/sorting/insertion-sort.spec.js @@ -0,0 +1,4 @@ +import { insertionSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(insertionSort, 'Insertion Sort'); diff --git a/test/js/algorithms/sorting/merge-sort.spec.js b/test/js/algorithms/sorting/merge-sort.spec.js new file mode 100644 index 00000000..5b161785 --- /dev/null +++ b/test/js/algorithms/sorting/merge-sort.spec.js @@ -0,0 +1,4 @@ +import { mergeSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(mergeSort, 'Merge Sort'); diff --git a/test/js/algorithms/sorting/quicksort.spec.js b/test/js/algorithms/sorting/quicksort.spec.js new file mode 100644 index 00000000..0cbe027a --- /dev/null +++ b/test/js/algorithms/sorting/quicksort.spec.js @@ -0,0 +1,4 @@ +import { quickSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(quickSort, 'Quick Sort'); diff --git a/test/js/algorithms/sorting/radix-sort.spec.js b/test/js/algorithms/sorting/radix-sort.spec.js new file mode 100644 index 00000000..af6a5b07 --- /dev/null +++ b/test/js/algorithms/sorting/radix-sort.spec.js @@ -0,0 +1,4 @@ +import { radixSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(radixSort, 'Radix Sort', { reverseCompare: false }); diff --git a/test/js/algorithms/sorting/selection-sort.spec.js b/test/js/algorithms/sorting/selection-sort.spec.js new file mode 100644 index 00000000..3d6cd3cc --- /dev/null +++ b/test/js/algorithms/sorting/selection-sort.spec.js @@ -0,0 +1,4 @@ +import { selectionSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(selectionSort, 'Selection Sort'); diff --git a/test/js/algorithms/sorting/shell-sort.spec.js b/test/js/algorithms/sorting/shell-sort.spec.js new file mode 100644 index 00000000..92aa33a5 --- /dev/null +++ b/test/js/algorithms/sorting/shell-sort.spec.js @@ -0,0 +1,4 @@ +import { shellSort } from '../../../../src/js/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(shellSort, 'Shell Sort'); diff --git a/test/js/algorithms/sorting/sort-algorithm-tests.js b/test/js/algorithms/sorting/sort-algorithm-tests.js new file mode 100644 index 00000000..6b883e83 --- /dev/null +++ b/test/js/algorithms/sorting/sort-algorithm-tests.js @@ -0,0 +1,69 @@ +import 'mocha'; +import { expect } from 'chai'; +import { Compare } from '../../../../src/js/util'; + +export function testSortAlgorithm(sortAlgorithm, algorithmName, config = { reverseCompare: true }) { + describe(algorithmName, () => { + const SIZE = 100; + + function createNonSortedArray() { + const array = []; + for (let i = SIZE; i > 0; i--) { + array.push(i); + } + return array; + } + + function createSortedArray() { + const array = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('works with empty arrays', () => { + expect(sortAlgorithm([])).to.deep.equal([]); + }); + + it('works with sorted arrays', () => { + let array = createSortedArray(); + const sortedArray = createSortedArray(); + array = sortAlgorithm(array); + expect(array).to.deep.equal(sortedArray); + }); + + it('works with non-sorted arrays', () => { + let array = createNonSortedArray(); + const sortedArray = createSortedArray(); + array = sortAlgorithm(array); + + expect(array).to.deep.equal(sortedArray); + + for (let i = 0; i < array.length - 1; i++) { + expect(array[i] <= array[i + 1]).to.equal(true); + } + }); + + function reverseCompare(a, b) { + if (a === b) { + return 0; + } + return a < b ? Compare.BIGGER_THAN : Compare.LESS_THAN; + } + + if (config.reverseCompare) { + it('works with reverse comparator - descending order', () => { + let array = createSortedArray(); + const sortedArray = createNonSortedArray(); + array = sortAlgorithm(array, reverseCompare); + + expect(array).to.deep.equal(sortedArray); + + for (let i = 0; i < array.length - 1; i++) { + expect(array[i] >= array[i + 1]).to.equal(true); + } + }); + } + }); +} diff --git a/test/js/data-structures/avl-tree.spec.js b/test/js/data-structures/avl-tree.spec.js new file mode 100644 index 00000000..f113e561 --- /dev/null +++ b/test/js/data-structures/avl-tree.spec.js @@ -0,0 +1,32 @@ +import 'mocha'; +import { expect } from 'chai'; +import { AVLTree } from '../../../src/js/index'; + +describe('AVLTree', () => { + let tree; + + beforeEach(() => { + tree = new AVLTree(); + }); + + it('starts empty', () => { + expect(tree.getRoot()).to.equal(null); + }); + + it('inserts elements in the AVLTree', () => { + expect(tree.getRoot()).to.equal(null); + + tree.insert(1); + tree.insert(2); + tree.insert(3); + tree.insert(4); + tree.insert(5); + tree.insert(6); + tree.insert(7); + tree.insert(14); + tree.insert(15); + tree.insert(13); + tree.insert(12); + tree.insert(11); + }); +}); diff --git a/test/js/data-structures/binary-search-tree.spec.js b/test/js/data-structures/binary-search-tree.spec.js new file mode 100644 index 00000000..8b940818 --- /dev/null +++ b/test/js/data-structures/binary-search-tree.spec.js @@ -0,0 +1,108 @@ +import 'mocha'; +import { expect } from 'chai'; +import { BinarySearchTree } from '../../../src/js/index'; + +describe('BinarySearchTree', () => { + let tree; + + beforeEach(() => { + tree = new BinarySearchTree(); + }); + + it('starts empty', () => { + expect(tree.getRoot()).to.equal(undefined); + }); + + function assertNode(node, key, left, right) { + if (key != null) { + expect(node.key).to.equal(key); + } else { + expect(node).to.equal(key); + return; + } + + if (left != null) { + expect(node.left.key).to.equal(left); + } else { + expect(node.left).to.equal(left); + } + + if (right != null) { + expect(node.right.key).to.equal(right); + } else { + expect(node.right).to.equal(right); + } + } + + it('inserts elements in the BST', () => { + expect(tree.getRoot()).to.equal(undefined); + + tree.insert(11); + tree.insert(7); + tree.insert(15); + tree.insert(5); + tree.insert(3); + tree.insert(9); + tree.insert(8); + tree.insert(10); + tree.insert(13); + tree.insert(12); + tree.insert(14); + tree.insert(20); + tree.insert(18); + tree.insert(25); + + let node = tree.getRoot(); + assertNode(node, 11, 7, 15); + + node = node.left; + assertNode(node, 7, 5, 9); + + node = node.left; + assertNode(node, 5, 3, undefined); + + node = node.left; + assertNode(node, 3, undefined, undefined); + + node = tree.getRoot().left.left.right; + assertNode(node, undefined, undefined, undefined); + + node = tree.getRoot().left.right; + assertNode(node, 9, 8, 10); + + node = node.left; + assertNode(node, 8, undefined, undefined); + + node = tree.getRoot().left.right.right; + assertNode(node, 10, undefined, undefined); + + node = tree.getRoot().right; + assertNode(node, 15, 13, 20); + + node = node.left; + assertNode(node, 13, 12, 14); + + node = node.left; + assertNode(node, 12, undefined, undefined); + + node = tree.getRoot().right.left.right; + assertNode(node, 14, undefined, undefined); + + node = tree.getRoot().right.right; + assertNode(node, 20, 18, 25); + + node = node.left; + assertNode(node, 18, undefined, undefined); + + node = tree.getRoot().right.right.right; + assertNode(node, 25, undefined, undefined); + }); + + it('verifies if element exists', () => { + expect(tree.getRoot()).to.equal(undefined); + }); + + it('removes a leaf', () => { + expect(tree.getRoot()).to.equal(undefined); + }); +}); diff --git a/test/js/data-structures/circular-linked-list.spec.js b/test/js/data-structures/circular-linked-list.spec.js new file mode 100644 index 00000000..aadb02ee --- /dev/null +++ b/test/js/data-structures/circular-linked-list.spec.js @@ -0,0 +1,342 @@ +import 'mocha'; +import { expect } from 'chai'; +import { CircularLinkedList } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('CircularLinkedList', () => { + let list; + let min; + let max; + + beforeEach(() => { + list = new CircularLinkedList(); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = min; i <= max; i++) { + list.push(i); + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max && current; i++) { + expect(current).to.not.be.an('undefined'); + if (current) { + // TS strictNullChecks + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + // TS strictNullChecks + expect(current.next.element).to.equal(i + 1); + } + } else { + // circular list + expect(current.next).to.not.be.an('undefined'); + expect(current.next).to.equal(list.getHead()); + if (current.next) { + expect(current.next.element).to.equal(min); + } + } + current = current.next; + } + } + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max, 0)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + expect(list.insert(1, 1)).to.equal(false); + }); + + it('inserts elements invalid position not empty list', () => { + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(false); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i, i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + const minIndex = min; + for (let i = minIndex; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + min++; + verifyList(); + } + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(min); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(max); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(max); + expect(current.next).to.not.be.an('undefined'); + expect(current.next).to.equal(list.getHead()); + if (current.next) { + expect(current.next.element).to.equal(min); + } + } + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new CircularLinkedList(); + ds.push('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new CircularLinkedList(); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/js/data-structures/deque.spec.js b/test/js/data-structures/deque.spec.js new file mode 100644 index 00000000..49ab2dfa --- /dev/null +++ b/test/js/data-structures/deque.spec.js @@ -0,0 +1,208 @@ +import 'mocha'; +import { expect } from 'chai'; +import Deque from '../../../src/js/data-structures/deque'; + +describe('Deque', () => { + let deque; + + beforeEach(() => { + deque = new Deque(); + }); + + it('starts empty', () => { + expect(deque.size()).to.equal(0); + expect(deque.isEmpty()).to.equal(true); + }); + + it('add elements in the back', () => { + deque.addBack(1); + expect(deque.size()).to.equal(1); + + deque.addBack(2); + expect(deque.size()).to.equal(2); + + deque.addBack(3); + expect(deque.size()).to.equal(3); + }); + + it('add elements in the front', () => { + deque.addFront(1); + expect(deque.size()).to.equal(1); + + deque.addFront(2); + expect(deque.size()).to.equal(2); + + deque.addFront(3); + expect(deque.size()).to.equal(3); + + deque.removeFront(); + deque.addFront(4); + expect(deque.size()).to.equal(3); + }); + + it('remove elements from the back', () => { + deque.addBack(1); + deque.addBack(2); + deque.addBack(3); + deque.addFront(0); + + expect(deque.removeBack()).to.equal(3); + expect(deque.removeBack()).to.equal(2); + expect(deque.removeBack()).to.equal(1); + expect(deque.removeBack()).to.equal(0); + expect(deque.removeBack()).to.equal(undefined); + }); + + it('remove elements from the front', () => { + deque.addFront(1); + deque.addBack(2); + deque.addBack(3); + deque.addFront(0); + deque.addFront(-1); + deque.addFront(-2); + + expect(deque.removeFront()).to.equal(-2); + expect(deque.removeFront()).to.equal(-1); + expect(deque.removeFront()).to.equal(0); + expect(deque.removeFront()).to.equal(1); + expect(deque.removeFront()).to.equal(2); + expect(deque.removeFront()).to.equal(3); + expect(deque.removeFront()).to.equal(undefined); + }); + + it('allows to peek at the front element in the deque without removing it', () => { + expect(deque.peekFront()).to.equal(undefined); + + deque.addFront(1); + expect(deque.peekFront()).to.equal(1); + deque.addBack(2); + expect(deque.peekFront()).to.equal(1); + deque.addBack(3); + expect(deque.peekFront()).to.equal(1); + deque.addFront(0); + expect(deque.peekFront()).to.equal(0); + deque.addFront(-1); + expect(deque.peekFront()).to.equal(-1); + deque.addFront(-2); + expect(deque.peekFront()).to.equal(-2); + }); + + it('allows to peek at the last element in the deque without removing it', () => { + expect(deque.peekBack()).to.equal(undefined); + + deque.addFront(1); + expect(deque.peekBack()).to.equal(1); + deque.addBack(2); + expect(deque.peekBack()).to.equal(2); + deque.addBack(3); + expect(deque.peekBack()).to.equal(3); + deque.addFront(0); + expect(deque.peekBack()).to.equal(3); + deque.addFront(-1); + expect(deque.peekBack()).to.equal(3); + deque.addFront(-2); + expect(deque.peekBack()).to.equal(3); + }); + + it('returns the correct size', () => { + expect(deque.size()).to.equal(0); + + deque.addFront(1); + expect(deque.size()).to.equal(1); + deque.addBack(2); + expect(deque.size()).to.equal(2); + deque.addBack(3); + expect(deque.size()).to.equal(3); + deque.addFront(0); + expect(deque.size()).to.equal(4); + deque.addFront(-1); + expect(deque.size()).to.equal(5); + deque.addFront(-2); + expect(deque.size()).to.equal(6); + + deque.clear(); + expect(deque.size()).to.equal(0); + + deque.addFront(1); + deque.addBack(2); + expect(deque.size()).to.equal(2); + + deque.removeFront(); + deque.removeBack(); + expect(deque.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(deque.isEmpty()).to.equal(true); + + deque.addFront(1); + expect(deque.isEmpty()).to.equal(false); + deque.addBack(2); + expect(deque.isEmpty()).to.equal(false); + + deque.clear(); + expect(deque.isEmpty()).to.equal(true); + + deque.addFront(1); + deque.addBack(2); + expect(deque.isEmpty()).to.equal(false); + + deque.removeFront(); + expect(deque.isEmpty()).to.equal(false); + deque.removeBack(); + expect(deque.isEmpty()).to.equal(true); + }); + + it('clears the queue', () => { + deque.clear(); + expect(deque.isEmpty()).to.equal(true); + + deque.addFront(1); + deque.addBack(2); + expect(deque.isEmpty()).to.equal(false); + + deque.clear(); + expect(deque.isEmpty()).to.equal(true); + }); + + it('returns toString primitive types', () => { + expect(deque.toString()).to.equal(''); + + deque.addFront(1); + expect(deque.toString()).to.equal('1'); + + deque.addBack(2); + expect(deque.toString()).to.equal('1,2'); + + deque.clear(); + expect(deque.toString()).to.equal(''); + + const queueString = new Deque(); + queueString.addFront('el1'); + expect(queueString.toString()).to.equal('el1'); + + queueString.addBack('el2'); + expect(queueString.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + class MyObj { + constructor(el1, el2) { + this.el1 = el1; + this.el2 = el2; + } + + toString() { + return `${this.el1.toString()}|${this.el2.toString()}`; + } + } + const dequeMyObj = new Deque(); + expect(dequeMyObj.toString()).to.equal(''); + + dequeMyObj.addFront(new MyObj(1, 2)); + expect(dequeMyObj.toString()).to.equal('1|2'); + + dequeMyObj.addBack(new MyObj(3, 4)); + expect(dequeMyObj.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/js/data-structures/dictionary.spec.js b/test/js/data-structures/dictionary.spec.js new file mode 100644 index 00000000..72e78640 --- /dev/null +++ b/test/js/data-structures/dictionary.spec.js @@ -0,0 +1,266 @@ +import 'mocha'; +import { expect } from 'chai'; +import { Dictionary } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('Dictionary', () => { + let dictionary; + beforeEach(() => { + dictionary = new Dictionary(); + }); + it('starts empty', () => { + expect(dictionary.size()).to.equal(0); + expect(dictionary.isEmpty()).to.equal(true); + }); + it('sets undefined and null keys and values', () => { + const dict = new Dictionary(); + expect(dict.set('undefined', undefined)).to.equal(false); + expect(dict.get('undefined')).to.equal(undefined); + expect(dict.set('undefined', 1)).to.equal(true); + expect(dict.get('undefined')).to.equal(1); + expect(dict.set('null', null)).to.equal(false); + expect(dict.get('null')).to.equal(undefined); + expect(dict.set('null', 1)).to.equal(true); + expect(dict.get('null')).to.equal(1); + dict.clear(); + expect(dict.set(undefined, undefined)).to.equal(false); + expect(dict.get(undefined)).to.equal(undefined); + expect(dict.set(undefined, 1)).to.equal(false); + expect(dict.get(undefined)).to.equal(undefined); + expect(dict.set(null, null)).to.equal(false); + expect(dict.get(null)).to.equal(undefined); + expect(dict.set(null, 1)).to.equal(false); + expect(dict.get(null)).to.equal(undefined); + }); + it('sets values with string key', () => { + const dict = new Dictionary(); + const min = 1; + const max = 5; + const size = (max - min) + 1; + for (let i = min; i <= max; i++) { + expect(dict.set(`${i}`, i)).to.equal(true); + } + expect(dict.size()).to.equal(size); + const keys = dict.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal((i + 1).toString(10)); + } + dict.set('a', 1); + expect(dict.get('a')).to.equal(1); + }); + it('sets values with number key', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + const keys = dictionary.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal(i + 1); + } + }); + it('sets values with object', () => { + const dict = new Dictionary(); + const min = 0; + const max = 5; + const size = max - min; + const myObjList = []; + for (let i = min; i < max; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + for (let i = min; i < max; i++) { + expect(dict.set(myObjList[i], myObjList[i])).to.equal(true); + } + expect(dict.size()).to.equal(size); + for (let i = min; i < max; i++) { + expect(dict.get(myObjList[i])).to.equal(myObjList[i]); + } + const keys = dict.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal(myObjList[i]); + } + const values = dict.values(); + expect(values.length).to.equal(size); + for (let i = 0; i < values.length; i++) { + expect(values[i]).to.equal(myObjList[i]); + } + }); + function customToString(key) { + return `####${key.toString()}`; + } + it('sets values with custom toString function', () => { + const dict = new Dictionary(customToString); + const min = 0; + const max = 5; + const size = max - min; + const myObjList = []; + for (let i = min; i < max; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + for (let i = min; i < max; i++) { + expect(dict.set(myObjList[i], myObjList[i])).to.equal(true); + } + expect(dict.size()).to.equal(size); + for (let i = min; i < max; i++) { + expect(dict.get(myObjList[i])).to.equal(myObjList[i]); + } + const keys = dict.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal(myObjList[i]); + } + const values = dict.values(); + expect(values.length).to.equal(size); + for (let i = 0; i < values.length; i++) { + expect(values[i]).to.equal(myObjList[i]); + } + }); + it('removes elements', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(dictionary.remove(i)).to.equal(true); + } + // elements do not exist + for (let i = min; i <= max; i++) { + expect(dictionary.remove(i)).to.equal(false); + } + expect(dictionary.isEmpty()).to.equal(true); + }); + it('returns the correct size', () => { + expect(dictionary.size()).to.equal(0); + const max = 5; + for (let i = 1; i < max; i++) { + dictionary.set(i, i); + expect(dictionary.size()).to.equal(i); + } + for (let i = 1; i < max; i++) { + dictionary.remove(i); + expect(dictionary.size()).to.equal(max - i - 1); + } + expect(dictionary.size()).to.equal(0); + expect(dictionary.isEmpty()).to.equal(true); + }); + it('returns if element exists', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(dictionary.hasKey(i)).to.equal(true); + expect(dictionary.remove(i)).to.equal(true); + expect(dictionary.hasKey(i)).to.equal(false); + } + }); + it('returns if it is empty', () => { + expect(dictionary.isEmpty()).to.equal(true); + for (let i = 1; i < 5; i++) { + dictionary.set(i, i); + expect(dictionary.isEmpty()).to.equal(false); + } + for (let i = 1; i < 5; i++) { + dictionary.remove(i); + expect(dictionary.isEmpty()).to.equal(!(i < 4)); + } + expect(dictionary.size()).to.equal(0); + expect(dictionary.isEmpty()).to.equal(true); + }); + it('clears the dictionary', () => { + dictionary.clear(); + expect(dictionary.isEmpty()).to.equal(true); + dictionary.set(1, 1); + dictionary.set(2, 2); + dictionary.clear(); + expect(dictionary.isEmpty()).to.equal(true); + }); + it('returns values, keys and value pairs', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + const keys = dictionary.keys(); + const values = dictionary.values(); + const valuePairs = dictionary.keyValues(); + expect(keys.length).to.equal(size); + expect(values.length).to.equal(size); + expect(valuePairs.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal(i + 1); + expect(values[i]).to.equal(i + 1); + expect(valuePairs[i].key).to.equal(i + 1); + expect(valuePairs[i].value).to.equal(i + 1); + } + }); + it('allows to iterate with forEach', () => { + for (let i = 1; i <= 5; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + dictionary.forEach((k, v) => { + expect(dictionary.hasKey(k)).to.equal(true); + expect(dictionary.get(k)).to.equal(v); + }); + }); + it('allows to iterate with forEach and interrupt', () => { + for (let i = 1; i <= 5; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + const size = dictionary.keys().length; + let index = 1; + dictionary.forEach((k, v) => { + expect(dictionary.hasKey(k)).to.equal(true); + expect(dictionary.get(k)).to.equal(v); + index++; + }); + expect(index).to.equal(size + 1); + index = 1; + dictionary.forEach((k, v) => { + expect(dictionary.hasKey(k)).to.equal(true); + expect(dictionary.get(k)).to.equal(v); + index++; + return !(k % 3 === 0); + }); + expect(index).to.equal(size - 1); + }); + it('returns toString primitive types', () => { + expect(dictionary.toString()).to.equal(''); + dictionary.set(1, 1); + expect(dictionary.toString()).to.equal('[#1: 1]'); + dictionary.set(2, 2); + expect(dictionary.toString()).to.equal('[#1: 1],[#2: 2]'); + dictionary.clear(); + expect(dictionary.toString()).to.equal(''); + }); + it('returns toString primitive types: string', () => { + const dict = new Dictionary(); + dict.set('el1', 1); + expect(dict.toString()).to.equal('[#el1: 1]'); + dict.set('el2', 2); + expect(dict.toString()).to.equal('[#el1: 1],[#el2: 2]'); + }); + it('returns toString objects', () => { + const dict = new Dictionary(); + expect(dict.toString()).to.equal(''); + let myObj = new MyObj(1, 2); + dict.set(myObj, myObj); + expect(dict.toString()).to.equal('[#1|2: 1|2]'); + myObj = new MyObj(3, 4); + dict.set(myObj, myObj); + expect(dict.toString()).to.equal('[#1|2: 1|2],[#3|4: 3|4]'); + }); +}); diff --git a/test/js/data-structures/doubly-linked-list.spec.js b/test/js/data-structures/doubly-linked-list.spec.js new file mode 100644 index 00000000..5e7fd6a4 --- /dev/null +++ b/test/js/data-structures/doubly-linked-list.spec.js @@ -0,0 +1,406 @@ +import 'mocha'; +import { expect } from 'chai'; +import { DoublyLinkedList } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('DoublyLinkedList', () => { + let list; + let min; + let max; + + beforeEach(() => { + list = new DoublyLinkedList(); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = min; i <= max; i++) { + list.push(i); + } + } + + function verifyNode(current, i) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + + // verify next node + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + // TS strictNullChecks + if (current.next) { + expect(current.next.element).to.equal(i + 1); + } + } else { + expect(current.next).to.be.an('undefined'); + } + + // verify previous node + if (i > min) { + expect(current.prev).to.not.be.an('undefined'); + if (current.prev) { + expect(current.prev.element).to.equal(i - 1); + } + } else { + expect(current.prev).to.be.an('undefined'); + } + } + + function verifyListFromTail() { + let current = list.getTail(); + for (let i = max; i >= min; i--) { + expect(current).to.not.be.an('undefined'); + // TS strictNullChecks + if (current) { + verifyNode(current, i); + current = current.prev; + } + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max; i++) { + expect(current).to.not.be.an('undefined'); + // TS strictNullChecks + if (current) { + verifyNode(current, i); + current = current.next; + } + } + verifyListFromTail(); + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + expect(list.getTail()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max, 0)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + expect(list.insert(1, 1)).to.equal(false); + }); + + it('inserts elements invalid position not empty list', () => { + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(false); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i, i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + for (let i = min; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.getTail()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(1); + expect(current.prev).to.be.an('undefined'); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(3); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(3); + expect(current.next).to.be.an('undefined'); + expect(current.prev).to.not.be.an('undefined'); + if (current.prev) { + expect(current.prev.element).to.equal(1); + } + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the tail of the list', () => { + expect(list.getTail()).to.be.an('undefined'); + + list.push(1); + expect(list.getTail()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new DoublyLinkedList(); + ds.push('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new DoublyLinkedList(); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); + + it('returns inverseToString primitive types', () => { + expect(list.inverseToString()).to.equal(''); + + list.push(1); + expect(list.inverseToString()).to.equal('1'); + + list.push(2); + expect(list.inverseToString()).to.equal('2,1'); + + list.clear(); + expect(list.inverseToString()).to.equal(''); + }); + + it('returns inverseToString primitive types: string', () => { + const ds = new DoublyLinkedList(); + ds.push('el1'); + expect(ds.inverseToString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.inverseToString()).to.equal('el2,el1'); + }); + + it('returns inverseToString objects', () => { + const ds = new DoublyLinkedList(); + expect(ds.inverseToString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.inverseToString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.inverseToString()).to.equal('3|4,1|2'); + }); +}); diff --git a/test/js/data-structures/hash-table-linear-probing-lazy.spec.js b/test/js/data-structures/hash-table-linear-probing-lazy.spec.js new file mode 100644 index 00000000..f7dd7e06 --- /dev/null +++ b/test/js/data-structures/hash-table-linear-probing-lazy.spec.js @@ -0,0 +1,300 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTableLinearProbingLazy } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('HashTableLinearProbingLazy', () => { + const A = 'Jonathan'; + const B = 'Jamie'; + const C = 'Sue'; + it('starts empty', () => { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + it('generates hashcode', () => { + // numbers + let hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + // strings + hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + // objects + hashTable = new HashTableLinearProbingLazy(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + it('puts undefined and null keys and values', () => { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + it('puts values with number key without collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableLinearProbingLazy(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + } + }); + it('puts values with string key without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + const table = hashTable.getTable(); + expect(table[12].key).to.equal('1'); + expect(table[12].value).to.equal(1); + expect(table[23].key).to.equal('10'); + expect(table[23].value).to.equal(10); + expect(table[34].key).to.equal('100'); + expect(table[34].value).to.equal(100); + expect(table[8].key).to.equal('1000'); + expect(table[8].value).to.equal(1000); + }); + it('puts values with object key without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + const table = hashTable.getTable(); + expect(table[1].key).to.equal(myObjList[0]); + expect(table[1].value).to.equal(myObjList[0]); + expect(table[3].key).to.equal(myObjList[1]); + expect(table[3].value).to.equal(myObjList[1]); + expect(table[5].key).to.equal(myObjList[2]); + expect(table[5].value).to.equal(myObjList[2]); + expect(table[7].key).to.equal(myObjList[3]); + expect(table[7].value).to.equal(myObjList[3]); + expect(table[9].key).to.equal(myObjList[4]); + expect(table[9].value).to.equal(myObjList[4]); + }); + function addValuesCollision() { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.size()).to.equal(3); + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + expect(hashTable.size()).to.equal(3); + return hashTable; + } + it('puts values with collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableLinearProbingLazy(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 10)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 2); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 100)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 3); + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + expect(table[i + size].key).to.equal(i); + expect(table[i + size].value).to.equal(i + 10); + expect(table[i + (size * 2)].key).to.equal(i); + expect(table[i + (size * 2)].value).to.equal(i + 100); + } + addValuesCollision(); + }); + it('removes elements without collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableLinearProbingLazy(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + expect(hashTable.isEmpty()).to.equal(true); + }); + function removeWithCollision(a, b, c) { + const hashTable = addValuesCollision(); + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + expect(hashTable.isEmpty()).to.equal(true); + } + it('removes elements with collisions: scenario 1', () => { + // test all possibilities for removal + removeWithCollision(A, B, C); + removeWithCollision(A, C, B); + removeWithCollision(B, A, C); + removeWithCollision(B, C, A); + removeWithCollision(C, A, B); + removeWithCollision(C, B, A); + }); + function addValuesCollision2() { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.put(')', 'parenthesis@email.com')).to.equal(true); + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put('+', 'plus@email.com')).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(',', 'comma@email.com')).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.put('-', 'minus@email.com')).to.equal(true); + expect(hashTable.put('0', 'zero@email.com')).to.equal(true); + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + expect(hashTable.hashCode(')')).to.equal(4); + expect(hashTable.hashCode('+')).to.equal(6); + expect(hashTable.hashCode(',')).to.equal(7); + expect(hashTable.hashCode('-')).to.equal(8); + expect(hashTable.hashCode('0')).to.equal(11); + expect(hashTable.size()).to.equal(8); + const table = hashTable.getTable(); + expect(table[4].key).to.equal(')'); + expect(table[5].key).to.equal(A); + expect(table[6].key).to.equal('+'); + expect(table[7].key).to.equal(B); + expect(table[8].key).to.equal(','); + expect(table[9].key).to.equal(C); + expect(table[10].key).to.equal('-'); + expect(table[11].key).to.equal('0'); + return hashTable; + } + function verifyOtherKeys(hashTable) { + expect(hashTable.get(')')).to.not.equal(undefined); + expect(hashTable.get('+')).to.not.equal(undefined); + expect(hashTable.get(',')).to.not.equal(undefined); + expect(hashTable.get('-')).to.not.equal(undefined); + expect(hashTable.get('0')).to.not.equal(undefined); + } + function removeWithCollision2(a, b, c) { + const hashTable = addValuesCollision2(); + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + verifyOtherKeys(hashTable); + } + it('removes elements with collisions: scenario 2', () => { + // test all possibilities for removal + removeWithCollision2(A, B, C); + removeWithCollision2(A, C, B); + removeWithCollision2(B, A, C); + removeWithCollision2(B, C, A); + removeWithCollision2(C, A, B); + removeWithCollision2(C, B, A); + }); + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.toString()).to.equal(''); + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + it('returns toString objects without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}'); + }); + it('returns toString with collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.toString()).to.equal(''); + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + hashTable.put(1, 10); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]},{3 => [#1: 10]}'); + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); +}); diff --git a/test/js/data-structures/hash-table-linear-probing.spec.js b/test/js/data-structures/hash-table-linear-probing.spec.js new file mode 100644 index 00000000..bfb519f3 --- /dev/null +++ b/test/js/data-structures/hash-table-linear-probing.spec.js @@ -0,0 +1,300 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTableLinearProbing } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('HashTableLinearProbing', () => { + const A = 'Jonathan'; + const B = 'Jamie'; + const C = 'Sue'; + it('starts empty', () => { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + it('generates hashcode', () => { + // numbers + let hashTable = new HashTableLinearProbing(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + // strings + hashTable = new HashTableLinearProbing(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + // objects + hashTable = new HashTableLinearProbing(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + it('puts undefined and null keys and values', () => { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + it('puts values with number key without collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableLinearProbing(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + } + }); + it('puts values with string key without collisions', () => { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + const table = hashTable.getTable(); + expect(table[12].key).to.equal('1'); + expect(table[12].value).to.equal(1); + expect(table[23].key).to.equal('10'); + expect(table[23].value).to.equal(10); + expect(table[34].key).to.equal('100'); + expect(table[34].value).to.equal(100); + expect(table[8].key).to.equal('1000'); + expect(table[8].value).to.equal(1000); + }); + it('puts values with object key without collisions', () => { + const hashTable = new HashTableLinearProbing(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + const table = hashTable.getTable(); + expect(table[1].key).to.equal(myObjList[0]); + expect(table[1].value).to.equal(myObjList[0]); + expect(table[3].key).to.equal(myObjList[1]); + expect(table[3].value).to.equal(myObjList[1]); + expect(table[5].key).to.equal(myObjList[2]); + expect(table[5].value).to.equal(myObjList[2]); + expect(table[7].key).to.equal(myObjList[3]); + expect(table[7].value).to.equal(myObjList[3]); + expect(table[9].key).to.equal(myObjList[4]); + expect(table[9].value).to.equal(myObjList[4]); + }); + function addValuesCollision() { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.size()).to.equal(3); + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + expect(hashTable.size()).to.equal(3); + return hashTable; + } + it('puts values with collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableLinearProbing(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 10)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 2); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 100)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 3); + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + expect(table[i + size].key).to.equal(i); + expect(table[i + size].value).to.equal(i + 10); + expect(table[i + (size * 2)].key).to.equal(i); + expect(table[i + (size * 2)].value).to.equal(i + 100); + } + addValuesCollision(); + }); + it('removes elements without collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableLinearProbing(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + expect(hashTable.isEmpty()).to.equal(true); + }); + function removeWithCollision(a, b, c) { + const hashTable = addValuesCollision(); + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + expect(hashTable.isEmpty()).to.equal(true); + } + it('removes elements with collisions: scenario 1', () => { + // test all possibilities for removal + removeWithCollision(A, B, C); + removeWithCollision(A, C, B); + removeWithCollision(B, A, C); + removeWithCollision(B, C, A); + removeWithCollision(C, A, B); + removeWithCollision(C, B, A); + }); + function addValuesCollision2() { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.put(')', 'parenthesis@email.com')).to.equal(true); + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put('+', 'plus@email.com')).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(',', 'comma@email.com')).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.put('-', 'minus@email.com')).to.equal(true); + expect(hashTable.put('0', 'zero@email.com')).to.equal(true); + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + expect(hashTable.hashCode(')')).to.equal(4); + expect(hashTable.hashCode('+')).to.equal(6); + expect(hashTable.hashCode(',')).to.equal(7); + expect(hashTable.hashCode('-')).to.equal(8); + expect(hashTable.hashCode('0')).to.equal(11); + expect(hashTable.size()).to.equal(8); + const table = hashTable.getTable(); + expect(table[4].key).to.equal(')'); + expect(table[5].key).to.equal(A); + expect(table[6].key).to.equal('+'); + expect(table[7].key).to.equal(B); + expect(table[8].key).to.equal(','); + expect(table[9].key).to.equal(C); + expect(table[10].key).to.equal('-'); + expect(table[11].key).to.equal('0'); + return hashTable; + } + function verifyOtherKeys(hashTable) { + expect(hashTable.get(')')).to.not.equal(undefined); + expect(hashTable.get('+')).to.not.equal(undefined); + expect(hashTable.get(',')).to.not.equal(undefined); + expect(hashTable.get('-')).to.not.equal(undefined); + expect(hashTable.get('0')).to.not.equal(undefined); + } + function removeWithCollision2(a, b, c) { + const hashTable = addValuesCollision2(); + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + verifyOtherKeys(hashTable); + } + it('removes elements with collisions: scenario 2', () => { + // test all possibilities for removal + removeWithCollision2(A, B, C); + removeWithCollision2(A, C, B); + removeWithCollision2(B, A, C); + removeWithCollision2(B, C, A); + removeWithCollision2(C, A, B); + removeWithCollision2(C, B, A); + }); + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.toString()).to.equal(''); + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbing(); + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + it('returns toString objects without collisions', () => { + const hashTable = new HashTableLinearProbing(); + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}'); + }); + it('returns toString with collisions', () => { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.toString()).to.equal(''); + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + hashTable.put(1, 10); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]},{3 => [#1: 10]}'); + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); +}); diff --git a/test/js/data-structures/hash-table-separate-chaining.spec.js b/test/js/data-structures/hash-table-separate-chaining.spec.js new file mode 100644 index 00000000..2066c2d0 --- /dev/null +++ b/test/js/data-structures/hash-table-separate-chaining.spec.js @@ -0,0 +1,269 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTableSeparateChaining } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('HashTableSeparateChaining', () => { + const A = 'Jonathan'; + const B = 'Jamie'; + const C = 'Sue'; + it('starts empty', () => { + const hashTable = new HashTableSeparateChaining(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + it('generates hashcode', () => { + // numbers + let hashTable = new HashTableSeparateChaining(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + // strings + hashTable = new HashTableSeparateChaining(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + // objects + hashTable = new HashTableSeparateChaining(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + it('puts undefined and null keys and values', () => { + const hashTable = new HashTableSeparateChaining(); + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + it('puts values with number key without collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableSeparateChaining(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + const linkedList = table[i]; + expect(linkedList.size()).to.equal(1); + const valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i); + } + }); + it('puts values with string key without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + const table = hashTable.getTable(); + let linkedList = table[12]; + expect(linkedList.size()).to.equal(1); + let valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('1'); + expect(valuePair.element.value).to.equal(1); + linkedList = table[23]; // eslint-disable-line prefer-destructuring + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('10'); + expect(valuePair.element.value).to.equal(10); + linkedList = table[34]; // eslint-disable-line prefer-destructuring + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('100'); + expect(valuePair.element.value).to.equal(100); + linkedList = table[8]; // eslint-disable-line prefer-destructuring + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('1000'); + expect(valuePair.element.value).to.equal(1000); + }); + it('puts values with object key without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + const table = hashTable.getTable(); + let linkedList = table[1]; + expect(linkedList.size()).to.equal(1); + let valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[0]); + expect(valuePair.element.value).to.equal(myObjList[0]); + linkedList = table[3]; // eslint-disable-line prefer-destructuring + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[1]); + expect(valuePair.element.value).to.equal(myObjList[1]); + linkedList = table[5]; // eslint-disable-line prefer-destructuring + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[2]); + expect(valuePair.element.value).to.equal(myObjList[2]); + linkedList = table[7]; // eslint-disable-line prefer-destructuring + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[3]); + expect(valuePair.element.value).to.equal(myObjList[3]); + linkedList = table[9]; // eslint-disable-line prefer-destructuring + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[4]); + expect(valuePair.element.value).to.equal(myObjList[4]); + }); + it('puts values with collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableSeparateChaining(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 10)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 2); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 100)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 3); + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + const linkedList = table[i]; + expect(linkedList.size()).to.equal(3); + let valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i); + valuePair = valuePair.next; + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i + 10); + valuePair = valuePair.next; + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i + 100); + } + }); + it('removes elements without collisions', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTableSeparateChaining(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + expect(hashTable.isEmpty()).to.equal(true); + }); + function addValuesCollision() { + const hashTable = new HashTableSeparateChaining(); + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.size()).to.equal(3); + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + expect(hashTable.getTable()[expectedHash].size()).to.equal(3); + return hashTable; + } + function removeWithCollision(a, b, c) { + const hashTable = addValuesCollision(); + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + expect(hashTable.isEmpty()).to.equal(true); + } + it('removes elements with collisions', () => { + // test all possibilities for removal + removeWithCollision(A, B, C); + removeWithCollision(A, C, B); + removeWithCollision(B, A, C); + removeWithCollision(B, C, A); + removeWithCollision(C, A, B); + removeWithCollision(C, B, A); + }); + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + expect(hashTable.toString()).to.equal(''); + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + it('returns toString objects without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}'); + }); + it('returns toString with collisions', () => { + const hashTable = new HashTableSeparateChaining(); + expect(hashTable.toString()).to.equal(''); + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + hashTable.put(1, 10); + expect(hashTable.toString()).to.equal('{1 => [#1: 1],[#1: 10]},{2 => [#2: 2]}'); + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); +}); diff --git a/test/js/data-structures/hash-table.spec.js b/test/js/data-structures/hash-table.spec.js new file mode 100644 index 00000000..862c9be0 --- /dev/null +++ b/test/js/data-structures/hash-table.spec.js @@ -0,0 +1,161 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTable } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('HashTable', () => { + it('starts empty', () => { + const hashTable = new HashTable(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + it('generates hashcode', () => { + // numbers + let hashTable = new HashTable(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + // strings + hashTable = new HashTable(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + // objects + hashTable = new HashTable(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + it('puts undefined and null keys and values', () => { + const hashTable = new HashTable(); + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + it('puts values with number key', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTable(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + } + }); + it('puts values with string key', () => { + const hashTable = new HashTable(); + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + const table = hashTable.getTable(); + expect(table[12].key).to.equal('1'); + expect(table[12].value).to.equal(1); + expect(table[23].key).to.equal('10'); + expect(table[23].value).to.equal(10); + expect(table[34].key).to.equal('100'); + expect(table[34].value).to.equal(100); + expect(table[8].key).to.equal('1000'); + expect(table[8].value).to.equal(1000); + }); + it('puts values with object key', () => { + const hashTable = new HashTable(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + const table = hashTable.getTable(); + expect(table[1].key).to.equal(myObjList[0]); + expect(table[1].value).to.equal(myObjList[0]); + expect(table[3].key).to.equal(myObjList[1]); + expect(table[3].value).to.equal(myObjList[1]); + expect(table[5].key).to.equal(myObjList[2]); + expect(table[5].value).to.equal(myObjList[2]); + expect(table[7].key).to.equal(myObjList[3]); + expect(table[7].value).to.equal(myObjList[3]); + expect(table[9].key).to.equal(myObjList[4]); + expect(table[9].value).to.equal(myObjList[4]); + }); + it('does NOT handle collision, replaces values', () => { + const hashTable = new HashTable(); + for (let i = 0; i < 5; i++) { + expect(hashTable.put(1, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(1); + }); + it('removes elements', () => { + const min = 1; + const max = 5; + const size = (max - min) + 1; + const hashTable = new HashTable(); + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + expect(hashTable.isEmpty()).to.equal(true); + }); + it('returns toString primitive types', () => { + const hashTable = new HashTable(); + expect(hashTable.toString()).to.equal(''); + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + it('returns toString primitive types', () => { + const hashTable = new HashTable(); + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + it('returns toString objects', () => { + const hashTable = new HashTable(); + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}'); + }); +}); diff --git a/test/js/data-structures/heap.spec.js b/test/js/data-structures/heap.spec.js new file mode 100644 index 00000000..15ce1bce --- /dev/null +++ b/test/js/data-structures/heap.spec.js @@ -0,0 +1,75 @@ +import 'mocha'; +import { expect } from 'chai'; +import { MinHeap, heapSort } from '../../../src/js/index'; + +describe('Heap', () => { + let heap; + + beforeEach(() => { + heap = new MinHeap(); + }); + + it('starts empty MinHeap', () => { + expect(heap.size()).to.equal(0); + expect(heap.isEmpty()).to.equal(true); + }); + + it('inserts values in the MinHeap', () => { + const resultArray = []; + for (let i = 1; i < 10; i++) { + resultArray.push(i); + heap.insert(i); + expect(heap.getAsArray()).to.deep.equal(resultArray); + } + }); + + it('finds the min value from the MinHeap', () => { + const resultArray = []; + for (let i = 10; i >= 1; i--) { + resultArray.push(i); + heap.insert(i); + expect(heap.findMinimum()).to.equal(i); + } + }); + + it('performs heapify in the MinHeap', () => { + const resultArray = []; + for (let i = 10; i >= 1; i--) { + resultArray.push(i); + } + expect(heap.heapify(resultArray)).to.deep.equal(resultArray); + }); + + it('extracts the min value from the MinHeap', () => { + let resultArray = []; + for (let i = 1; i < 10; i++) { + resultArray.push(i); + heap.insert(i); + expect(heap.getAsArray()).to.deep.equal(resultArray); + } + + resultArray = [ + [], + [2, 4, 3, 8, 5, 6, 7, 9], + [3, 4, 6, 8, 5, 9, 7], + [4, 5, 6, 8, 7, 9], + [5, 7, 6, 8, 9], + [6, 7, 9, 8], + [7, 8, 9], + [8, 9], + [9], + [] + ]; + + for (let i = 1; i < 10; i++) { + expect(heap.extract()).to.equal(i); + expect(heap.getAsArray()).to.deep.equal(resultArray[i]); + } + }); + + it('Heap Sort', () => { + const array = [3, 2, 5, 6, 1, 7, 8, 9]; + + expect(heapSort(array)).to.deep.equal([1, 2, 3, 5, 6, 7, 8, 9]); + }); +}); diff --git a/test/js/data-structures/linked-list.spec.js b/test/js/data-structures/linked-list.spec.js new file mode 100644 index 00000000..4d9f19c6 --- /dev/null +++ b/test/js/data-structures/linked-list.spec.js @@ -0,0 +1,330 @@ +import 'mocha'; +import { expect } from 'chai'; +import { LinkedList, util } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('LinkedList', () => { + let list; + let min; + let max; + + beforeEach(() => { + list = new LinkedList(util.defaultEquals); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = min; i <= max; i++) { + list.push(i); + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max && current; i++) { + expect(current).to.not.be.an('undefined'); + if (current) { + // TS strictNullChecks + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + // TS strictNullChecks + expect(current.next.element).to.equal(i + 1); + } + } else { + expect(current.next).to.be.an('undefined'); + } + current = current.next; + } + } + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max, 0)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + expect(list.insert(1, 1)).to.equal(false); + }); + + it('inserts elements invalid position not empty list', () => { + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(false); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i, i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + for (let i = min; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + } + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(1); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(3); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(3); + expect(current.next).to.be.an('undefined'); + } + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new LinkedList(); + ds.push('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new LinkedList(); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/js/data-structures/my-obj.js b/test/js/data-structures/my-obj.js new file mode 100644 index 00000000..ed407894 --- /dev/null +++ b/test/js/data-structures/my-obj.js @@ -0,0 +1,10 @@ +export default class MyObj { + constructor(el1, el2) { + this.el1 = el1; + this.el2 = el2; + } + + toString() { + return `${this.el1.toString()}|${this.el2.toString()}`; + } +} diff --git a/test/js/data-structures/queue.spec.js b/test/js/data-structures/queue.spec.js new file mode 100644 index 00000000..84587bc1 --- /dev/null +++ b/test/js/data-structures/queue.spec.js @@ -0,0 +1,172 @@ +import 'mocha'; +import { expect } from 'chai'; +import Queue from '../../../src/js/data-structures/queue'; + +describe('Queue', () => { + let queue; + + beforeEach(() => { + queue = new Queue(); + }); + + it('starts empty', () => { + expect(queue.size()).to.equal(0); + expect(queue.isEmpty()).to.equal(true); + }); + + it('enqueues elements', () => { + queue.enqueue(1); + expect(queue.size()).to.equal(1); + queue.enqueue(2); + expect(queue.size()).to.equal(2); + queue.enqueue(3); + expect(queue.size()).to.equal(3); + + expect(queue.isEmpty()).to.equal(false); + }); + + it('dequeue elements', () => { + queue.enqueue(1); + queue.enqueue(2); + queue.enqueue(3); + + expect(queue.dequeue()).to.equal(1); + expect(queue.dequeue()).to.equal(2); + expect(queue.dequeue()).to.equal(3); + expect(queue.dequeue()).to.equal(undefined); + }); + + it('implements FIFO logic', () => { + queue.enqueue(1); + expect(queue.peek()).to.equal(1); + queue.enqueue(2); + expect(queue.peek()).to.equal(1); + queue.enqueue(3); + expect(queue.peek()).to.equal(1); + + expect(queue.dequeue()).to.equal(1); + expect(queue.dequeue()).to.equal(2); + expect(queue.dequeue()).to.equal(3); + expect(queue.dequeue()).to.equal(undefined); + }); + + it('allows to peek at the front element in the queue without dequeuing it', () => { + expect(queue.peek()).to.equal(undefined); + + queue.enqueue(1); + expect(queue.peek()).to.equal(1); + + queue.enqueue(2); + expect(queue.peek()).to.equal(1); + + queue.dequeue(); + expect(queue.peek()).to.equal(2); + }); + + it('returns the correct size', () => { + expect(queue.size()).to.equal(0); + queue.enqueue(1); + expect(queue.size()).to.equal(1); + queue.enqueue(2); + expect(queue.size()).to.equal(2); + queue.enqueue(3); + expect(queue.size()).to.equal(3); + + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + + queue.enqueue(1); + queue.enqueue(2); + queue.enqueue(3); + expect(queue.size()).to.equal(3); + + queue.dequeue(); + expect(queue.size()).to.equal(2); + queue.dequeue(); + expect(queue.size()).to.equal(1); + queue.dequeue(); + expect(queue.size()).to.equal(0); + queue.dequeue(); + expect(queue.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(queue.isEmpty()).to.equal(true); + queue.enqueue(1); + expect(queue.isEmpty()).to.equal(false); + queue.enqueue(2); + expect(queue.isEmpty()).to.equal(false); + queue.enqueue(3); + expect(queue.isEmpty()).to.equal(false); + + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + + queue.enqueue(1); + queue.enqueue(2); + queue.enqueue(3); + expect(queue.isEmpty()).to.equal(false); + + queue.dequeue(); + expect(queue.isEmpty()).to.equal(false); + queue.dequeue(); + expect(queue.isEmpty()).to.equal(false); + queue.dequeue(); + expect(queue.isEmpty()).to.equal(true); + queue.dequeue(); + expect(queue.isEmpty()).to.equal(true); + }); + + it('clears the queue', () => { + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + + queue.enqueue(1); + queue.enqueue(2); + expect(queue.isEmpty()).to.equal(false); + + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + }); + + it('returns toString primitive types', () => { + expect(queue.toString()).to.equal(''); + + queue.enqueue(1); + expect(queue.toString()).to.equal('1'); + + queue.enqueue(2); + expect(queue.toString()).to.equal('1,2'); + + queue.clear(); + expect(queue.toString()).to.equal(''); + + const queueString = new Queue(); + queueString.enqueue('el1'); + expect(queueString.toString()).to.equal('el1'); + + queueString.enqueue('el2'); + expect(queueString.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + class MyObj { + constructor(el1, el2) { + this.el1 = el1; + this.el2 = el2; + } + + toString() { + return `${this.el1.toString()}|${this.el2.toString()}`; + } + } + const queueMyObj = new Queue(); + expect(queueMyObj.toString()).to.equal(''); + + queueMyObj.enqueue(new MyObj(1, 2)); + expect(queueMyObj.toString()).to.equal('1|2'); + + queueMyObj.enqueue(new MyObj(3, 4)); + expect(queueMyObj.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/js/data-structures/set.spec.js b/test/js/data-structures/set.spec.js new file mode 100644 index 00000000..f8e2bac1 --- /dev/null +++ b/test/js/data-structures/set.spec.js @@ -0,0 +1,352 @@ +import 'mocha'; +import { expect } from 'chai'; +import { Set } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('Set', () => { + let set; + + beforeEach(() => { + set = new Set(); + }); + + it('starts empty', () => { + expect(set.size()).to.equal(0); + expect(set.isEmpty()).to.equal(true); + }); + + it('adds elements', () => { + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.size()).to.equal(i); + } + + expect(set.isEmpty()).to.equal(false); + }); + + it('does not allow duplicated elements', () => { + let expected = true; + for (let i = 1; i < 5; i++) { + expect(set.add(i)).to.equal(expected); + } + + expected = false; + for (let i = 1; i < 5; i++) { + expect(set.add(i)).to.equal(expected); + } + }); + + it('deletes elements', () => { + for (let i = 1; i < 5; i++) { + set.add(i); + } + + for (let i = 1; i < 5; i++) { + expect(set.delete(i)).to.equal(true); + } + + // elements do not exist + for (let i = 1; i < 5; i++) { + expect(set.delete(i)).to.equal(false); + } + + expect(set.isEmpty()).to.equal(true); + }); + + it('returns if element exists', () => { + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.has(i)).to.equal(true); + } + + for (let i = 1; i < 5; i++) { + expect(set.delete(i)).to.equal(true); + expect(set.has(i)).to.equal(false); + } + }); + + it('returns the correct size', () => { + expect(set.size()).to.equal(0); + + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.size()).to.equal(i); + } + + const max = 5; + for (let i = 1; i < max; i++) { + set.delete(i); + expect(set.size()).to.equal(max - i - 1); + } + + expect(set.size()).to.equal(0); + expect(set.isEmpty()).to.equal(true); + }); + + it('returns if it is empty', () => { + expect(set.isEmpty()).to.equal(true); + + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.isEmpty()).to.equal(false); + } + + for (let i = 1; i < 5; i++) { + set.delete(i); + expect(set.isEmpty()).to.equal(!(i < 4)); + } + + expect(set.size()).to.equal(0); + expect(set.isEmpty()).to.equal(true); + }); + + it('clears the set', () => { + set.clear(); + expect(set.isEmpty()).to.equal(true); + + set.add(1); + set.add(2); + + set.clear(); + expect(set.isEmpty()).to.equal(true); + }); + + function addValues(min, max) { + set = new Set(); + + for (let i = min; i <= max; i++) { + set.add(i); + } + + return set; + } + + it('union between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + let setResult = set1.union(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.union(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('union between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + let setResult = set1.union(set2); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.union(set1); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('union between different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + let setResult = set1.union(set2); + for (let i = 1; i <= 10; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.union(set1); + for (let i = 1; i <= 10; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('union between sets with common values', () => { + const set1 = addValues(1, 5); + const set2 = addValues(3, 6); + + let setResult = set1.union(set2); + for (let i = 1; i <= 6; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.union(set1); + for (let i = 1; i <= 6; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('intersection between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + let setResult = set1.intersection(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.intersection(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('intersection between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + let setResult = set1.intersection(set2); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.intersection(set1); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('intersection different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + let setResult = set1.intersection(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.intersection(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('intersection between sets with common values', () => { + const set1 = addValues(1, 5); + const set2 = addValues(3, 6); + + let setResult = set1.intersection(set2); + for (let i = 3; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.intersection(set1); + for (let i = 3; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('difference between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + let setResult = set1.difference(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.difference(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('difference between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + let setResult = set1.difference(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.difference(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('difference different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + let setResult = set1.difference(set2); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.difference(set1); + for (let i = 6; i <= 10; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('difference between sets with common values', () => { + const set1 = addValues(1, 5); + const set2 = addValues(3, 6); + + let setResult = set1.difference(set2); + for (let i = 1; i <= 2; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.difference(set1); + for (let i = 6; i <= 6; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('isSubsetOf between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + expect(set1.isSubsetOf(set2)).to.equal(true); + expect(set2.isSubsetOf(set1)).to.equal(true); + }); + + it('isSubsetOf between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + expect(set1.isSubsetOf(set2)).to.equal(true); + expect(set2.isSubsetOf(set1)).to.equal(true); + }); + + it('isSubsetOf different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + expect(set1.isSubsetOf(set2)).to.equal(false); + expect(set2.isSubsetOf(set1)).to.equal(false); + }); + + it('isSubsetOf between sets with common values', () => { + const set1 = addValues(1, 8); + const set2 = addValues(3, 6); + expect(set1.isSubsetOf(set2)).to.equal(false); + expect(set2.isSubsetOf(set1)).to.equal(true); + + const set3 = addValues(1, 5); + const set4 = addValues(3, 6); + expect(set3.isSubsetOf(set4)).to.equal(false); + expect(set4.isSubsetOf(set3)).to.equal(false); + }); + + it('returns toString primitive types', () => { + expect(set.toString()).to.equal(''); + + set.add(1); + expect(set.toString()).to.equal('1'); + + set.add(2); + expect(set.toString()).to.equal('1,2'); + + set.clear(); + expect(set.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new Set(); + ds.add('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.add('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new Set(); + expect(ds.toString()).to.equal(''); + + ds.add(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.add(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/js/data-structures/sorted-linked-list.spec.js b/test/js/data-structures/sorted-linked-list.spec.js new file mode 100644 index 00000000..5ccaaff9 --- /dev/null +++ b/test/js/data-structures/sorted-linked-list.spec.js @@ -0,0 +1,340 @@ +import 'mocha'; +import { expect } from 'chai'; +import { SortedLinkedList, util } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('SortedLinkedList', () => { + let list; + let min; + let max; + + beforeEach(() => { + list = new SortedLinkedList(); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = max; i >= min; i--) { + list.push(i); + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max && current; i++) { + expect(current).to.not.be.an('undefined'); + if (current) { + // TS strictNullChecks + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + // TS strictNullChecks + expect(current.next.element).to.equal(i + 1); + } + } else { + expect(current.next).to.be.an('undefined'); + } + current = current.next; + } + } + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + // sorted list will ignore the index position + expect(list.insert(1, 1)).to.equal(true); + }); + + it('inserts elements invalid position not empty list', () => { + // sorted list will ignore the index position + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(true); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i, i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + for (let i = min; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + } + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(1); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(3); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(3); + expect(current.next).to.be.an('undefined'); + } + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + function stringCompare(a, b) { + return a.localeCompare(b); + } + + it('returns toString primitive types: string', () => { + const ds = new SortedLinkedList(util.defaultEquals, stringCompare); + ds.push('el2'); + expect(ds.toString()).to.equal('el2'); + + ds.push('el1'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + function myObjCompare(a, b) { + return a.toString().localeCompare(b.toString()); + } + + it('returns toString objects', () => { + const ds = new SortedLinkedList(util.defaultEquals, myObjCompare); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('3|4'); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/js/data-structures/stack-array.spec.js b/test/js/data-structures/stack-array.spec.js index 615fca68..0f5912ca 100644 --- a/test/js/data-structures/stack-array.spec.js +++ b/test/js/data-structures/stack-array.spec.js @@ -165,6 +165,7 @@ describe('StackArray', () => { this.el1 = el1; this.el2 = el2; } + toString() { return `${this.el1.toString()}|${this.el2.toString()}`; } diff --git a/test/js/data-structures/stack-linked-list.spec.js b/test/js/data-structures/stack-linked-list.spec.js new file mode 100644 index 00000000..19549713 --- /dev/null +++ b/test/js/data-structures/stack-linked-list.spec.js @@ -0,0 +1,157 @@ +import 'mocha'; +import { expect } from 'chai'; +import { StackLinkedList } from '../../../src/js/index'; +import MyObj from './my-obj'; + +describe('StackLinkedList', () => { + let stack; + + beforeEach(() => { + stack = new StackLinkedList(); + }); + + it('starts empty', () => { + expect(stack.size()).to.equal(0); + expect(stack.isEmpty()).to.equal(true); + }); + + it('pushes elements', () => { + stack.push(1); + expect(stack.size()).to.equal(1); + stack.push(2); + expect(stack.size()).to.equal(2); + stack.push(3); + expect(stack.size()).to.equal(3); + + expect(stack.isEmpty()).to.equal(false); + }); + + it('pops elements', () => { + stack.push(1); + stack.push(2); + stack.push(3); + + expect(stack.pop()).to.equal(3); + expect(stack.pop()).to.equal(2); + expect(stack.pop()).to.equal(1); + expect(stack.pop()).to.equal(undefined); + }); + + it('implements LIFO logic', () => { + stack.push(1); + stack.push(2); + stack.push(3); + + expect(stack.pop()).to.equal(3); + expect(stack.pop()).to.equal(2); + expect(stack.pop()).to.equal(1); + expect(stack.pop()).to.equal(undefined); + }); + + it('allows to peek at the top element in he stack without popping it', () => { + expect(stack.peek()).to.equal(undefined); + + stack.push(1); + expect(stack.peek()).to.equal(1); + + stack.push(2); + expect(stack.peek()).to.equal(2); + + stack.pop(); + expect(stack.peek()).to.equal(1); + }); + + it('returns the correct size', () => { + expect(stack.size()).to.equal(0); + stack.push(1); + expect(stack.size()).to.equal(1); + stack.push(2); + expect(stack.size()).to.equal(2); + stack.push(3); + expect(stack.size()).to.equal(3); + + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + + stack.push(1); + stack.push(2); + stack.push(3); + + stack.pop(); + expect(stack.size()).to.equal(2); + stack.pop(); + expect(stack.size()).to.equal(1); + stack.pop(); + expect(stack.size()).to.equal(0); + stack.pop(); + expect(stack.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(stack.isEmpty()).to.equal(true); + stack.push(1); + expect(stack.isEmpty()).to.equal(false); + stack.push(2); + expect(stack.isEmpty()).to.equal(false); + stack.push(3); + expect(stack.isEmpty()).to.equal(false); + + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + + stack.push(1); + stack.push(2); + stack.push(3); + + stack.pop(); + expect(stack.isEmpty()).to.equal(false); + stack.pop(); + expect(stack.isEmpty()).to.equal(false); + stack.pop(); + expect(stack.isEmpty()).to.equal(true); + stack.pop(); + expect(stack.isEmpty()).to.equal(true); + }); + + it('clears the stack', () => { + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + + stack.push(1); + stack.push(2); + + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + }); + + it('returns toString primitive types', () => { + expect(stack.toString()).to.equal(''); + + stack.push(1); + expect(stack.toString()).to.equal('1'); + + stack.push(2); + expect(stack.toString()).to.equal('1,2'); + + stack.clear(); + expect(stack.toString()).to.equal(''); + + const stackString = new StackLinkedList(); + stackString.push('el1'); + expect(stackString.toString()).to.equal('el1'); + + stackString.push('el2'); + expect(stackString.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const stackMyObj = new StackLinkedList(); + expect(stackMyObj.toString()).to.equal(''); + + stackMyObj.push(new MyObj(1, 2)); + expect(stackMyObj.toString()).to.equal('1|2'); + + stackMyObj.push(new MyObj(3, 4)); + expect(stackMyObj.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/js/data-structures/stack.spec.js b/test/js/data-structures/stack.spec.js index 7c77703b..55361a8a 100644 --- a/test/js/data-structures/stack.spec.js +++ b/test/js/data-structures/stack.spec.js @@ -148,6 +148,7 @@ describe('Stack', () => { this.el1 = el1; this.el2 = el2; } + toString() { return `${this.el1.toString()}|${this.el2.toString()}`; } diff --git a/test/js/others/factorial.spec.js b/test/js/others/factorial.spec.js new file mode 100644 index 00000000..69341a7a --- /dev/null +++ b/test/js/others/factorial.spec.js @@ -0,0 +1,25 @@ +import 'mocha'; +import { expect } from 'chai'; +import { factorialIterative, factorial } from '../../../src/js/others/factorial'; + +describe('Factorial', () => { + it('Iterative Factorial', () => { + expect(factorialIterative(-1)).to.equal(undefined); + expect(factorialIterative(0)).to.equal(1); + expect(factorialIterative(1)).to.equal(1); + expect(factorialIterative(2)).to.equal(2); + expect(factorialIterative(3)).to.equal(6); + expect(factorialIterative(4)).to.equal(24); + expect(factorialIterative(5)).to.equal(120); + }); + + it('Recursive Factorial', () => { + expect(factorial(-1)).to.equal(undefined); + expect(factorial(0)).to.equal(1); + expect(factorial(1)).to.equal(1); + expect(factorial(2)).to.equal(2); + expect(factorial(3)).to.equal(6); + expect(factorial(4)).to.equal(24); + expect(factorial(5)).to.equal(120); + }); +}); diff --git a/test/js/others/fibonacci.spec.js b/test/js/others/fibonacci.spec.js new file mode 100644 index 00000000..5eea4888 --- /dev/null +++ b/test/js/others/fibonacci.spec.js @@ -0,0 +1,36 @@ +import 'mocha'; +import { expect } from 'chai'; +import { + fibonacci, + fibonacciIterative, + fibonacciMemoization +} from '../../../src/js/others/fibonacci'; + +describe('Fibonacci', () => { + it('Fibonacci Recursive', () => { + expect(fibonacci(-1)).to.equal(0); + expect(fibonacci(0)).to.equal(0); + expect(fibonacci(1)).to.equal(1); + expect(fibonacci(2)).to.equal(1); + expect(fibonacci(3)).to.equal(2); + expect(fibonacci(4)).to.equal(3); + }); + + it('Fibonacci Iterative', () => { + expect(fibonacciIterative(-1)).to.equal(0); + expect(fibonacciIterative(0)).to.equal(0); + expect(fibonacciIterative(1)).to.equal(1); + expect(fibonacciIterative(2)).to.equal(1); + expect(fibonacciIterative(3)).to.equal(2); + expect(fibonacciIterative(4)).to.equal(3); + }); + + it('Fibonacci with Memoization', () => { + expect(fibonacciMemoization(-1)).to.equal(0); + expect(fibonacciMemoization(0)).to.equal(0); + expect(fibonacciMemoization(1)).to.equal(1); + expect(fibonacciMemoization(2)).to.equal(1); + expect(fibonacciMemoization(3)).to.equal(2); + expect(fibonacciMemoization(4)).to.equal(3); + }); +}); diff --git a/test/js/others/hot-potato.spec.js b/test/js/others/hot-potato.spec.js new file mode 100644 index 00000000..dfbb2751 --- /dev/null +++ b/test/js/others/hot-potato.spec.js @@ -0,0 +1,14 @@ +import 'mocha'; +import { expect } from 'chai'; +import { hotPotato } from '../../../src/js/others/hot-potato'; + +describe('Hot Potato with Queue', () => { + it('Hot potato game', () => { + const names = ['John', 'Jack', 'Camila', 'Ingrid', 'Carl']; + expect(hotPotato(names, 6).winner).to.equal('Ingrid'); + expect(hotPotato(names, 7).winner).to.equal('John'); + expect(hotPotato(names, 8).winner).to.equal('Jack'); + expect(hotPotato(names, 9).winner).to.equal('Ingrid'); + expect(hotPotato(names, 10).winner).to.equal('Carl'); + }); +}); diff --git a/test/js/others/palindrome-checker.spec.js b/test/js/others/palindrome-checker.spec.js new file mode 100644 index 00000000..c5664a31 --- /dev/null +++ b/test/js/others/palindrome-checker.spec.js @@ -0,0 +1,19 @@ +import 'mocha'; +import { expect } from 'chai'; +import { palindromeChecker } from '../../../src/js/others/palindrome-checker'; + +describe('Palindrome', () => { + it('Palindrome Checker', () => { + expect(palindromeChecker('')).to.equal(false); + expect(palindromeChecker('a')).to.equal(true); + expect(palindromeChecker('aa')).to.equal(true); + expect(palindromeChecker('aba')).to.equal(true); + expect(palindromeChecker('ab')).to.equal(false); + expect(palindromeChecker('kayak')).to.equal(true); + expect(palindromeChecker('radar')).to.equal(true); + expect(palindromeChecker('level')).to.equal(true); + expect(palindromeChecker('Was it a car or a cat I saw')).to.equal(true); + expect(palindromeChecker('Step on no pets')).to.equal(true); + expect(palindromeChecker('Able was I ere I saw Elba')).to.equal(true); + }); +}); diff --git a/test/ts/algorithms/backtracking/rat-in-maze.spec.ts b/test/ts/algorithms/backtracking/rat-in-maze.spec.ts new file mode 100644 index 00000000..0a292984 --- /dev/null +++ b/test/ts/algorithms/backtracking/rat-in-maze.spec.ts @@ -0,0 +1,21 @@ +import 'mocha'; +import { expect } from 'chai'; +import { ratInAMaze } from '../../../../src/ts/index'; + +describe('Rat in a maze', () => { + it('rat in a maze solver', () => { + const maze = [ + [1, 0, 0, 0], + [1, 1, 1, 1], + [0, 0, 1, 0], + [0, 1, 1, 1] + ]; + const solution = [ + [1, 0, 0, 0], + [1, 1, 1, 0], + [0, 0, 1, 0], + [0, 0, 1, 1] + ]; + expect(ratInAMaze(maze)).to.deep.equal(solution); + }); +}); diff --git a/test/ts/algorithms/backtracking/sudoku-solver.spec.ts b/test/ts/algorithms/backtracking/sudoku-solver.spec.ts new file mode 100644 index 00000000..e747683b --- /dev/null +++ b/test/ts/algorithms/backtracking/sudoku-solver.spec.ts @@ -0,0 +1,57 @@ +import 'mocha'; +import { expect } from 'chai'; +import { sudokuSolver } from '../../../../src/ts/index'; + +describe('Sudoku Solver', () => { + it('sudoku solver', () => { + const grid = [ + [3, 0, 6, 5, 0, 8, 4, 0, 0], + [5, 2, 0, 0, 0, 0, 0, 0, 0], + [0, 8, 7, 0, 0, 0, 0, 3, 1], + [0, 0, 3, 0, 1, 0, 0, 8, 0], + [9, 0, 0, 8, 6, 3, 0, 0, 5], + [0, 5, 0, 0, 9, 0, 6, 0, 0], + [1, 3, 0, 0, 0, 0, 2, 5, 0], + [0, 0, 0, 0, 0, 0, 0, 7, 4], + [0, 0, 5, 2, 0, 6, 3, 0, 0] + ]; + const solution = [ + [3, 1, 6, 5, 7, 8, 4, 9, 2], + [5, 2, 9, 1, 3, 4, 7, 6, 8], + [4, 8, 7, 6, 2, 9, 5, 3, 1], + [2, 6, 3, 4, 1, 5, 9, 8, 7], + [9, 7, 4, 8, 6, 3, 1, 2, 5], + [8, 5, 1, 7, 9, 2, 6, 4, 3], + [1, 3, 8, 9, 4, 7, 2, 5, 6], + [6, 9, 2, 3, 5, 1, 8, 7, 4], + [7, 4, 5, 2, 8, 6, 3, 1, 9] + ]; + expect(sudokuSolver(grid)).to.deep.equal(solution); + }); + + it('sudoku solver 2', () => { + const grid = [ + [5, 3, 0, 0, 7, 0, 0, 0, 0], + [6, 0, 0, 1, 9, 5, 0, 0, 0], + [0, 9, 8, 0, 0, 0, 0, 6, 0], + [8, 0, 0, 0, 6, 0, 0, 0, 3], + [4, 0, 0, 8, 0, 3, 0, 0, 1], + [7, 0, 0, 0, 2, 0, 0, 0, 6], + [0, 6, 0, 0, 0, 0, 2, 8, 0], + [0, 0, 0, 4, 1, 9, 0, 0, 5], + [0, 0, 0, 0, 8, 0, 0, 7, 9] + ]; + const solution = [ + [5, 3, 4, 6, 7, 8, 9, 1, 2], + [6, 7, 2, 1, 9, 5, 3, 4, 8], + [1, 9, 8, 3, 4, 2, 5, 6, 7], + [8, 5, 9, 7, 6, 1, 4, 2, 3], + [4, 2, 6, 8, 5, 3, 7, 9, 1], + [7, 1, 3, 9, 2, 4, 8, 5, 6], + [9, 6, 1, 5, 3, 7, 2, 8, 4], + [2, 8, 7, 4, 1, 9, 6, 3, 5], + [3, 4, 5, 2, 8, 6, 1, 7, 9] + ]; + expect(sudokuSolver(grid)).to.deep.equal(solution); + }); +}); diff --git a/test/ts/algorithms/dynamic-programming/knapsack-recursive.spec.ts b/test/ts/algorithms/dynamic-programming/knapsack-recursive.spec.ts new file mode 100644 index 00000000..944cd655 --- /dev/null +++ b/test/ts/algorithms/dynamic-programming/knapsack-recursive.spec.ts @@ -0,0 +1,15 @@ +import 'mocha'; +import { expect } from 'chai'; +import { knapSackRecursive } from '../../../../src/ts/index'; + +describe('KnapSack Dynamic Programming - Recursive', () => { + + it('works with recursive approach', () => { + const values = [3, 4, 5]; + const weights = [2, 3, 4]; + const capacity = 5; + const n = values.length; + + expect(knapSackRecursive(capacity, weights, values, n)).to.equal(7); + }); +}); diff --git a/test/ts/algorithms/dynamic-programming/knapsack.spec.ts b/test/ts/algorithms/dynamic-programming/knapsack.spec.ts new file mode 100644 index 00000000..113f9182 --- /dev/null +++ b/test/ts/algorithms/dynamic-programming/knapsack.spec.ts @@ -0,0 +1,15 @@ +import 'mocha'; +import { expect } from 'chai'; +import { knapSack } from '../../../../src/ts/index'; + +describe('KnapSack Dynamic Programming', () => { + + it('works with DP approach', () => { + const values = [3, 4, 5]; + const weights = [2, 3, 4]; + const capacity = 5; + const n = values.length; + + expect(knapSack(capacity, weights, values, n)).to.equal(7); + }); +}); diff --git a/test/ts/algorithms/dynamic-programming/longest-common-subsequence-print.spec.ts b/test/ts/algorithms/dynamic-programming/longest-common-subsequence-print.spec.ts new file mode 100644 index 00000000..4626c593 --- /dev/null +++ b/test/ts/algorithms/dynamic-programming/longest-common-subsequence-print.spec.ts @@ -0,0 +1,13 @@ +import 'mocha'; +import { expect } from 'chai'; +import { lcsPrint } from '../../../../src/ts/index'; + +describe('LCS Dynamic Programming with print solution', () => { + + it('works with DP approach with print solution', () => { + const wordX = 'acbaed'; + const wordY = 'abcadf'; + + expect(lcsPrint(wordX, wordY)).to.equal('acad'); + }); +}); diff --git a/test/ts/algorithms/dynamic-programming/longest-common-subsequence.spec.ts b/test/ts/algorithms/dynamic-programming/longest-common-subsequence.spec.ts new file mode 100644 index 00000000..3da8abcd --- /dev/null +++ b/test/ts/algorithms/dynamic-programming/longest-common-subsequence.spec.ts @@ -0,0 +1,13 @@ +import 'mocha'; +import { expect } from 'chai'; +import { lcs } from '../../../../src/ts/index'; + +describe('LCS Dynamic Programming', () => { + + it('works with DP approach', () => { + const wordX = 'acbaed'; + const wordY = 'abcadf'; + + expect(lcs(wordX, wordY)).to.equal(4); + }); +}); diff --git a/test/ts/algorithms/dynamic-programming/matrix-chain-multiplication.spec.ts b/test/ts/algorithms/dynamic-programming/matrix-chain-multiplication.spec.ts new file mode 100644 index 00000000..09b58d2d --- /dev/null +++ b/test/ts/algorithms/dynamic-programming/matrix-chain-multiplication.spec.ts @@ -0,0 +1,12 @@ +import 'mocha'; +import { expect } from 'chai'; +import { matrixChainOrder } from '../../../../src/ts/index'; + +describe('Matrix Chain Multiplication', () => { + + it('works with DP approach', () => { + const p = [10, 100, 5, 50, 1]; + + expect(matrixChainOrder(p)).to.equal(1750); + }); +}); diff --git a/test/ts/algorithms/dynamic-programming/min-coin-change.spec.ts b/test/ts/algorithms/dynamic-programming/min-coin-change.spec.ts new file mode 100644 index 00000000..26821b06 --- /dev/null +++ b/test/ts/algorithms/dynamic-programming/min-coin-change.spec.ts @@ -0,0 +1,30 @@ +import 'mocha'; +import { expect } from 'chai'; +import { minCoinChange } from '../../../../src/ts/index'; + +describe('Dynamic Programming: Min Coin Change', () => { + + it('works with amount 0', () => { + expect(minCoinChange([1, 2, 3], 0)).to.deep.equal([]); + }); + + it('works with amount 1', () => { + expect(minCoinChange([1, 2, 3], 1)).to.deep.equal([1]); + }); + + it('works with amount 2', () => { + expect(minCoinChange([1, 2, 3], 2)).to.deep.equal([2]); + }); + + it('works with amount 3', () => { + expect(minCoinChange([1, 2, 3], 3)).to.deep.equal([3]); + }); + + it('works with amount 4', () => { + expect(minCoinChange([1, 2, 3], 4)).to.deep.equal([1, 3]); + }); + + it('works with amount 6', () => { + expect(minCoinChange([1, 2, 3], 6)).to.deep.equal([3, 3]); + }); +}); diff --git a/test/ts/algorithms/graph/breadth-first-search.spec.ts b/test/ts/algorithms/graph/breadth-first-search.spec.ts new file mode 100644 index 00000000..db5f929f --- /dev/null +++ b/test/ts/algorithms/graph/breadth-first-search.spec.ts @@ -0,0 +1,47 @@ +import 'mocha'; +import { expect } from 'chai'; +import { BFS, breadthFirstSearch, Graph } from '../../../../src/ts'; + +describe('Breadth First Search', () => { + + let count: number; + const vertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']; + let graph: Graph; + + beforeEach(() => { + count = 0; + graph = new Graph(); + + for (let i = 0; i < vertices.length; i++) { + graph.addVertex(vertices[i]); + } + + graph.addEdge('A', 'B'); + graph.addEdge('A', 'C'); + graph.addEdge('A', 'D'); + graph.addEdge('C', 'D'); + graph.addEdge('C', 'G'); + graph.addEdge('D', 'G'); + graph.addEdge('D', 'H'); + graph.addEdge('B', 'E'); + graph.addEdge('B', 'F'); + graph.addEdge('E', 'I'); + }); + + it('breadthFirstSearch', () => { + breadthFirstSearch(graph, vertices[0], assertCallback); + }); + + function assertCallback(value: string) { + expect(value).to.equal(vertices[count]); + count++; + } + + it('sorthest path - BFS', () => { + const shortestPathA = BFS(graph, vertices[0]); + + expect(shortestPathA.distances).to.deep.equal({A: 0, B: 1, C: 1, D: 1, E: 2,  F: 2, G: 2, H: 2, I: 3}); + expect(shortestPathA.predecessors).to.deep.equal({A: null, B: 'A', C: 'A', D: 'A', E: 'B',  F: 'B', G: 'C', H: 'D', I: 'E'}); + }); + +}); diff --git a/test/ts/algorithms/graph/depth-first-search.spec.ts b/test/ts/algorithms/graph/depth-first-search.spec.ts new file mode 100644 index 00000000..763284a7 --- /dev/null +++ b/test/ts/algorithms/graph/depth-first-search.spec.ts @@ -0,0 +1,58 @@ +import 'mocha'; +import { expect } from 'chai'; +import { DFS, depthFirstSearch, Graph } from '../../../../src/ts/index'; + +describe('Depth First Search', () => { + let count: number; + const vertices = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']; + const dfsCallBack = ['A', 'B', 'E', 'I', 'F', 'C', 'D', 'G', 'H']; + let graph: Graph; + + beforeEach(() => { + count = 0; + graph = new Graph(true); + }); + + it('depthFirstSearch', () => { + for (let i = 0; i < vertices.length; i++) { + graph.addVertex(vertices[i]); + } + + graph.addEdge('A', 'B'); + graph.addEdge('A', 'C'); + graph.addEdge('A', 'D'); + graph.addEdge('C', 'D'); + graph.addEdge('C', 'G'); + graph.addEdge('D', 'G'); + graph.addEdge('D', 'H'); + graph.addEdge('B', 'E'); + graph.addEdge('B', 'F'); + graph.addEdge('E', 'I'); + + depthFirstSearch(graph, assertCallback); + }); + + function assertCallback(value: string) { + expect(value).to.equal(dfsCallBack[count]); + count++; + } + + it('topological sort - DFS', () => { + const myVertices = ['A', 'B', 'C', 'D', 'E', 'F']; + for (let i = 0; i < myVertices.length; i++) { + graph.addVertex(myVertices[i]); + } + graph.addEdge('A', 'C'); + graph.addEdge('A', 'D'); + graph.addEdge('B', 'D'); + graph.addEdge('B', 'E'); + graph.addEdge('C', 'F'); + graph.addEdge('F', 'E'); + + const result = DFS(graph); + + expect(result.discovery).to.deep.equal({A: 1, B: 11, C: 2, D: 8, E: 4, F: 3}); + expect(result.finished).to.deep.equal({A: 10, B: 12, C: 7, D: 9, E: 5, F: 6}); + expect(result.predecessors).to.deep.equal({A: null, B: null, C: 'A', D: 'A', E: 'F', F: 'C'}); + }); +}); diff --git a/test/ts/algorithms/graph/dijkstra.spec.ts b/test/ts/algorithms/graph/dijkstra.spec.ts new file mode 100644 index 00000000..05b2e2f9 --- /dev/null +++ b/test/ts/algorithms/graph/dijkstra.spec.ts @@ -0,0 +1,21 @@ +import 'mocha'; +import { expect } from 'chai'; +import { dijkstra } from '../../../../src/ts/index'; + +describe('Dijkstra\'s Algorithm - Shortest Path', () => { + + it('Shortest Path', () => { + const graph = [ + [0, 2, 4, 0, 0, 0], + [0, 0, 2, 4, 2, 0], + [0, 0, 0, 0, 3, 0], + [0, 0, 0, 0, 0, 2], + [0, 0, 0, 3, 0, 2], + [0, 0, 0, 0, 0, 0] + ]; + + expect(dijkstra(graph, 0)).to.deep.equal([0, 2, 4, 6, 4, 6]); + + }); + +}); diff --git a/test/ts/algorithms/graph/floyd-warshall.spec.ts b/test/ts/algorithms/graph/floyd-warshall.spec.ts new file mode 100644 index 00000000..cf0adae2 --- /dev/null +++ b/test/ts/algorithms/graph/floyd-warshall.spec.ts @@ -0,0 +1,26 @@ +import 'mocha'; +import { expect } from 'chai'; +import { floydWarshall } from '../../../../src/ts/index'; + +describe('Floyd-Warshall Algorithm - All-Pairs Shortest Path', () => { + it('All-Pairs Shortest Path', () => { + const INF = Infinity; + const graph = [ + [INF, 2, 4, INF, INF, INF], + [INF, INF, 2, 4, 2, INF], + [INF, INF, INF, INF, 3, INF], + [INF, INF, INF, INF, INF, 2], + [INF, INF, INF, 3, INF, 2], + [INF, INF, INF, INF, INF, INF] + ]; + + expect(floydWarshall(graph)).to.deep.equal([ + [0, 2, 4, 6, 4, 6], + [INF, 0, 2, 4, 2, 4], + [INF, INF, 0, 6, 3, 5], + [INF, INF, INF, 0, INF, 2], + [INF, INF, INF, 3, 0, 2], + [INF, INF, INF, INF, INF, 0] + ]); + }); +}); diff --git a/test/ts/algorithms/graph/kruskal.spec.ts b/test/ts/algorithms/graph/kruskal.spec.ts new file mode 100644 index 00000000..838c643e --- /dev/null +++ b/test/ts/algorithms/graph/kruskal.spec.ts @@ -0,0 +1,18 @@ +import 'mocha'; +import { expect } from 'chai'; +import { kruskal } from '../../../../src/ts/index'; + +describe('Kruskal Algorithm - Minimum Spanning Tree', () => { + it('Minimum Spanning Tree', () => { + const graph = [ + [0, 2, 4, 0, 0, 0], + [2, 0, 2, 4, 2, 0], + [4, 2, 0, 0, 3, 0], + [0, 4, 0, 0, 3, 2], + [0, 2, 3, 3, 0, 2], + [0, 0, 0, 2, 2, 0] + ]; + + expect(kruskal(graph)).to.deep.equal([ , 0, 1, 1, 1, 3]); + }); +}); diff --git a/test/ts/algorithms/graph/prim.spec.ts b/test/ts/algorithms/graph/prim.spec.ts new file mode 100644 index 00000000..18224d71 --- /dev/null +++ b/test/ts/algorithms/graph/prim.spec.ts @@ -0,0 +1,18 @@ +import 'mocha'; +import { expect } from 'chai'; +import { prim } from '../../../../src/ts/index'; + +describe('Prim\'s Algorithm - Minimum Spanning Tree', () => { + it('Minimum Spanning Tree', () => { + const graph = [ + [0, 2, 4, 0, 0, 0], + [2, 0, 2, 4, 2, 0], + [4, 2, 0, 0, 3, 0], + [0, 4, 0, 0, 3, 2], + [0, 2, 3, 3, 0, 2], + [0, 0, 0, 2, 2, 0] + ]; + + expect(prim(graph)).to.deep.equal([-1, 0, 1, 5, 1, 4]); + }); +}); diff --git a/test/ts/algorithms/greedy/knapsack.spec.ts b/test/ts/algorithms/greedy/knapsack.spec.ts new file mode 100644 index 00000000..de73ff47 --- /dev/null +++ b/test/ts/algorithms/greedy/knapsack.spec.ts @@ -0,0 +1,14 @@ +import 'mocha'; +import { expect } from 'chai'; +import { knapSackGreedy } from '../../../../src/ts/index'; + +describe('KnapSack Greedy', () => { + + it('works with greedy approach', () => { + const values = [3, 4, 5]; + const weights = [2, 3, 4]; + const capacity = 5; + + expect(knapSackGreedy(capacity, weights, values)).to.equal(7); + }); +}); diff --git a/test/ts/algorithms/greedy/longest-common-subsequence.spec.ts b/test/ts/algorithms/greedy/longest-common-subsequence.spec.ts new file mode 100644 index 00000000..82d4000a --- /dev/null +++ b/test/ts/algorithms/greedy/longest-common-subsequence.spec.ts @@ -0,0 +1,13 @@ +import 'mocha'; +import { expect } from 'chai'; +import { lcsRecursive } from '../../../../src/ts/index'; + +describe('LCS Greedy', () => { + + it('works with Greedy approach', () => { + const wordX = 'acbaed'; + const wordY = 'abcadf'; + + expect(lcsRecursive(wordX, wordY)).to.equal(4); + }); +}); diff --git a/test/ts/algorithms/greedy/matrix-chain-multiplication.spec.ts b/test/ts/algorithms/greedy/matrix-chain-multiplication.spec.ts new file mode 100644 index 00000000..d6655752 --- /dev/null +++ b/test/ts/algorithms/greedy/matrix-chain-multiplication.spec.ts @@ -0,0 +1,12 @@ +import 'mocha'; +import { expect } from 'chai'; +import { matrixChainOrderGreedy } from '../../../../src/ts/index'; + +describe('Matrix Chain Multiplication', () => { + + it('works with DP approach', () => { + const p = [10, 100, 5, 50, 1]; + + expect(matrixChainOrderGreedy(p)).to.equal(1750); + }); +}); diff --git a/test/ts/algorithms/greedy/min-coin-change.spec.ts b/test/ts/algorithms/greedy/min-coin-change.spec.ts new file mode 100644 index 00000000..946d19ff --- /dev/null +++ b/test/ts/algorithms/greedy/min-coin-change.spec.ts @@ -0,0 +1,12 @@ +import 'mocha'; +import { expect } from 'chai'; +import { minCoinChangeGreedy } from '../../../../src/ts/index'; + +describe('Min Coin Change Greedy', () => { + + it('works with greedy approach', () => { + expect(minCoinChangeGreedy([1, 5, 10], 15)).to.deep.equal([10, 5]); + expect(minCoinChangeGreedy([1, 3, 4], 6)).to.deep.equal([4, 1, 1]); + }); + +}); diff --git a/test/ts/algorithms/math/find-divisors.spec.ts b/test/ts/algorithms/math/find-divisors.spec.ts new file mode 100644 index 00000000..b4223378 --- /dev/null +++ b/test/ts/algorithms/math/find-divisors.spec.ts @@ -0,0 +1,17 @@ +import 'mocha'; +import { expect } from 'chai'; +import { findDivisors } from '../../../../src/ts/index'; + +describe('Find Divisors', () => { + + it('returns the divisors of the number', () => { + + expect(findDivisors(-1)).to.deep.equal([]); + expect(findDivisors(0)).to.deep.equal([]); + expect(findDivisors(1)).to.deep.equal([1]); + expect(findDivisors(2)).to.deep.equal([1, 2]); + expect(findDivisors(3)).to.deep.equal([1, 3]); + expect(findDivisors(4)).to.deep.equal([1, 2, 4]); + expect(findDivisors(100)).to.deep.equal([1, 2, 4, 5, 10, 20, 25, 50, 100 ]); + }); +}); diff --git a/test/ts/algorithms/math/gcd.spec.ts b/test/ts/algorithms/math/gcd.spec.ts new file mode 100644 index 00000000..75a66ae6 --- /dev/null +++ b/test/ts/algorithms/math/gcd.spec.ts @@ -0,0 +1,28 @@ +import 'mocha'; +import { expect } from 'chai'; +import { gcd } from '../../../../src/ts/index'; + +describe('GCD', () => { + it('returns the correct GCD for positive numbers', () => { + expect(gcd(8, 12)).to.equal(4); + expect(gcd(15, 25)).to.equal(5); + expect(gcd(21, 28)).to.equal(7); + }); + + it('returns the correct GCD for negative numbers', () => { + expect(gcd(-8, 12)).to.equal(4); + expect(gcd(15, -25)).to.equal(5); + expect(gcd(-21, -28)).to.equal(7); + }); + + it('returns the correct GCD when one of the numbers is 0', () => { + expect(gcd(0, -12)).to.equal(12); + expect(gcd(15, 0)).to.equal(15); + }); + + it('returns 1 for co-prime numbers', () => { + expect(gcd(7, 22)).to.equal(1); + expect(gcd(11, 28)).to.equal(1); + expect(gcd(9, 16)).to.equal(1); + }); +}); diff --git a/test/ts/algorithms/math/greatest-difference.spec.ts b/test/ts/algorithms/math/greatest-difference.spec.ts new file mode 100644 index 00000000..889e4ef6 --- /dev/null +++ b/test/ts/algorithms/math/greatest-difference.spec.ts @@ -0,0 +1,14 @@ +import 'mocha'; +import { expect } from 'chai'; +import { greatestDifference } from '../../../../src/ts/index'; + +describe('Greatest Difference', () => { + + it('returns the gcd between two numbers', () => { + + expect(greatestDifference([5, 6, 7, 2, 10])).to.equal(8); + expect(greatestDifference([1, 2, 4])).to.equal(3); + expect(greatestDifference([1, 3])).to.equal(2); + + }); +}); diff --git a/test/ts/algorithms/math/lcm.spec.ts b/test/ts/algorithms/math/lcm.spec.ts new file mode 100644 index 00000000..2262161c --- /dev/null +++ b/test/ts/algorithms/math/lcm.spec.ts @@ -0,0 +1,16 @@ +import 'mocha'; +import { expect } from 'chai'; +import { lcm } from '../../../../src/ts/index'; + +describe('LCM', () => { + + it('returns the lcm between two numbers', () => { + + expect(lcm(0, 0)).to.equal(0); + expect(lcm(1, 1)).to.equal(1); + expect(lcm(1, 2)).to.equal(2); + expect(lcm(2, 4)).to.equal(4); + expect(lcm(2, 3)).to.equal(6); + + }); +}); diff --git a/test/ts/algorithms/math/primality-test.spec.ts b/test/ts/algorithms/math/primality-test.spec.ts new file mode 100644 index 00000000..36680623 --- /dev/null +++ b/test/ts/algorithms/math/primality-test.spec.ts @@ -0,0 +1,30 @@ +import 'mocha'; +import { expect } from 'chai'; +import { isPrime, testPrime, isPrime2 } from '../../../../src/ts/index'; + +describe('Primality Tests', () => { + + it('returns if the number is prime or not - isPrime', () => { + testIsPrime(isPrime); + }); + + it('returns if the number is prime or not - testPrime', () => { + testIsPrime(testPrime); + }); + + it('returns if the number is prime or not - isPrime2', () => { + testIsPrime(isPrime2); + }); + + function testIsPrime(primeFunction: Function) { + expect(primeFunction(-1)).to.equal(false); + expect(primeFunction(0)).to.equal(false); + expect(primeFunction(1)).to.equal(false); + expect(primeFunction(2)).to.equal(true); + expect(primeFunction(3)).to.equal(true); + expect(primeFunction(4)).to.equal(false); + expect(primeFunction(5)).to.equal(true); + expect(primeFunction(10)).to.equal(false); + expect(primeFunction(113)).to.equal(true); + } +}); diff --git a/test/ts/algorithms/math/sieve-eratosthenes.spec.ts b/test/ts/algorithms/math/sieve-eratosthenes.spec.ts new file mode 100644 index 00000000..1cd31c2d --- /dev/null +++ b/test/ts/algorithms/math/sieve-eratosthenes.spec.ts @@ -0,0 +1,17 @@ +import 'mocha'; +import { expect } from 'chai'; +import { sieveOfEratosthenes } from '../../../../src/ts/index'; + +describe('Sieve Of Eratosthene', () => { + + it('returns the prime numbers', () => { + + expect(sieveOfEratosthenes(0)).to.deep.equal([]); + expect(sieveOfEratosthenes(1)).to.deep.equal([]); + expect(sieveOfEratosthenes(2)).to.deep.equal([2]); + expect(sieveOfEratosthenes(3)).to.deep.equal([2, 3]); + expect(sieveOfEratosthenes(4)).to.deep.equal([2, 3]); + expect(sieveOfEratosthenes(5)).to.deep.equal([2, 3, 5]); + + }); +}); diff --git a/test/ts/algorithms/search/binary-search-recursive.spec.ts b/test/ts/algorithms/search/binary-search-recursive.spec.ts new file mode 100644 index 00000000..b06ce773 --- /dev/null +++ b/test/ts/algorithms/search/binary-search-recursive.spec.ts @@ -0,0 +1,5 @@ +import { binarySearchRecursive } from '../../../../src/ts/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(binarySearchRecursive, 'Binary Search Recursive'); + diff --git a/test/ts/algorithms/search/binary-search.spec.ts b/test/ts/algorithms/search/binary-search.spec.ts new file mode 100644 index 00000000..f62d0e96 --- /dev/null +++ b/test/ts/algorithms/search/binary-search.spec.ts @@ -0,0 +1,5 @@ +import { binarySearch } from '../../../../src/ts/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(binarySearch, 'Binary Search'); + diff --git a/test/ts/algorithms/search/interpolation-search.spec.ts b/test/ts/algorithms/search/interpolation-search.spec.ts new file mode 100644 index 00000000..287351f2 --- /dev/null +++ b/test/ts/algorithms/search/interpolation-search.spec.ts @@ -0,0 +1,5 @@ +import { interpolationSearch } from '../../../../src/ts/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(interpolationSearch, 'Interpolation Search', { customEquals: false }); + diff --git a/test/ts/algorithms/search/min-max-search.spec.ts b/test/ts/algorithms/search/min-max-search.spec.ts new file mode 100644 index 00000000..d0dd76c3 --- /dev/null +++ b/test/ts/algorithms/search/min-max-search.spec.ts @@ -0,0 +1,32 @@ +import 'mocha'; +import { expect } from 'chai'; +import { findMinValue, findMaxValue } from '../../../../src/ts/index'; + +describe('Min and Max Values Search', () => { + + const SIZE = 10; + + function createSortedArray() { + const array: number[] = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('min value - works with empty arrays', () => { + expect(findMinValue([])).to.equal(undefined); + }); + + it('max value - works with empty arrays', () => { + expect(findMaxValue([])).to.equal(undefined); + }); + + it('min value', () => { + expect(findMinValue(createSortedArray())).to.equal(1); + }); + + it('max value', () => { + expect(findMaxValue(createSortedArray())).to.equal(SIZE); + }); +}); diff --git a/test/ts/algorithms/search/search-algorithms-tests.ts b/test/ts/algorithms/search/search-algorithms-tests.ts new file mode 100644 index 00000000..dd590f5d --- /dev/null +++ b/test/ts/algorithms/search/search-algorithms-tests.ts @@ -0,0 +1,57 @@ +import 'mocha'; +import { expect } from 'chai'; +import { IEqualsFunction } from '../../../../src/ts/util'; + +interface CustomObject { + key: number; +} + +const customEquals: IEqualsFunction = (a: CustomObject, b: CustomObject) => + a.key === b.key; + +export function testSearchAlgorithm( + searchAlgorithm: Function, + algorithmName: string, + config = { customEquals: true } +) { + describe(algorithmName, () => { + const SIZE = 10; + + function createSortedArray() { + const array: number[] = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('works with empty arrays', () => { + expect(searchAlgorithm([], 1)).to.equal(-1); + }); + + it('finds value at the first position', () => { + const array = createSortedArray(); + expect(searchAlgorithm(array, 1)).to.equal(0); + }); + + it('finds value at the last position', () => { + const array = createSortedArray(); + expect(searchAlgorithm(array, SIZE)).to.equal(SIZE - 1); + }); + + it('finds value at different positions', () => { + const array = createSortedArray(); + + for (let value = 1; value <= SIZE; value++) { + expect(searchAlgorithm(array, value)).to.equal(value - 1); + } + }); + + if (config.customEquals) { + it('finds value with custom equals function', () => { + const array = [{ key: 1 }, { key: 2 }, { key: 3 }]; + expect(searchAlgorithm(array, { key: 2 }, customEquals)).to.equal(1); + }); + } + }); +} diff --git a/test/ts/algorithms/search/sequential-search.spec.ts b/test/ts/algorithms/search/sequential-search.spec.ts new file mode 100644 index 00000000..94ddf885 --- /dev/null +++ b/test/ts/algorithms/search/sequential-search.spec.ts @@ -0,0 +1,5 @@ +import { sequentialSearch } from '../../../../src/ts/index'; +import { testSearchAlgorithm } from './search-algorithms-tests'; + +testSearchAlgorithm(sequentialSearch, 'Sequential Search'); + diff --git "a/test/ts/algorithms/shuffle/fisher\342\200\223yates.spec.ts" "b/test/ts/algorithms/shuffle/fisher\342\200\223yates.spec.ts" new file mode 100644 index 00000000..da450f41 --- /dev/null +++ "b/test/ts/algorithms/shuffle/fisher\342\200\223yates.spec.ts" @@ -0,0 +1,33 @@ +import 'mocha'; +import { expect } from 'chai'; +import { shuffle } from '../../../../src/ts/index'; + +describe('Fisher-Yates Suffle', () => { + + const SIZE = 100; + + function createSortedArray() { + const array: number[] = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('works with empty arrays', () => { + expect(shuffle([])).to.deep.equal([]); + }); + + it('works with arrays with a single value', () => { + const array = [1]; + expect(shuffle(array)).to.deep.equal(array); + }); + + it('works with sorted arrays', () => { + let array = createSortedArray(); + const sortedArray = createSortedArray(); + array = shuffle(array); + expect(array).to.not.deep.equal(sortedArray); + }); + +}); diff --git a/test/ts/algorithms/sorting/bubble-sort-improved.spec.ts b/test/ts/algorithms/sorting/bubble-sort-improved.spec.ts new file mode 100644 index 00000000..7686a5fd --- /dev/null +++ b/test/ts/algorithms/sorting/bubble-sort-improved.spec.ts @@ -0,0 +1,5 @@ +import { modifiedBubbleSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(modifiedBubbleSort, 'Bubble Sort - Improved'); + diff --git a/test/ts/algorithms/sorting/bubble-sort.spec.ts b/test/ts/algorithms/sorting/bubble-sort.spec.ts new file mode 100644 index 00000000..2804fe9c --- /dev/null +++ b/test/ts/algorithms/sorting/bubble-sort.spec.ts @@ -0,0 +1,5 @@ +import { bubbleSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(bubbleSort, 'Bubble Sort'); + diff --git a/test/ts/algorithms/sorting/bucket-sort.spec.ts b/test/ts/algorithms/sorting/bucket-sort.spec.ts new file mode 100644 index 00000000..1a4ec458 --- /dev/null +++ b/test/ts/algorithms/sorting/bucket-sort.spec.ts @@ -0,0 +1,4 @@ +import { bucketSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(bucketSort, 'Bucket Sort', {reverseCompare: false}); diff --git a/test/ts/algorithms/sorting/counting-sort.spec.ts b/test/ts/algorithms/sorting/counting-sort.spec.ts new file mode 100644 index 00000000..c3fee9a5 --- /dev/null +++ b/test/ts/algorithms/sorting/counting-sort.spec.ts @@ -0,0 +1,4 @@ +import { countingSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(countingSort, 'Counting Sort', {reverseCompare: false}); diff --git a/test/ts/algorithms/sorting/heap-sort.spec.ts b/test/ts/algorithms/sorting/heap-sort.spec.ts new file mode 100644 index 00000000..b0b95da9 --- /dev/null +++ b/test/ts/algorithms/sorting/heap-sort.spec.ts @@ -0,0 +1,5 @@ +import { heapSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(heapSort, 'Heap Sort'); + diff --git a/test/ts/algorithms/sorting/insertion-sort.spec.ts b/test/ts/algorithms/sorting/insertion-sort.spec.ts new file mode 100644 index 00000000..86beb941 --- /dev/null +++ b/test/ts/algorithms/sorting/insertion-sort.spec.ts @@ -0,0 +1,5 @@ +import { insertionSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(insertionSort, 'Insertion Sort'); + diff --git a/test/ts/algorithms/sorting/merge-sort.spec.ts b/test/ts/algorithms/sorting/merge-sort.spec.ts new file mode 100644 index 00000000..cf4a7418 --- /dev/null +++ b/test/ts/algorithms/sorting/merge-sort.spec.ts @@ -0,0 +1,5 @@ +import { mergeSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(mergeSort, 'Merge Sort'); + diff --git a/test/ts/algorithms/sorting/quicksort.spec.ts b/test/ts/algorithms/sorting/quicksort.spec.ts new file mode 100644 index 00000000..348c58f4 --- /dev/null +++ b/test/ts/algorithms/sorting/quicksort.spec.ts @@ -0,0 +1,5 @@ +import { quickSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(quickSort, 'Quick Sort'); + diff --git a/test/ts/algorithms/sorting/radix-sort.spec.ts b/test/ts/algorithms/sorting/radix-sort.spec.ts new file mode 100644 index 00000000..36f909ce --- /dev/null +++ b/test/ts/algorithms/sorting/radix-sort.spec.ts @@ -0,0 +1,5 @@ +import { radixSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(radixSort, 'Radix Sort', {reverseCompare: false}); + diff --git a/test/ts/algorithms/sorting/selection-sort.spec.ts b/test/ts/algorithms/sorting/selection-sort.spec.ts new file mode 100644 index 00000000..a1359074 --- /dev/null +++ b/test/ts/algorithms/sorting/selection-sort.spec.ts @@ -0,0 +1,5 @@ +import { selectionSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(selectionSort, 'Selection Sort'); + diff --git a/test/ts/algorithms/sorting/shell-sort.spec.ts b/test/ts/algorithms/sorting/shell-sort.spec.ts new file mode 100644 index 00000000..4683a70c --- /dev/null +++ b/test/ts/algorithms/sorting/shell-sort.spec.ts @@ -0,0 +1,5 @@ +import { shellSort } from '../../../../src/ts/index'; +import { testSortAlgorithm } from './sort-algorithm-tests'; + +testSortAlgorithm(shellSort, 'Shell Sort'); + diff --git a/test/ts/algorithms/sorting/sort-algorithm-tests.ts b/test/ts/algorithms/sorting/sort-algorithm-tests.ts new file mode 100644 index 00000000..c1bacf3d --- /dev/null +++ b/test/ts/algorithms/sorting/sort-algorithm-tests.ts @@ -0,0 +1,73 @@ +import 'mocha'; +import { expect } from 'chai'; +import { Compare } from '../../../../src/ts/util'; + +export function testSortAlgorithm( + sortAlgorithm: Function, + algorithmName: string, + config = { reverseCompare: true } +) { + describe(algorithmName, () => { + const SIZE = 100; + + function createNonSortedArray() { + const array: number[] = []; + for (let i = SIZE; i > 0; i--) { + array.push(i); + } + return array; + } + + function createSortedArray() { + const array: number[] = []; + for (let i = 1; i <= SIZE; i++) { + array.push(i); + } + return array; + } + + it('works with empty arrays', () => { + expect(sortAlgorithm([])).to.deep.equal([]); + }); + + it('works with sorted arrays', () => { + let array = createSortedArray(); + const sortedArray = createSortedArray(); + array = sortAlgorithm(array); + expect(array).to.deep.equal(sortedArray); + }); + + it('works with non-sorted arrays', () => { + let array = createNonSortedArray(); + const sortedArray = createSortedArray(); + array = sortAlgorithm(array); + + expect(array).to.deep.equal(sortedArray); + + for (let i = 0; i < array.length - 1; i++) { + expect(array[i] <= array[i + 1]).to.equal(true); + } + }); + + function reverseCompare(a: T, b: T): number { + if (a === b) { + return 0; + } + return a < b ? Compare.BIGGER_THAN : Compare.LESS_THAN; + } + + if (config.reverseCompare) { + it('works with reverse comparator - descending order', () => { + let array = createSortedArray(); + const sortedArray = createNonSortedArray(); + array = sortAlgorithm(array, reverseCompare); + + expect(array).to.deep.equal(sortedArray); + + for (let i = 0; i < array.length - 1; i++) { + expect(array[i] >= array[i + 1]).to.equal(true); + } + }); + } + }); +} diff --git a/test/ts/data-structures/avl-tree.spec.ts b/test/ts/data-structures/avl-tree.spec.ts new file mode 100644 index 00000000..95562b95 --- /dev/null +++ b/test/ts/data-structures/avl-tree.spec.ts @@ -0,0 +1,32 @@ +import 'mocha'; +import { expect } from 'chai'; +import { AVLTree } from '../../../src/ts/index'; + +describe('AVLTree', () => { + let tree: AVLTree; + + beforeEach(() => { + tree = new AVLTree(); + }); + + it('starts empty', () => { + expect(tree.getRoot()).to.equal(undefined); + }); + + it('inserts elements in the AVLTree', () => { + expect(tree.getRoot()).to.equal(undefined); + + tree.insert(1); + tree.insert(2); + tree.insert(3); + tree.insert(4); + tree.insert(5); + tree.insert(6); + tree.insert(7); + tree.insert(14); + tree.insert(15); + tree.insert(13); + tree.insert(12); + tree.insert(11); + }); +}); diff --git a/test/ts/data-structures/binary-search-tree.spec.ts b/test/ts/data-structures/binary-search-tree.spec.ts new file mode 100644 index 00000000..419f8e10 --- /dev/null +++ b/test/ts/data-structures/binary-search-tree.spec.ts @@ -0,0 +1,109 @@ +import 'mocha'; +import { expect } from 'chai'; +import { BinarySearchTree } from '../../../src/ts/index'; + +describe('BinarySearchTree', () => { + let tree: BinarySearchTree; + + beforeEach(() => { + tree = new BinarySearchTree(); + }); + + it('starts empty', () => { + expect(tree.getRoot()).to.equal(undefined); + }); + + function assertNode(node: any, key: number, left: number, right: number) { + + if (key != null) { + expect(node.key).to.equal(key); + } else { + expect(node).to.equal(key); + return; + } + + if (left != null) { + expect(node.left.key).to.equal(left); + } else { + expect(node.left).to.equal(left); + } + + if (right != null) { + expect(node.right.key).to.equal(right); + } else { + expect(node.right).to.equal(right); + } + } + + it('inserts elements in the BST', () => { + expect(tree.getRoot()).to.equal(undefined); + + tree.insert(11); + tree.insert(7); + tree.insert(15); + tree.insert(5); + tree.insert(3); + tree.insert(9); + tree.insert(8); + tree.insert(10); + tree.insert(13); + tree.insert(12); + tree.insert(14); + tree.insert(20); + tree.insert(18); + tree.insert(25); + + let node = tree.getRoot(); + assertNode(node, 11, 7, 15); + + node = node.left; + assertNode(node, 7, 5, 9); + + node = node.left; + assertNode(node, 5, 3, undefined); + + node = node.left; + assertNode(node, 3, undefined, undefined); + + node = tree.getRoot().left.left.right; + assertNode(node, undefined, undefined, undefined); + + node = tree.getRoot().left.right; + assertNode(node, 9, 8, 10); + + node = node.left; + assertNode(node, 8, undefined, undefined); + + node = tree.getRoot().left.right.right; + assertNode(node, 10, undefined, undefined); + + node = tree.getRoot().right; + assertNode(node, 15, 13, 20); + + node = node.left; + assertNode(node, 13, 12, 14); + + node = node.left; + assertNode(node, 12, undefined, undefined); + + node = tree.getRoot().right.left.right; + assertNode(node, 14, undefined, undefined); + + node = tree.getRoot().right.right; + assertNode(node, 20, 18, 25); + + node = node.left; + assertNode(node, 18, undefined, undefined); + + node = tree.getRoot().right.right.right; + assertNode(node, 25, undefined, undefined); + }); + + it('verifies if element exists', () => { + expect(tree.getRoot()).to.equal(undefined); + }); + + it('removes a leaf', () => { + expect(tree.getRoot()).to.equal(undefined); + }); +}); diff --git a/test/ts/data-structures/circular-linked-list.spec.ts b/test/ts/data-structures/circular-linked-list.spec.ts new file mode 100644 index 00000000..78312614 --- /dev/null +++ b/test/ts/data-structures/circular-linked-list.spec.ts @@ -0,0 +1,342 @@ +import 'mocha'; +import { expect } from 'chai'; +import { CircularLinkedList } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('CircularLinkedList', () => { + let list: CircularLinkedList; + let min: number; + let max: number; + + beforeEach(() => { + list = new CircularLinkedList(); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = min; i <= max; i++) { + list.push(i); + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max && current; i++) { + expect(current).to.not.be.an('undefined'); + if (current) { + // TS strictNullChecks + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + // TS strictNullChecks + expect(current.next.element).to.equal(i + 1); + } + } else { + // circular list + expect(current.next).to.not.be.an('undefined'); + expect(current.next).to.equal(list.getHead()); + if (current.next) { + expect(current.next.element).to.equal(min); + } + } + current = current.next; + } + } + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max, 0)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + expect(list.insert(1, 1)).to.equal(false); + }); + + it('inserts elements invalid position not empty list', () => { + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(false); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i , i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + const minIndex = min; + for (let i = minIndex; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + min++; + verifyList(); + } + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(min); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(max); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(max); + expect(current.next).to.not.be.an('undefined'); + expect(current.next).to.equal(list.getHead()); + if (current.next) { + expect(current.next.element).to.equal(min); + } + } + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new CircularLinkedList(); + ds.push('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new CircularLinkedList(); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/ts/data-structures/deque.spec.ts b/test/ts/data-structures/deque.spec.ts new file mode 100644 index 00000000..7dcb4c8a --- /dev/null +++ b/test/ts/data-structures/deque.spec.ts @@ -0,0 +1,204 @@ +import 'mocha'; +import { expect } from 'chai'; +import Deque from '../../../src/ts/data-structures/deque'; + +describe('Deque', () => { + let deque: Deque; + + beforeEach(() => { + deque = new Deque(); + }); + + it('starts empty', () => { + expect(deque.size()).to.equal(0); + expect(deque.isEmpty()).to.equal(true); + }); + + it('add elements in the back', () => { + deque.addBack(1); + expect(deque.size()).to.equal(1); + + deque.addBack(2); + expect(deque.size()).to.equal(2); + + deque.addBack(3); + expect(deque.size()).to.equal(3); + }); + + it('add elements in the front', () => { + deque.addFront(1); + expect(deque.size()).to.equal(1); + + deque.addFront(2); + expect(deque.size()).to.equal(2); + + deque.addFront(3); + expect(deque.size()).to.equal(3); + + deque.removeFront(); + deque.addFront(4); + expect(deque.size()).to.equal(3); + }); + + it('remove elements from the back', () => { + deque.addBack(1); + deque.addBack(2); + deque.addBack(3); + deque.addFront(0); + + expect(deque.removeBack()).to.equal(3); + expect(deque.removeBack()).to.equal(2); + expect(deque.removeBack()).to.equal(1); + expect(deque.removeBack()).to.equal(0); + expect(deque.removeBack()).to.equal(undefined); + }); + + it('remove elements from the front', () => { + deque.addFront(1); + deque.addBack(2); + deque.addBack(3); + deque.addFront(0); + deque.addFront(-1); + deque.addFront(-2); + + expect(deque.removeFront()).to.equal(-2); + expect(deque.removeFront()).to.equal(-1); + expect(deque.removeFront()).to.equal(0); + expect(deque.removeFront()).to.equal(1); + expect(deque.removeFront()).to.equal(2); + expect(deque.removeFront()).to.equal(3); + expect(deque.removeFront()).to.equal(undefined); + }); + + it('allows to peek at the front element in the deque without removing it', () => { + expect(deque.peekFront()).to.equal(undefined); + + deque.addFront(1); + expect(deque.peekFront()).to.equal(1); + deque.addBack(2); + expect(deque.peekFront()).to.equal(1); + deque.addBack(3); + expect(deque.peekFront()).to.equal(1); + deque.addFront(0); + expect(deque.peekFront()).to.equal(0); + deque.addFront(-1); + expect(deque.peekFront()).to.equal(-1); + deque.addFront(-2); + expect(deque.peekFront()).to.equal(-2); + }); + + it('allows to peek at the last element in the deque without removing it', () => { + expect(deque.peekBack()).to.equal(undefined); + + deque.addFront(1); + expect(deque.peekBack()).to.equal(1); + deque.addBack(2); + expect(deque.peekBack()).to.equal(2); + deque.addBack(3); + expect(deque.peekBack()).to.equal(3); + deque.addFront(0); + expect(deque.peekBack()).to.equal(3); + deque.addFront(-1); + expect(deque.peekBack()).to.equal(3); + deque.addFront(-2); + expect(deque.peekBack()).to.equal(3); + }); + + it('returns the correct size', () => { + expect(deque.size()).to.equal(0); + + deque.addFront(1); + expect(deque.size()).to.equal(1); + deque.addBack(2); + expect(deque.size()).to.equal(2); + deque.addBack(3); + expect(deque.size()).to.equal(3); + deque.addFront(0); + expect(deque.size()).to.equal(4); + deque.addFront(-1); + expect(deque.size()).to.equal(5); + deque.addFront(-2); + expect(deque.size()).to.equal(6); + + deque.clear(); + expect(deque.size()).to.equal(0); + + deque.addFront(1); + deque.addBack(2); + expect(deque.size()).to.equal(2); + + deque.removeFront(); + deque.removeBack(); + expect(deque.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(deque.isEmpty()).to.equal(true); + + deque.addFront(1); + expect(deque.isEmpty()).to.equal(false); + deque.addBack(2); + expect(deque.isEmpty()).to.equal(false); + + deque.clear(); + expect(deque.isEmpty()).to.equal(true); + + deque.addFront(1); + deque.addBack(2); + expect(deque.isEmpty()).to.equal(false); + + deque.removeFront(); + expect(deque.isEmpty()).to.equal(false); + deque.removeBack(); + expect(deque.isEmpty()).to.equal(true); + }); + + it('clears the queue', () => { + deque.clear(); + expect(deque.isEmpty()).to.equal(true); + + deque.addFront(1); + deque.addBack(2); + expect(deque.isEmpty()).to.equal(false); + + deque.clear(); + expect(deque.isEmpty()).to.equal(true); + }); + + it('returns toString primitive types', () => { + expect(deque.toString()).to.equal(''); + + deque.addFront(1); + expect(deque.toString()).to.equal('1'); + + deque.addBack(2); + expect(deque.toString()).to.equal('1,2'); + + deque.clear(); + expect(deque.toString()).to.equal(''); + + const queueString = new Deque(); + queueString.addFront('el1'); + expect(queueString.toString()).to.equal('el1'); + + queueString.addBack('el2'); + expect(queueString.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + class MyObj { + constructor(public el1: any, public el2: any) {} + toString() { + return `${this.el1.toString()}|${this.el2.toString()}`; + } + } + const dequeMyObj = new Deque(); + expect(dequeMyObj.toString()).to.equal(''); + + dequeMyObj.addFront(new MyObj(1, 2)); + expect(dequeMyObj.toString()).to.equal('1|2'); + + dequeMyObj.addBack(new MyObj(3, 4)); + expect(dequeMyObj.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/ts/data-structures/dictionary.spec.ts b/test/ts/data-structures/dictionary.spec.ts new file mode 100644 index 00000000..28bf6615 --- /dev/null +++ b/test/ts/data-structures/dictionary.spec.ts @@ -0,0 +1,335 @@ +import 'mocha'; +import { expect } from 'chai'; +import { Dictionary } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('Dictionary', () => { + let dictionary: Dictionary; + + beforeEach(() => { + dictionary = new Dictionary(); + }); + + it('starts empty', () => { + expect(dictionary.size()).to.equal(0); + expect(dictionary.isEmpty()).to.equal(true); + }); + + it('sets undefined and null keys and values', () => { + const dict = new Dictionary(); + + expect(dict.set('undefined', undefined)).to.equal(false); + expect(dict.get('undefined')).to.equal(undefined); + + expect(dict.set('undefined', 1)).to.equal(true); + expect(dict.get('undefined')).to.equal(1); + + expect(dict.set('null', null)).to.equal(false); + expect(dict.get('null')).to.equal(undefined); + + expect(dict.set('null', 1)).to.equal(true); + expect(dict.get('null')).to.equal(1); + + dict.clear(); + expect(dict.set(undefined, undefined)).to.equal(false); + expect(dict.get(undefined)).to.equal(undefined); + + expect(dict.set(undefined, 1)).to.equal(false); + expect(dict.get(undefined)).to.equal(undefined); + + expect(dict.set(null, null)).to.equal(false); + expect(dict.get(null)).to.equal(undefined); + + expect(dict.set(null, 1)).to.equal(false); + expect(dict.get(null)).to.equal(undefined); + }); + + it('sets values with string key', () => { + const dict = new Dictionary(); + const min = 1; + const max = 5; + const size = max - min + 1; + + for (let i = min; i <= max; i++) { + expect(dict.set(`${i}`, i)).to.equal(true); + } + expect(dict.size()).to.equal(size); + + const keys = dict.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal((i + 1).toString(10)); + } + + dict.set('a', 1); + expect(dict.get('a')).to.equal(1); + }); + + it('sets values with number key', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + + const keys = dictionary.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal((i + 1)); + } + }); + + it('sets values with object', () => { + const dict = new Dictionary(); + const min = 0; + const max = 5; + const size = max - min; + const myObjList = []; + + for (let i = min; i < max; i++) { + myObjList.push(new MyObj(i, (i + 1))); + } + + for (let i = min; i < max; i++) { + expect(dict.set(myObjList[i], myObjList[i])).to.equal(true); + } + expect(dict.size()).to.equal(size); + + for (let i = min; i < max; i++) { + expect(dict.get(myObjList[i])).to.equal(myObjList[i]); + } + + const keys = dict.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal(myObjList[i]); + } + + const values = dict.values(); + expect(values.length).to.equal(size); + for (let i = 0; i < values.length; i++) { + expect(values[i]).to.equal(myObjList[i]); + } + }); + + function customToString(key: MyObj) { + return `####${key.toString()}`; + } + + it('sets values with custom toString function', () => { + const dict = new Dictionary(customToString); + const min = 0; + const max = 5; + const size = max - min; + const myObjList = []; + + for (let i = min; i < max; i++) { + myObjList.push(new MyObj(i, (i + 1))); + } + + for (let i = min; i < max; i++) { + expect(dict.set(myObjList[i], myObjList[i])).to.equal(true); + } + expect(dict.size()).to.equal(size); + + for (let i = min; i < max; i++) { + expect(dict.get(myObjList[i])).to.equal(myObjList[i]); + } + + const keys = dict.keys(); + expect(keys.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal(myObjList[i]); + } + + const values = dict.values(); + expect(values.length).to.equal(size); + for (let i = 0; i < values.length; i++) { + expect(values[i]).to.equal(myObjList[i]); + } + }); + + it('removes elements', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(dictionary.remove(i)).to.equal(true); + } + + // elements do not exist + for (let i = min; i <= max; i++) { + expect(dictionary.remove(i)).to.equal(false); + } + + expect(dictionary.isEmpty()).to.equal(true); + }); + + it('returns the correct size', () => { + expect(dictionary.size()).to.equal(0); + + const max = 5; + + for (let i = 1; i < max; i++) { + dictionary.set(i, i); + expect(dictionary.size()).to.equal(i); + } + for (let i = 1; i < max; i++) { + dictionary.remove(i); + expect(dictionary.size()).to.equal(max - i - 1); + } + + expect(dictionary.size()).to.equal(0); + expect(dictionary.isEmpty()).to.equal(true); + }); + + it('returns if element exists', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(dictionary.hasKey(i)).to.equal(true); + expect(dictionary.remove(i)).to.equal(true); + expect(dictionary.hasKey(i)).to.equal(false); + } + }); + + it('returns if it is empty', () => { + expect(dictionary.isEmpty()).to.equal(true); + + for (let i = 1; i < 5; i++) { + dictionary.set(i, i); + expect(dictionary.isEmpty()).to.equal(false); + } + + for (let i = 1; i < 5; i++) { + dictionary.remove(i); + expect(dictionary.isEmpty()).to.equal(!(i < 4)); + } + + expect(dictionary.size()).to.equal(0); + expect(dictionary.isEmpty()).to.equal(true); + }); + + it('clears the dictionary', () => { + dictionary.clear(); + expect(dictionary.isEmpty()).to.equal(true); + + dictionary.set(1, 1); + dictionary.set(2, 2); + + dictionary.clear(); + expect(dictionary.isEmpty()).to.equal(true); + }); + + it('returns values, keys and value pairs', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + + for (let i = min; i <= max; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + expect(dictionary.size()).to.equal(size); + + const keys = dictionary.keys(); + const values = dictionary.values(); + const valuePairs = dictionary.keyValues(); + expect(keys.length).to.equal(size); + expect(values.length).to.equal(size); + expect(valuePairs.length).to.equal(size); + for (let i = 0; i < keys.length; i++) { + expect(keys[i]).to.equal((i + 1)); + expect(values[i]).to.equal((i + 1)); + expect(valuePairs[i].key).to.equal((i + 1)); + expect(valuePairs[i].value).to.equal((i + 1)); + } + }); + + it('allows to iterate with forEach', () => { + for (let i = 1; i <= 5; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + + dictionary.forEach((k, v) => { + expect(dictionary.hasKey(k)).to.equal(true); + expect(dictionary.get(k)).to.equal(v); + }); + }); + + it('allows to iterate with forEach and interrupt', () => { + for (let i = 1; i <= 5; i++) { + expect(dictionary.set(i, i)).to.equal(true); + } + + const size = dictionary.keys().length; + + let index = 1; + dictionary.forEach((k, v) => { + expect(dictionary.hasKey(k)).to.equal(true); + expect(dictionary.get(k)).to.equal(v); + index++; + }); + expect(index).to.equal(size + 1); + + index = 1; + dictionary.forEach((k, v) => { + expect(dictionary.hasKey(k)).to.equal(true); + expect(dictionary.get(k)).to.equal(v); + index++; + return !(k % 3 === 0); + }); + expect(index).to.equal(size - 1); + }); + + it('returns toString primitive types', () => { + expect(dictionary.toString()).to.equal(''); + + dictionary.set(1, 1); + expect(dictionary.toString()).to.equal('[#1: 1]'); + + dictionary.set(2, 2); + expect(dictionary.toString()).to.equal('[#1: 1],[#2: 2]'); + + dictionary.clear(); + expect(dictionary.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const dict = new Dictionary(); + dict.set('el1', 1); + expect(dict.toString()).to.equal('[#el1: 1]'); + + dict.set('el2', 2); + expect(dict.toString()).to.equal('[#el1: 1],[#el2: 2]'); + }); + + it('returns toString objects', () => { + const dict = new Dictionary(); + expect(dict.toString()).to.equal(''); + + let myObj = new MyObj(1, 2); + dict.set(myObj, myObj); + expect(dict.toString()).to.equal('[#1|2: 1|2]'); + + myObj = new MyObj(3, 4); + dict.set(myObj, myObj); + expect(dict.toString()).to.equal('[#1|2: 1|2],[#3|4: 3|4]'); + }); + +}); diff --git a/test/ts/data-structures/doubly-linked-list.spec.ts b/test/ts/data-structures/doubly-linked-list.spec.ts new file mode 100644 index 00000000..76abb29a --- /dev/null +++ b/test/ts/data-structures/doubly-linked-list.spec.ts @@ -0,0 +1,406 @@ +import 'mocha'; +import { expect } from 'chai'; +import { DoublyLinkedList } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('DoublyLinkedList', () => { + let list: DoublyLinkedList; + let min: number; + let max: number; + + beforeEach(() => { + list = new DoublyLinkedList(); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = min; i <= max; i++) { + list.push(i); + } + } + + function verifyNode(current: any, i: number) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + + // verify next node + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + // TS strictNullChecks + if (current.next) { + expect(current.next.element).to.equal(i + 1); + } + } else { + expect(current.next).to.be.an('undefined'); + } + + // verify previous node + if (i > min) { + expect(current.prev).to.not.be.an('undefined'); + if (current.prev) { + expect(current.prev.element).to.equal(i - 1); + } + } else { + expect(current.prev).to.be.an('undefined'); + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max; i++) { + expect(current).to.not.be.an('undefined'); + // TS strictNullChecks + if (current) { + verifyNode(current, i); + current = current.next; + } + } + verifyListFromTail(); + } + + function verifyListFromTail() { + let current = list.getTail(); + for (let i = max; i >= min; i--) { + expect(current).to.not.be.an('undefined'); + // TS strictNullChecks + if (current) { + verifyNode(current, i); + current = current.prev; + } + } + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + expect(list.getTail()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max, 0)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + expect(list.insert(1, 1)).to.equal(false); + }); + + it('inserts elements invalid position not empty list', () => { + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(false); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i , i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + for (let i = min; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.getTail()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(1); + expect(current.prev).to.be.an('undefined'); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(3); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(3); + expect(current.next).to.be.an('undefined'); + expect(current.prev).to.not.be.an('undefined'); + if (current.prev) { + expect(current.prev.element).to.equal(1); + } + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the tail of the list', () => { + expect(list.getTail()).to.be.an('undefined'); + + list.push(1); + expect(list.getTail()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new DoublyLinkedList(); + ds.push('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new DoublyLinkedList(); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); + + it('returns inverseToString primitive types', () => { + expect(list.inverseToString()).to.equal(''); + + list.push(1); + expect(list.inverseToString()).to.equal('1'); + + list.push(2); + expect(list.inverseToString()).to.equal('2,1'); + + list.clear(); + expect(list.inverseToString()).to.equal(''); + }); + + it('returns inverseToString primitive types: string', () => { + const ds = new DoublyLinkedList(); + ds.push('el1'); + expect(ds.inverseToString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.inverseToString()).to.equal('el2,el1'); + }); + + it('returns inverseToString objects', () => { + const ds = new DoublyLinkedList(); + expect(ds.inverseToString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.inverseToString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.inverseToString()).to.equal('3|4,1|2'); + }); +}); diff --git a/test/ts/data-structures/hash-table-linear-probing-lazy.spec.ts b/test/ts/data-structures/hash-table-linear-probing-lazy.spec.ts new file mode 100644 index 00000000..7d004349 --- /dev/null +++ b/test/ts/data-structures/hash-table-linear-probing-lazy.spec.ts @@ -0,0 +1,388 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTableLinearProbingLazy } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('HashTableLinearProbingLazy', () => { + const A = 'Jonathan'; + const B = 'Jamie'; + const C = 'Sue'; + + it('starts empty', () => { + const hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + + it('generates hashcode', () => { + // numbers + let hashTable: any = new HashTableLinearProbingLazy(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + + // strings + hashTable = new HashTableLinearProbingLazy(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + + // objects + hashTable = new HashTableLinearProbingLazy(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + + it('puts undefined and null keys and values', () => { + const hashTable = new HashTableLinearProbingLazy(); + + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + + it('puts values with number key without collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableLinearProbingLazy(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + } + }); + + it('puts values with string key without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + + const table = hashTable.getTable(); + + expect(table[12].key).to.equal('1'); + expect(table[12].value).to.equal(1); + + expect(table[23].key).to.equal('10'); + expect(table[23].value).to.equal(10); + + expect(table[34].key).to.equal('100'); + expect(table[34].value).to.equal(100); + + expect(table[8].key).to.equal('1000'); + expect(table[8].value).to.equal(1000); + }); + + it('puts values with object key without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + + const table = hashTable.getTable(); + + expect(table[1].key).to.equal(myObjList[0]); + expect(table[1].value).to.equal(myObjList[0]); + + expect(table[3].key).to.equal(myObjList[1]); + expect(table[3].value).to.equal(myObjList[1]); + + expect(table[5].key).to.equal(myObjList[2]); + expect(table[5].value).to.equal(myObjList[2]); + + expect(table[7].key).to.equal(myObjList[3]); + expect(table[7].value).to.equal(myObjList[3]); + + expect(table[9].key).to.equal(myObjList[4]); + expect(table[9].value).to.equal(myObjList[4]); + }); + + function addValuesCollision() { + const hashTable = new HashTableLinearProbingLazy(); + + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.size()).to.equal(3); + + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + + expect(hashTable.size()).to.equal(3); + + return hashTable; + } + + it('puts values with collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableLinearProbingLazy(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 10)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 2); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 100)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 3); + + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + + expect(table[i + size].key).to.equal(i); + expect(table[i + size].value).to.equal(i + 10); + + expect(table[i + size * 2].key).to.equal(i); + expect(table[i + size * 2].value).to.equal(i + 100); + } + + addValuesCollision(); + }); + + it('removes elements without collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableLinearProbingLazy(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + + expect(hashTable.isEmpty()).to.equal(true); + }); + + function removeWithCollision(a: string, b: string, c: string) { + const hashTable = addValuesCollision(); + + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + + expect(hashTable.isEmpty()).to.equal(true); + } + + it('removes elements with collisions: scenario 1', () => { + // test all possibilities for removal + removeWithCollision(A, B, C); + removeWithCollision(A, C, B); + removeWithCollision(B, A, C); + removeWithCollision(B, C, A); + removeWithCollision(C, A, B); + removeWithCollision(C, B, A); + }); + + function addValuesCollision2() { + const hashTable = new HashTableLinearProbingLazy(); + + expect(hashTable.put(')', `parenthesis@email.com`)).to.equal(true); + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put('+', `plus@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(',', `comma@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.put('-', `minus@email.com`)).to.equal(true); + expect(hashTable.put('0', `zero@email.com`)).to.equal(true); + + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + expect(hashTable.hashCode(')')).to.equal(4); + expect(hashTable.hashCode('+')).to.equal(6); + expect(hashTable.hashCode(',')).to.equal(7); + expect(hashTable.hashCode('-')).to.equal(8); + expect(hashTable.hashCode('0')).to.equal(11); + + expect(hashTable.size()).to.equal(8); + + const table = hashTable.getTable(); + expect(table[4].key).to.equal(')'); + expect(table[5].key).to.equal(A); + expect(table[6].key).to.equal('+'); + expect(table[7].key).to.equal(B); + expect(table[8].key).to.equal(','); + expect(table[9].key).to.equal(C); + expect(table[10].key).to.equal('-'); + expect(table[11].key).to.equal('0'); + + return hashTable; + } + + function verifyOtherKeys(hashTable: HashTableLinearProbingLazy) { + expect(hashTable.get(')')).to.not.equal(undefined); + expect(hashTable.get('+')).to.not.equal(undefined); + expect(hashTable.get(',')).to.not.equal(undefined); + expect(hashTable.get('-')).to.not.equal(undefined); + expect(hashTable.get('0')).to.not.equal(undefined); + } + + function removeWithCollision2(a: string, b: string, c: string) { + const hashTable = addValuesCollision2(); + + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + verifyOtherKeys(hashTable); + } + + it('removes elements with collisions: scenario 2', () => { + // test all possibilities for removal + removeWithCollision2(A, B, C); + removeWithCollision2(A, C, B); + removeWithCollision2(B, A, C); + removeWithCollision2(B, C, A); + removeWithCollision2(C, A, B); + removeWithCollision2(C, B, A); + }); + + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + + expect(hashTable.toString()).to.equal(''); + + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + + it('returns toString objects without collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal( + '{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}' + ); + }); + + it('returns toString with collisions', () => { + const hashTable = new HashTableLinearProbingLazy(); + + expect(hashTable.toString()).to.equal(''); + + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + + hashTable.put(1, 10); + expect(hashTable.toString()).to.equal( + '{1 => [#1: 1]},{2 => [#2: 2]},{3 => [#1: 10]}' + ); + + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); +}); diff --git a/test/ts/data-structures/hash-table-linear-probing.spec.ts b/test/ts/data-structures/hash-table-linear-probing.spec.ts new file mode 100644 index 00000000..77ed340f --- /dev/null +++ b/test/ts/data-structures/hash-table-linear-probing.spec.ts @@ -0,0 +1,388 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTableLinearProbing } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('HashTableLinearProbing', () => { + const A = 'Jonathan'; + const B = 'Jamie'; + const C = 'Sue'; + + it('starts empty', () => { + const hashTable = new HashTableLinearProbing(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + + it('generates hashcode', () => { + // numbers + let hashTable: any = new HashTableLinearProbing(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + + // strings + hashTable = new HashTableLinearProbing(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + + // objects + hashTable = new HashTableLinearProbing(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + + it('puts undefined and null keys and values', () => { + const hashTable = new HashTableLinearProbing(); + + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + + it('puts values with number key without collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableLinearProbing(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + } + }); + + it('puts values with string key without collisions', () => { + const hashTable = new HashTableLinearProbing(); + + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + + const table = hashTable.getTable(); + + expect(table[12].key).to.equal('1'); + expect(table[12].value).to.equal(1); + + expect(table[23].key).to.equal('10'); + expect(table[23].value).to.equal(10); + + expect(table[34].key).to.equal('100'); + expect(table[34].value).to.equal(100); + + expect(table[8].key).to.equal('1000'); + expect(table[8].value).to.equal(1000); + }); + + it('puts values with object key without collisions', () => { + const hashTable = new HashTableLinearProbing(); + + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + + const table = hashTable.getTable(); + + expect(table[1].key).to.equal(myObjList[0]); + expect(table[1].value).to.equal(myObjList[0]); + + expect(table[3].key).to.equal(myObjList[1]); + expect(table[3].value).to.equal(myObjList[1]); + + expect(table[5].key).to.equal(myObjList[2]); + expect(table[5].value).to.equal(myObjList[2]); + + expect(table[7].key).to.equal(myObjList[3]); + expect(table[7].value).to.equal(myObjList[3]); + + expect(table[9].key).to.equal(myObjList[4]); + expect(table[9].value).to.equal(myObjList[4]); + }); + + function addValuesCollision() { + const hashTable = new HashTableLinearProbing(); + + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.size()).to.equal(3); + + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + + expect(hashTable.size()).to.equal(3); + + return hashTable; + } + + it('puts values with collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableLinearProbing(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 10)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 2); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 100)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 3); + + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + + expect(table[i + size].key).to.equal(i); + expect(table[i + size].value).to.equal(i + 10); + + expect(table[i + size * 2].key).to.equal(i); + expect(table[i + size * 2].value).to.equal(i + 100); + } + + addValuesCollision(); + }); + + it('removes elements without collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableLinearProbing(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + + expect(hashTable.isEmpty()).to.equal(true); + }); + + function removeWithCollision(a: string, b: string, c: string) { + const hashTable = addValuesCollision(); + + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + + expect(hashTable.isEmpty()).to.equal(true); + } + + it('removes elements with collisions: scenario 1', () => { + // test all possibilities for removal + removeWithCollision(A, B, C); + removeWithCollision(A, C, B); + removeWithCollision(B, A, C); + removeWithCollision(B, C, A); + removeWithCollision(C, A, B); + removeWithCollision(C, B, A); + }); + + function addValuesCollision2() { + const hashTable = new HashTableLinearProbing(); + + expect(hashTable.put(')', `parenthesis@email.com`)).to.equal(true); + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put('+', `plus@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(',', `comma@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.put('-', `minus@email.com`)).to.equal(true); + expect(hashTable.put('0', `zero@email.com`)).to.equal(true); + + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + expect(hashTable.hashCode(')')).to.equal(4); + expect(hashTable.hashCode('+')).to.equal(6); + expect(hashTable.hashCode(',')).to.equal(7); + expect(hashTable.hashCode('-')).to.equal(8); + expect(hashTable.hashCode('0')).to.equal(11); + + expect(hashTable.size()).to.equal(8); + + const table = hashTable.getTable(); + expect(table[4].key).to.equal(')'); + expect(table[5].key).to.equal(A); + expect(table[6].key).to.equal('+'); + expect(table[7].key).to.equal(B); + expect(table[8].key).to.equal(','); + expect(table[9].key).to.equal(C); + expect(table[10].key).to.equal('-'); + expect(table[11].key).to.equal('0'); + + return hashTable; + } + + function verifyOtherKeys(hashTable: HashTableLinearProbing) { + expect(hashTable.get(')')).to.not.equal(undefined); + expect(hashTable.get('+')).to.not.equal(undefined); + expect(hashTable.get(',')).to.not.equal(undefined); + expect(hashTable.get('-')).to.not.equal(undefined); + expect(hashTable.get('0')).to.not.equal(undefined); + } + + function removeWithCollision2(a: string, b: string, c: string) { + const hashTable = addValuesCollision2(); + + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + verifyOtherKeys(hashTable); + + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + verifyOtherKeys(hashTable); + } + + it('removes elements with collisions: scenario 2', () => { + // test all possibilities for removal + removeWithCollision2(A, B, C); + removeWithCollision2(A, C, B); + removeWithCollision2(B, A, C); + removeWithCollision2(B, C, A); + removeWithCollision2(C, A, B); + removeWithCollision2(C, B, A); + }); + + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbing(); + + expect(hashTable.toString()).to.equal(''); + + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableLinearProbing(); + + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + + it('returns toString objects without collisions', () => { + const hashTable = new HashTableLinearProbing(); + + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal( + '{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}' + ); + }); + + it('returns toString with collisions', () => { + const hashTable = new HashTableLinearProbing(); + + expect(hashTable.toString()).to.equal(''); + + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + + hashTable.put(1, 10); + expect(hashTable.toString()).to.equal( + '{1 => [#1: 1]},{2 => [#2: 2]},{3 => [#1: 10]}' + ); + + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); +}); diff --git a/test/ts/data-structures/hash-table-separate-chaining.spec.ts b/test/ts/data-structures/hash-table-separate-chaining.spec.ts new file mode 100644 index 00000000..b7f72524 --- /dev/null +++ b/test/ts/data-structures/hash-table-separate-chaining.spec.ts @@ -0,0 +1,343 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTableSeparateChaining } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('HashTableSeparateChaining', () => { + const A = 'Jonathan'; + const B = 'Jamie'; + const C = 'Sue'; + + it('starts empty', () => { + const hashTable = new HashTableSeparateChaining(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + + it('generates hashcode', () => { + // numbers + let hashTable: any = new HashTableSeparateChaining(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + + // strings + hashTable = new HashTableSeparateChaining(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + + // objects + hashTable = new HashTableSeparateChaining(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + + it('puts undefined and null keys and values', () => { + const hashTable = new HashTableSeparateChaining(); + + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + + it('puts values with number key without collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableSeparateChaining(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + const linkedList = table[i]; + expect(linkedList.size()).to.equal(1); + const valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i); + } + }); + + it('puts values with string key without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + + const table = hashTable.getTable(); + + let linkedList = table[12]; + expect(linkedList.size()).to.equal(1); + let valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('1'); + expect(valuePair.element.value).to.equal(1); + + linkedList = table[23]; + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('10'); + expect(valuePair.element.value).to.equal(10); + + linkedList = table[34]; + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('100'); + expect(valuePair.element.value).to.equal(100); + + linkedList = table[8]; + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal('1000'); + expect(valuePair.element.value).to.equal(1000); + }); + + it('puts values with object key without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + + const table = hashTable.getTable(); + + let linkedList = table[1]; + expect(linkedList.size()).to.equal(1); + let valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[0]); + expect(valuePair.element.value).to.equal(myObjList[0]); + + linkedList = table[3]; + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[1]); + expect(valuePair.element.value).to.equal(myObjList[1]); + + linkedList = table[5]; + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[2]); + expect(valuePair.element.value).to.equal(myObjList[2]); + + linkedList = table[7]; + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[3]); + expect(valuePair.element.value).to.equal(myObjList[3]); + + linkedList = table[9]; + expect(linkedList.size()).to.equal(1); + valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(myObjList[4]); + expect(valuePair.element.value).to.equal(myObjList[4]); + }); + + it('puts values with collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableSeparateChaining(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 10)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 2); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i + 100)).to.equal(true); + } + expect(hashTable.size()).to.equal(size * 3); + + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + const linkedList = table[i]; + expect(linkedList.size()).to.equal(3); + + let valuePair = linkedList.getHead(); + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i); + + valuePair = valuePair.next; + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i + 10); + + valuePair = valuePair.next; + expect(valuePair.element.key).to.equal(i); + expect(valuePair.element.value).to.equal(i + 100); + } + }); + + it('removes elements without collisions', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTableSeparateChaining(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + + expect(hashTable.isEmpty()).to.equal(true); + }); + + function addValuesCollision() { + const hashTable = new HashTableSeparateChaining(); + + expect(hashTable.put(A, `${A}@email.com`)).to.equal(true); + expect(hashTable.put(B, `${B}@email.com`)).to.equal(true); + expect(hashTable.put(C, `${C}@email.com`)).to.equal(true); + expect(hashTable.size()).to.equal(3); + + const expectedHash = 5; + expect(hashTable.hashCode(A)).to.equal(expectedHash); + expect(hashTable.hashCode(B)).to.equal(expectedHash); + expect(hashTable.hashCode(C)).to.equal(expectedHash); + + expect(hashTable.getTable()[expectedHash].size()).to.equal(3); + + return hashTable; + } + + function removeWithCollision(a: string, b: string, c: string) { + const hashTable = addValuesCollision(); + + expect(hashTable.remove(a)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.not.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + + expect(hashTable.remove(b)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.not.equal(undefined); + + expect(hashTable.remove(c)).to.equal(true); + expect(hashTable.get(a)).to.equal(undefined); + expect(hashTable.get(b)).to.equal(undefined); + expect(hashTable.get(c)).to.equal(undefined); + + expect(hashTable.isEmpty()).to.equal(true); + } + + it('removes elements with collisions', () => { + // test all possibilities for removal + removeWithCollision(A, B, C); + removeWithCollision(A, C, B); + removeWithCollision(B, A, C); + removeWithCollision(B, C, A); + removeWithCollision(C, A, B); + removeWithCollision(C, B, A); + }); + + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + + expect(hashTable.toString()).to.equal(''); + + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + + it('returns toString primitive types without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + + it('returns toString objects without collisions', () => { + const hashTable = new HashTableSeparateChaining(); + + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal( + '{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}' + ); + }); + + it('returns toString with collisions', () => { + const hashTable = new HashTableSeparateChaining(); + + expect(hashTable.toString()).to.equal(''); + + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + + hashTable.put(1, 10); + expect(hashTable.toString()).to.equal('{1 => [#1: 1],[#1: 10]},{2 => [#2: 2]}'); + + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); +}); diff --git a/test/ts/data-structures/hash-table.spec.ts b/test/ts/data-structures/hash-table.spec.ts new file mode 100644 index 00000000..2dd56a3f --- /dev/null +++ b/test/ts/data-structures/hash-table.spec.ts @@ -0,0 +1,211 @@ +import 'mocha'; +import { expect } from 'chai'; +import { HashTable } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('HashTable', () => { + it('starts empty', () => { + const hashTable = new HashTable(); + expect(hashTable.size()).to.equal(0); + expect(hashTable.isEmpty()).to.equal(true); + }); + + it('generates hashcode', () => { + // numbers + let hashTable: any = new HashTable(); + expect(hashTable.hashCode(1)).to.equal(1); + expect(hashTable.hashCode(10)).to.equal(10); + expect(hashTable.hashCode(100)).to.equal(100); + expect(hashTable.hashCode(1000)).to.equal(1000); + + // strings + hashTable = new HashTable(); + expect(hashTable.hashCode('1')).to.equal(12); + expect(hashTable.hashCode('10')).to.equal(23); + expect(hashTable.hashCode('100')).to.equal(34); + expect(hashTable.hashCode('1000')).to.equal(8); + expect(hashTable.hashCode('a')).to.equal(23); + expect(hashTable.hashCode('A')).to.equal(28); + expect(hashTable.hashCode('Aba')).to.equal(1); + + // objects + hashTable = new HashTable(); + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + } + expect(hashTable.hashCode(myObjList[0])).to.equal(1); + expect(hashTable.hashCode(myObjList[1])).to.equal(3); + expect(hashTable.hashCode(myObjList[2])).to.equal(5); + expect(hashTable.hashCode(myObjList[3])).to.equal(7); + expect(hashTable.hashCode(myObjList[4])).to.equal(9); + }); + + it('puts undefined and null keys and values', () => { + const hashTable = new HashTable(); + + expect(hashTable.put('undefined', undefined)).to.equal(false); + expect(hashTable.get('undefined')).to.equal(undefined); + + expect(hashTable.put('undefined', 1)).to.equal(true); + expect(hashTable.get('undefined')).to.equal(1); + + expect(hashTable.put('null', null)).to.equal(false); + expect(hashTable.get('null')).to.equal(undefined); + + expect(hashTable.put('null', 1)).to.equal(true); + expect(hashTable.get('null')).to.equal(1); + + hashTable.clear(); + expect(hashTable.put(undefined, undefined)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(undefined, 1)).to.equal(false); + expect(hashTable.get(undefined)).to.equal(undefined); + + expect(hashTable.put(null, null)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + + expect(hashTable.put(null, 1)).to.equal(false); + expect(hashTable.get(null)).to.equal(undefined); + }); + + it('puts values with number key', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTable(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + const table = hashTable.getTable(); + for (let i = min; i <= max; i++) { + expect(table[i].key).to.equal(i); + expect(table[i].value).to.equal(i); + } + }); + + it('puts values with string key', () => { + const hashTable = new HashTable(); + + expect(hashTable.put('1', 1)).to.equal(true); + expect(hashTable.put('10', 10)).to.equal(true); + expect(hashTable.put('100', 100)).to.equal(true); + expect(hashTable.put('1000', 1000)).to.equal(true); + + const table = hashTable.getTable(); + + expect(table[12].key).to.equal('1'); + expect(table[12].value).to.equal(1); + + expect(table[23].key).to.equal('10'); + expect(table[23].value).to.equal(10); + + expect(table[34].key).to.equal('100'); + expect(table[34].value).to.equal(100); + + expect(table[8].key).to.equal('1000'); + expect(table[8].value).to.equal(1000); + }); + + it('puts values with object key', () => { + const hashTable = new HashTable(); + + const myObjList = []; + for (let i = 1; i <= 5; i++) { + myObjList.push(new MyObj(i, i + 1)); + expect(hashTable.put(myObjList[i - 1], myObjList[i - 1])).to.equal(true); + } + + const table = hashTable.getTable(); + + expect(table[1].key).to.equal(myObjList[0]); + expect(table[1].value).to.equal(myObjList[0]); + + expect(table[3].key).to.equal(myObjList[1]); + expect(table[3].value).to.equal(myObjList[1]); + + expect(table[5].key).to.equal(myObjList[2]); + expect(table[5].value).to.equal(myObjList[2]); + + expect(table[7].key).to.equal(myObjList[3]); + expect(table[7].value).to.equal(myObjList[3]); + + expect(table[9].key).to.equal(myObjList[4]); + expect(table[9].value).to.equal(myObjList[4]); + }); + + it('does NOT handle collision, replaces values', () => { + const hashTable = new HashTable(); + + for (let i = 0; i < 5; i++) { + expect(hashTable.put(1, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(1); + }); + + it('removes elements', () => { + const min = 1; + const max = 5; + const size = max - min + 1; + const hashTable = new HashTable(); + + for (let i = min; i <= max; i++) { + expect(hashTable.put(i, i)).to.equal(true); + } + expect(hashTable.size()).to.equal(size); + + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(true); + } + + // elements do not exist + for (let i = min; i <= max; i++) { + expect(hashTable.remove(i)).to.equal(false); + } + + expect(hashTable.isEmpty()).to.equal(true); + }); + + it('returns toString primitive types', () => { + const hashTable = new HashTable(); + + expect(hashTable.toString()).to.equal(''); + + hashTable.put(1, 1); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]}'); + + hashTable.put(2, 2); + expect(hashTable.toString()).to.equal('{1 => [#1: 1]},{2 => [#2: 2]}'); + + hashTable.clear(); + expect(hashTable.toString()).to.equal(''); + }); + + it('returns toString primitive types', () => { + const hashTable = new HashTable(); + + hashTable.put('el1', 1); + expect(hashTable.toString()).to.equal('{36 => [#el1: 1]}'); + + hashTable.put('el2', 2); + expect(hashTable.toString()).to.equal('{0 => [#el2: 2]},{36 => [#el1: 1]}'); + }); + + it('returns toString objects', () => { + const hashTable = new HashTable(); + + let myObj = new MyObj(1, 2); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal('{1 => [#1|2: 1|2]}'); + + myObj = new MyObj(3, 4); + hashTable.put(myObj, myObj); + expect(hashTable.toString()).to.equal( + '{1 => [#1|2: 1|2]},{5 => [#3|4: 3|4]}' + ); + }); +}); diff --git a/test/ts/data-structures/heap.spec.ts b/test/ts/data-structures/heap.spec.ts new file mode 100644 index 00000000..6a543fcd --- /dev/null +++ b/test/ts/data-structures/heap.spec.ts @@ -0,0 +1,75 @@ +import 'mocha'; +import { expect } from 'chai'; +import { MinHeap, heapSort } from '../../../src/ts/index'; + +describe('Heap', () => { + let heap: MinHeap; + + beforeEach(() => { + heap = new MinHeap(); + }); + + it('starts empty MinHeap', () => { + expect(heap.size()).to.equal(0); + expect(heap.isEmpty()).to.equal(true); + }); + + it('inserts values in the MinHeap', () => { + const resultArray = []; + for (let i = 1; i < 10; i++) { + resultArray.push(i); + heap.insert(i); + expect(heap.getAsArray()).to.deep.equal(resultArray); + } + }); + + it('finds the min value from the MinHeap', () => { + const resultArray = []; + for (let i = 10; i >= 1; i--) { + resultArray.push(i); + heap.insert(i); + expect(heap.findMinimum()).to.equal(i); + } + }); + + it('performs heapify in the MinHeap', () => { + const resultArray = []; + for (let i = 10; i >= 1; i--) { + resultArray.push(i); + } + expect(heap.heapify(resultArray)).to.deep.equal(resultArray); + }); + + it('extracts the min value from the MinHeap', () => { + let resultArray = []; + for (let i = 1; i < 10; i++) { + resultArray.push(i); + heap.insert(i); + expect(heap.getAsArray()).to.deep.equal(resultArray); + } + + resultArray = [ + [], + [2, 4, 3, 8, 5, 6, 7, 9], + [3, 4, 6, 8, 5, 9, 7], + [4, 5, 6, 8, 7, 9], + [5, 7, 6, 8, 9], + [6, 7, 9, 8], + [7, 8, 9], + [8, 9], + [9], + [] + ]; + + for (let i = 1; i < 10; i++) { + expect(heap.extract()).to.equal(i); + expect(heap.getAsArray()).to.deep.equal(resultArray[i]); + } + }); + + it('Heap Sort', () => { + const array = [3, 2, 5, 6, 1, 7, 8, 9]; + + expect(heapSort(array)).to.deep.equal([1, 2, 3, 5, 6, 7, 8, 9]); + }); +}); diff --git a/test/ts/data-structures/linked-list.spec.ts b/test/ts/data-structures/linked-list.spec.ts new file mode 100644 index 00000000..116abbd9 --- /dev/null +++ b/test/ts/data-structures/linked-list.spec.ts @@ -0,0 +1,330 @@ +import 'mocha'; +import { expect } from 'chai'; +import { LinkedList, util } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('LinkedList', () => { + let list: LinkedList; + let min: number; + let max: number; + + beforeEach(() => { + list = new LinkedList(util.defaultEquals); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = min; i <= max; i++) { + list.push(i); + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max && current; i++) { + expect(current).to.not.be.an('undefined'); + if (current) { + // TS strictNullChecks + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + // TS strictNullChecks + expect(current.next.element).to.equal(i + 1); + } + } else { + expect(current.next).to.be.an('undefined'); + } + current = current.next; + } + } + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max, 0)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + expect(list.insert(1, 1)).to.equal(false); + }); + + it('inserts elements invalid position not empty list', () => { + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(false); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i , i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + for (let i = min; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + } + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(1); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(3); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(3); + expect(current.next).to.be.an('undefined'); + } + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new LinkedList(); + ds.push('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.push('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new LinkedList(); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/ts/data-structures/my-obj.ts b/test/ts/data-structures/my-obj.ts new file mode 100644 index 00000000..ff633f2b --- /dev/null +++ b/test/ts/data-structures/my-obj.ts @@ -0,0 +1,7 @@ +export default class MyObj { + constructor(public el1: any, public el2: any) { } + toString() { + return `${this.el1.toString()}|${this.el2.toString()}`; + } +} + diff --git a/test/ts/data-structures/queue.spec.ts b/test/ts/data-structures/queue.spec.ts new file mode 100644 index 00000000..132f7280 --- /dev/null +++ b/test/ts/data-structures/queue.spec.ts @@ -0,0 +1,168 @@ +import 'mocha'; +import { expect } from 'chai'; +import Queue from '../../../src/ts/data-structures/queue'; + +describe('Queue', () => { + let queue: Queue; + + beforeEach(() => { + queue = new Queue(); + }); + + it('starts empty', () => { + expect(queue.size()).to.equal(0); + expect(queue.isEmpty()).to.equal(true); + }); + + it('enqueues elements', () => { + queue.enqueue(1); + expect(queue.size()).to.equal(1); + queue.enqueue(2); + expect(queue.size()).to.equal(2); + queue.enqueue(3); + expect(queue.size()).to.equal(3); + + expect(queue.isEmpty()).to.equal(false); + }); + + it('dequeue elements', () => { + queue.enqueue(1); + queue.enqueue(2); + queue.enqueue(3); + + expect(queue.dequeue()).to.equal(1); + expect(queue.dequeue()).to.equal(2); + expect(queue.dequeue()).to.equal(3); + expect(queue.dequeue()).to.equal(undefined); + }); + + it('implements FIFO logic', () => { + queue.enqueue(1); + expect(queue.peek()).to.equal(1); + queue.enqueue(2); + expect(queue.peek()).to.equal(1); + queue.enqueue(3); + expect(queue.peek()).to.equal(1); + + expect(queue.dequeue()).to.equal(1); + expect(queue.dequeue()).to.equal(2); + expect(queue.dequeue()).to.equal(3); + expect(queue.dequeue()).to.equal(undefined); + }); + + it('allows to peek at the front element in the queue without dequeuing it', () => { + expect(queue.peek()).to.equal(undefined); + + queue.enqueue(1); + expect(queue.peek()).to.equal(1); + + queue.enqueue(2); + expect(queue.peek()).to.equal(1); + + queue.dequeue(); + expect(queue.peek()).to.equal(2); + }); + + it('returns the correct size', () => { + expect(queue.size()).to.equal(0); + queue.enqueue(1); + expect(queue.size()).to.equal(1); + queue.enqueue(2); + expect(queue.size()).to.equal(2); + queue.enqueue(3); + expect(queue.size()).to.equal(3); + + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + + queue.enqueue(1); + queue.enqueue(2); + queue.enqueue(3); + expect(queue.size()).to.equal(3); + + queue.dequeue(); + expect(queue.size()).to.equal(2); + queue.dequeue(); + expect(queue.size()).to.equal(1); + queue.dequeue(); + expect(queue.size()).to.equal(0); + queue.dequeue(); + expect(queue.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(queue.isEmpty()).to.equal(true); + queue.enqueue(1); + expect(queue.isEmpty()).to.equal(false); + queue.enqueue(2); + expect(queue.isEmpty()).to.equal(false); + queue.enqueue(3); + expect(queue.isEmpty()).to.equal(false); + + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + + queue.enqueue(1); + queue.enqueue(2); + queue.enqueue(3); + expect(queue.isEmpty()).to.equal(false); + + queue.dequeue(); + expect(queue.isEmpty()).to.equal(false); + queue.dequeue(); + expect(queue.isEmpty()).to.equal(false); + queue.dequeue(); + expect(queue.isEmpty()).to.equal(true); + queue.dequeue(); + expect(queue.isEmpty()).to.equal(true); + }); + + it('clears the queue', () => { + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + + queue.enqueue(1); + queue.enqueue(2); + expect(queue.isEmpty()).to.equal(false); + + queue.clear(); + expect(queue.isEmpty()).to.equal(true); + }); + + it('returns toString primitive types', () => { + expect(queue.toString()).to.equal(''); + + queue.enqueue(1); + expect(queue.toString()).to.equal('1'); + + queue.enqueue(2); + expect(queue.toString()).to.equal('1,2'); + + queue.clear(); + expect(queue.toString()).to.equal(''); + + const queueString = new Queue(); + queueString.enqueue('el1'); + expect(queueString.toString()).to.equal('el1'); + + queueString.enqueue('el2'); + expect(queueString.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + class MyObj { + constructor(public el1: any, public el2: any) {} + toString() { + return `${this.el1.toString()}|${this.el2.toString()}`; + } + } + const queueMyObj = new Queue(); + expect(queueMyObj.toString()).to.equal(''); + + queueMyObj.enqueue(new MyObj(1, 2)); + expect(queueMyObj.toString()).to.equal('1|2'); + + queueMyObj.enqueue(new MyObj(3, 4)); + expect(queueMyObj.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/ts/data-structures/red-black-tree.spec.ts b/test/ts/data-structures/red-black-tree.spec.ts new file mode 100644 index 00000000..d5091f86 --- /dev/null +++ b/test/ts/data-structures/red-black-tree.spec.ts @@ -0,0 +1,113 @@ +import { Colors } from './../../../src/ts/data-structures/models/red-black-node'; +import 'mocha'; +import { expect } from 'chai'; +import { RedBlackTree } from '../../../src/ts/index'; +import { RedBlackNode } from '../../../src/ts/data-structures/models/red-black-node'; + +describe('RedBlackTree', () => { + let tree: RedBlackTree; + + beforeEach(() => { + tree = new RedBlackTree(); + }); + + it('starts empty', () => { + expect(tree.getRoot()).to.equal(undefined); + }); + + it('inserts elements in the RedBlackTree', () => { + expect(tree.getRoot()).to.equal(undefined); + + let node; + + tree.insert(1); + assertNode(tree.getRoot(), 1, Colors.BLACK); + + tree.insert(2); + assertNode(tree.getRoot(), 1, Colors.BLACK); + assertNode(tree.getRoot().right, 2, Colors.RED); + + tree.insert(3); + assertNode(tree.getRoot(), 2, Colors.BLACK); + assertNode(tree.getRoot().right, 3, Colors.RED); + assertNode(tree.getRoot().left, 1, Colors.RED); + + tree.insert(4); + assertNode(tree.getRoot(), 2, Colors.BLACK); + assertNode(tree.getRoot().left, 1, Colors.BLACK); + assertNode(tree.getRoot().right, 3, Colors.BLACK); + assertNode(tree.getRoot().right.right, 4, Colors.RED); + + tree.insert(5); + assertNode(tree.getRoot(), 2, Colors.BLACK); + assertNode(tree.getRoot().left, 1, Colors.BLACK); + node = tree.getRoot().right; + assertNode(node, 4, Colors.BLACK); + assertNode(node.left, 3, Colors.RED); + assertNode(node.right, 5, Colors.RED); + + tree.insert(6); + assertNode(tree.getRoot(), 2, Colors.BLACK); + assertNode(tree.getRoot().left, 1, Colors.BLACK); + node = tree.getRoot().right; + assertNode(node, 4, Colors.RED); + assertNode(node.left, 3, Colors.BLACK); + assertNode(node.right, 5, Colors.BLACK); + assertNode(node.right.right, 6, Colors.RED); + + tree.insert(7); + assertNode(tree.getRoot(), 2, Colors.BLACK); + assertNode(tree.getRoot().left, 1, Colors.BLACK); + node = tree.getRoot().right; + assertNode(node, 4, Colors.RED); + assertNode(node.left, 3, Colors.BLACK); + assertNode(node.right, 6, Colors.BLACK); + assertNode(node.right.right, 7, Colors.RED); + assertNode(node.right.left, 5, Colors.RED); + + tree.insert(8); + assertNode(tree.getRoot(), 4, Colors.BLACK); + node = tree.getRoot().left; + assertNode(node, 2, Colors.RED); + assertNode(node.left, 1, Colors.BLACK); + assertNode(node.right, 3, Colors.BLACK); + node = tree.getRoot().right; + assertNode(node, 6, Colors.RED); + assertNode(node.left, 5, Colors.BLACK); + assertNode(node.right, 7, Colors.BLACK); + assertNode(node.right.right, 8, Colors.RED); + + tree.insert(9); + assertNode(tree.getRoot(), 4, Colors.BLACK); + node = tree.getRoot().left; + assertNode(node, 2, Colors.RED); + assertNode(node.left, 1, Colors.BLACK); + assertNode(node.right, 3, Colors.BLACK); + node = tree.getRoot().right; + assertNode(node, 6, Colors.RED); + assertNode(node.left, 5, Colors.BLACK); + assertNode(node.right, 8, Colors.BLACK); + assertNode(node.right.left, 7, Colors.RED); + assertNode(node.right.right, 9, Colors.RED); + + tree.insert(10); + assertNode(tree.getRoot(), 4, Colors.BLACK); + node = tree.getRoot().left; + assertNode(node, 2, Colors.BLACK); + assertNode(node.left, 1, Colors.BLACK); + assertNode(node.right, 3, Colors.BLACK); + node = tree.getRoot().right; + assertNode(node, 6, Colors.BLACK); + assertNode(node.left, 5, Colors.BLACK); + assertNode(node.right, 8, Colors.RED); + assertNode(node.right.left, 7, Colors.BLACK); + assertNode(node.right.right, 9, Colors.BLACK); + assertNode(node.right.right.right, 10, Colors.RED); + + }); + + function assertNode(node: RedBlackNode, key: number, color: Colors) { + expect(node.color).to.equal(color); + expect(node.key).to.equal(key); + } +}); diff --git a/test/ts/data-structures/set.spec.ts b/test/ts/data-structures/set.spec.ts new file mode 100644 index 00000000..7320cdfc --- /dev/null +++ b/test/ts/data-structures/set.spec.ts @@ -0,0 +1,352 @@ +import 'mocha'; +import { expect } from 'chai'; +import { Set } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('Set', () => { + let set: Set; + + beforeEach(() => { + set = new Set(); + }); + + it('starts empty', () => { + expect(set.size()).to.equal(0); + expect(set.isEmpty()).to.equal(true); + }); + + it('adds elements', () => { + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.size()).to.equal(i); + } + + expect(set.isEmpty()).to.equal(false); + }); + + it('does not allow duplicated elements', () => { + let expected = true; + for (let i = 1; i < 5; i++) { + expect(set.add(i)).to.equal(expected); + } + + expected = false; + for (let i = 1; i < 5; i++) { + expect(set.add(i)).to.equal(expected); + } + }); + + it('deletes elements', () => { + for (let i = 1; i < 5; i++) { + set.add(i); + } + + for (let i = 1; i < 5; i++) { + expect(set.delete(i)).to.equal(true); + } + + // elements do not exist + for (let i = 1; i < 5; i++) { + expect(set.delete(i)).to.equal(false); + } + + expect(set.isEmpty()).to.equal(true); + }); + + it('returns if element exists', () => { + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.has(i)).to.equal(true); + } + + for (let i = 1; i < 5; i++) { + expect(set.delete(i)).to.equal(true); + expect(set.has(i)).to.equal(false); + } + }); + + it('returns the correct size', () => { + expect(set.size()).to.equal(0); + + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.size()).to.equal(i); + } + + const max = 5; + for (let i = 1; i < max; i++) { + set.delete(i); + expect(set.size()).to.equal(max - i - 1); + } + + expect(set.size()).to.equal(0); + expect(set.isEmpty()).to.equal(true); + }); + + it('returns if it is empty', () => { + expect(set.isEmpty()).to.equal(true); + + for (let i = 1; i < 5; i++) { + set.add(i); + expect(set.isEmpty()).to.equal(false); + } + + for (let i = 1; i < 5; i++) { + set.delete(i); + expect(set.isEmpty()).to.equal(!(i < 4)); + } + + expect(set.size()).to.equal(0); + expect(set.isEmpty()).to.equal(true); + }); + + it('clears the set', () => { + set.clear(); + expect(set.isEmpty()).to.equal(true); + + set.add(1); + set.add(2); + + set.clear(); + expect(set.isEmpty()).to.equal(true); + }); + + function addValues(min: number, max: number) { + set = new Set(); + + for (let i = min; i <= max; i++) { + set.add(i); + } + + return set; + } + + it('union between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + let setResult = set1.union(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.union(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('union between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + let setResult = set1.union(set2); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.union(set1); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('union between different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + let setResult = set1.union(set2); + for (let i = 1; i <= 10; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.union(set1); + for (let i = 1; i <= 10; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('union between sets with common values', () => { + const set1 = addValues(1, 5); + const set2 = addValues(3, 6); + + let setResult = set1.union(set2); + for (let i = 1; i <= 6; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.union(set1); + for (let i = 1; i <= 6; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('intersection between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + let setResult = set1.intersection(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.intersection(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('intersection between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + let setResult = set1.intersection(set2); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.intersection(set1); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('intersection different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + let setResult = set1.intersection(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.intersection(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('intersection between sets with common values', () => { + const set1 = addValues(1, 5); + const set2 = addValues(3, 6); + + let setResult = set1.intersection(set2); + for (let i = 3; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.intersection(set1); + for (let i = 3; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('difference between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + let setResult = set1.difference(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.difference(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('difference between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + let setResult = set1.difference(set2); + expect(setResult.isEmpty()).to.equal(true); + + setResult = set2.difference(set1); + expect(setResult.isEmpty()).to.equal(true); + }); + + it('difference different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + let setResult = set1.difference(set2); + for (let i = 1; i <= 5; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.difference(set1); + for (let i = 6; i <= 10; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('difference between sets with common values', () => { + const set1 = addValues(1, 5); + const set2 = addValues(3, 6); + + let setResult = set1.difference(set2); + for (let i = 1; i <= 2; i++) { + expect(setResult.has(i)).to.equal(true); + } + + setResult = set2.difference(set1); + for (let i = 6; i <= 6; i++) { + expect(setResult.has(i)).to.equal(true); + } + }); + + it('isSubsetOf between empty sets', () => { + const set1 = new Set(); + const set2 = new Set(); + + expect(set1.isSubsetOf(set2)).to.equal(true); + expect(set2.isSubsetOf(set1)).to.equal(true); + }); + + it('isSubsetOf between equal sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(1, 5); + + expect(set1.isSubsetOf(set2)).to.equal(true); + expect(set2.isSubsetOf(set1)).to.equal(true); + }); + + it('isSubsetOf different sets', () => { + const set1 = addValues(1, 5); + const set2 = addValues(6, 10); + + expect(set1.isSubsetOf(set2)).to.equal(false); + expect(set2.isSubsetOf(set1)).to.equal(false); + }); + + it('isSubsetOf between sets with common values', () => { + const set1 = addValues(1, 8); + const set2 = addValues(3, 6); + expect(set1.isSubsetOf(set2)).to.equal(false); + expect(set2.isSubsetOf(set1)).to.equal(true); + + const set3 = addValues(1, 5); + const set4 = addValues(3, 6); + expect(set3.isSubsetOf(set4)).to.equal(false); + expect(set4.isSubsetOf(set3)).to.equal(false); + }); + + it('returns toString primitive types', () => { + expect(set.toString()).to.equal(''); + + set.add(1); + expect(set.toString()).to.equal('1'); + + set.add(2); + expect(set.toString()).to.equal('1,2'); + + set.clear(); + expect(set.toString()).to.equal(''); + }); + + it('returns toString primitive types: string', () => { + const ds = new Set(); + ds.add('el1'); + expect(ds.toString()).to.equal('el1'); + + ds.add('el2'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + const ds = new Set(); + expect(ds.toString()).to.equal(''); + + ds.add(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2'); + + ds.add(new MyObj(3, 4)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/ts/data-structures/sorted-linked-list.spec.ts b/test/ts/data-structures/sorted-linked-list.spec.ts new file mode 100644 index 00000000..02634f72 --- /dev/null +++ b/test/ts/data-structures/sorted-linked-list.spec.ts @@ -0,0 +1,341 @@ +import 'mocha'; +import { expect } from 'chai'; +import { SortedLinkedList, util } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('SortedLinkedList', () => { + let list: SortedLinkedList; + let min: number; + let max: number; + + beforeEach(() => { + list = new SortedLinkedList(); + min = 1; + max = 3; + }); + + function pushesElements() { + for (let i = max; i >= min; i--) { + list.push(i); + } + } + + function verifyList() { + let current = list.getHead(); + for (let i = min; i <= max && current; i++) { + expect(current).to.not.be.an('undefined'); + if (current) { + // TS strictNullChecks + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(i); + if (i < max) { + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + // TS strictNullChecks + expect(current.next.element).to.equal(i + 1); + } + } else { + expect(current.next).to.be.an('undefined'); + } + current = current.next; + } + } + } + + it('starts empty', () => { + expect(list.size()).to.equal(0); + expect(list.isEmpty()).to.equal(true); + expect(list.getHead()).to.be.an('undefined'); + }); + + it('pushes elements', () => { + pushesElements(); + verifyList(); + }); + + it('returns element at specific index: invalid position', () => { + // list is empty + expect(list.getElementAt(3)).to.be.an('undefined'); + }); + + it('returns element at specific index', () => { + let node; + + pushesElements(); + + for (let i = min; i <= max; i++) { + node = list.getElementAt(i - 1); + expect(node).to.not.be.an('undefined'); + if (node) { + expect(node.element).to.equal(i); + } + } + }); + + it('inserts elements first position empty list', () => { + const element = 1; + max = element; + expect(list.insert(element, 0)).to.equal(true); + verifyList(); + }); + + it('inserts elements first position not empty list', () => { + max = 2; + expect(list.insert(max)).to.equal(true); + + expect(list.insert(min, 0)).to.equal(true); + + verifyList(); + }); + + it('inserts elements invalid position empty list', () => { + // sorted list will ignore the index position + expect(list.insert(1, 1)).to.equal(true); + }); + + it('inserts elements invalid position not empty list', () => { + // sorted list will ignore the index position + const element = 1; + expect(list.insert(element, 0)).to.equal(true); + expect(list.insert(element, 2)).to.equal(true); + }); + + it('inserts elements in the middle of list', () => { + expect(list.insert(3, 0)).to.equal(true); + expect(list.insert(1, 0)).to.equal(true); + expect(list.insert(2, 1)).to.equal(true); + verifyList(); + }); + + it('inserts elements at the end of list', () => { + max = 5; + + for (let i = min; i <= max; i++) { + expect(list.insert(i , i - 1)).to.equal(true); + } + + verifyList(); + }); + + it('returns index of elements', () => { + let index; + + pushesElements(); + + for (let i = min; i <= max; i++) { + index = list.indexOf(i); + expect(index).to.equal(i - 1); + } + + expect(list.indexOf(max + 2)).to.equal(-1); + }); + + it('removes valid elements', () => { + let element; + + pushesElements(); + + for (let i = min; i <= max; i++) { + element = list.remove(i); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + } + }); + + it('removes invalid elements', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.remove(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position empty list', () => { + let element; + + for (let i = min; i <= max; i++) { + element = list.removeAt(i - 1); + expect(element).to.be.an('undefined'); + } + }); + + it('removes element invalid position not empty list', () => { + let element; + + pushesElements(); + + for (let i = max + 2; i <= max + 4; i++) { + element = list.removeAt(i); + expect(element).to.be.an('undefined'); + } + }); + + it('removes first element list single element', () => { + const value = 1; + list.push(value); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(value); + + expect(list.getHead()).to.be.an('undefined'); + expect(list.isEmpty()).to.equal(true); + }); + + it('removes first element list multiple elements', () => { + pushesElements(); + + const element = list.removeAt(0); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(min); + + min = 2; + verifyList(); + }); + + it('removes element from middle of list', () => { + pushesElements(); // 1, 2, 3 + + const element = list.removeAt(1); // element 2 + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(2); + + // list needs to be [1, 3] + let current = list.getHead(); + + // element 1 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(1); + expect(current.next).to.not.be.an('undefined'); + if (current.next) { + expect(current.next.element).to.equal(3); + current = current.next; + } + } + + // element 3 + expect(current).to.not.be.an('undefined'); + if (current) { + expect(current.element).to.not.be.an('undefined'); + expect(current.element).to.equal(3); + expect(current.next).to.be.an('undefined'); + } + }); + + it('removes element from end of list', () => { + let element; + + pushesElements(); + + const maxIndex = max; + for (let i = maxIndex; i >= min; i--) { + element = list.removeAt(i - 1); + expect(element).to.not.be.an('undefined'); + expect(element).to.equal(i); + max--; + verifyList(); + } + }); + + it('returns the head of the list', () => { + expect(list.getHead()).to.be.an('undefined'); + + list.push(1); + expect(list.getHead()).to.not.be.an('undefined'); + }); + + it('returns the correct size', () => { + expect(list.size()).to.equal(0); + + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.size()).to.equal(i); + } + + const size = max; + for (let i = min; i <= max; i++) { + list.remove(i); + expect(list.size()).to.equal(size - i); + } + + expect(list.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(list.isEmpty()).to.equal(true); + for (let i = min; i <= max; i++) { + list.push(i); + expect(list.isEmpty()).to.equal(false); + } + + for (let i = min; i < max; i++) { + list.remove(i); + expect(list.isEmpty()).to.equal(false); + } + list.remove(max); + expect(list.isEmpty()).to.equal(true); + + pushesElements(); + expect(list.isEmpty()).to.equal(false); + + list.clear(); + expect(list.isEmpty()).to.equal(true); + }); + + it('clears the list', () => { + expect(list.size()).to.equal(0); + list.clear(); + expect(list.size()).to.equal(0); + pushesElements(); + expect(list.size()).to.greaterThan(0); + list.clear(); + expect(list.size()).to.equal(0); + }); + + it('returns toString primitive types', () => { + expect(list.toString()).to.equal(''); + + list.push(1); + expect(list.toString()).to.equal('1'); + + list.push(2); + expect(list.toString()).to.equal('1,2'); + + list.clear(); + expect(list.toString()).to.equal(''); + }); + + function stringCompare(a: string, b: string): number { + return a.localeCompare(b); + } + + it('returns toString primitive types: string', () => { + + const ds = new SortedLinkedList(util.defaultEquals, stringCompare); + ds.push('el2'); + expect(ds.toString()).to.equal('el2'); + + ds.push('el1'); + expect(ds.toString()).to.equal('el1,el2'); + }); + + function myObjCompare(a: MyObj, b: MyObj): number { + return a.toString().localeCompare(b.toString()); + } + + it('returns toString objects', () => { + const ds = new SortedLinkedList(util.defaultEquals, myObjCompare); + expect(ds.toString()).to.equal(''); + + ds.push(new MyObj(3, 4)); + expect(ds.toString()).to.equal('3|4'); + + ds.push(new MyObj(1, 2)); + expect(ds.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/ts/data-structures/stack-array.spec.ts b/test/ts/data-structures/stack-array.spec.ts index f41f2429..0894d7de 100644 --- a/test/ts/data-structures/stack-array.spec.ts +++ b/test/ts/data-structures/stack-array.spec.ts @@ -5,7 +5,7 @@ import StackArray from '../../../src/ts/data-structures/stack-array'; describe('StackArray', () => { let stack: StackArray; - beforeEach(function() { + beforeEach(() => { stack = new StackArray(); }); diff --git a/test/ts/data-structures/stack-linked-list.spec.ts b/test/ts/data-structures/stack-linked-list.spec.ts new file mode 100644 index 00000000..9889fb17 --- /dev/null +++ b/test/ts/data-structures/stack-linked-list.spec.ts @@ -0,0 +1,159 @@ +import 'mocha'; +import { expect } from 'chai'; +import { StackLinkedList } from '../../../src/ts/index'; +import MyObj from './my-obj'; + +describe('StackLinkedList', () => { + let stack: StackLinkedList; + + beforeEach(() => { + stack = new StackLinkedList(); + }); + + it('starts empty', () => { + expect(stack.size()).to.equal(0); + expect(stack.isEmpty()).to.equal(true); + }); + + it('pushes elements', () => { + stack.push(1); + expect(stack.size()).to.equal(1); + stack.push(2); + expect(stack.size()).to.equal(2); + stack.push(3); + expect(stack.size()).to.equal(3); + + expect(stack.isEmpty()).to.equal(false); + }); + + it('pops elements', () => { + stack.push(1); + stack.push(2); + stack.push(3); + + expect(stack.pop()).to.equal(3); + expect(stack.pop()).to.equal(2); + expect(stack.pop()).to.equal(1); + expect(stack.pop()).to.equal(undefined); + }); + + it('implements LIFO logic', () => { + stack.push(1); + stack.push(2); + stack.push(3); + + expect(stack.pop()).to.equal(3); + expect(stack.pop()).to.equal(2); + expect(stack.pop()).to.equal(1); + expect(stack.pop()).to.equal(undefined); + }); + + it('allows to peek at the top element in he stack without popping it', () => { + expect(stack.peek()).to.equal(undefined); + + stack.push(1); + expect(stack.peek()).to.equal(1); + + stack.push(2); + expect(stack.peek()).to.equal(2); + + stack.pop(); + expect(stack.peek()).to.equal(1); + }); + + it('returns the correct size', () => { + expect(stack.size()).to.equal(0); + stack.push(1); + expect(stack.size()).to.equal(1); + stack.push(2); + expect(stack.size()).to.equal(2); + stack.push(3); + expect(stack.size()).to.equal(3); + + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + + stack.push(1); + stack.push(2); + stack.push(3); + + stack.pop(); + expect(stack.size()).to.equal(2); + stack.pop(); + expect(stack.size()).to.equal(1); + stack.pop(); + expect(stack.size()).to.equal(0); + stack.pop(); + expect(stack.size()).to.equal(0); + }); + + it('returns if it is empty', () => { + expect(stack.isEmpty()).to.equal(true); + stack.push(1); + expect(stack.isEmpty()).to.equal(false); + stack.push(2); + expect(stack.isEmpty()).to.equal(false); + stack.push(3); + expect(stack.isEmpty()).to.equal(false); + + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + + stack.push(1); + stack.push(2); + stack.push(3); + + stack.pop(); + expect(stack.isEmpty()).to.equal(false); + stack.pop(); + expect(stack.isEmpty()).to.equal(false); + stack.pop(); + expect(stack.isEmpty()).to.equal(true); + stack.pop(); + expect(stack.isEmpty()).to.equal(true); + }); + + it('clears the stack', () => { + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + + stack.push(1); + stack.push(2); + + stack.clear(); + expect(stack.isEmpty()).to.equal(true); + }); + + + it('returns toString primitive types', () => { + expect(stack.toString()).to.equal(''); + + stack.push(1); + expect(stack.toString()).to.equal('1'); + + stack.push(2); + expect(stack.toString()).to.equal('1,2'); + + stack.clear(); + expect(stack.toString()).to.equal(''); + + const stackString = new StackLinkedList(); + stackString.push('el1'); + expect(stackString.toString()).to.equal('el1'); + + stackString.push('el2'); + expect(stackString.toString()).to.equal('el1,el2'); + }); + + it('returns toString objects', () => { + + const stackMyObj = new StackLinkedList(); + expect(stackMyObj.toString()).to.equal(''); + + stackMyObj.push(new MyObj(1, 2)); + expect(stackMyObj.toString()).to.equal('1|2'); + + stackMyObj.push(new MyObj(3, 4)); + expect(stackMyObj.toString()).to.equal('1|2,3|4'); + }); +}); diff --git a/test/ts/data-structures/stack.spec.ts b/test/ts/data-structures/stack.spec.ts index 54770f3f..731e586c 100644 --- a/test/ts/data-structures/stack.spec.ts +++ b/test/ts/data-structures/stack.spec.ts @@ -5,7 +5,7 @@ import Stack from '../../../src/ts/data-structures/stack'; describe('Stack', () => { let stack: Stack; - beforeEach(function() { + beforeEach(() => { stack = new Stack(); }); @@ -47,7 +47,7 @@ describe('Stack', () => { expect(stack.pop()).to.equal(undefined); }); - it('allows to peek at the top element in he stack without popping it', () => { + it('allows to peek at the top element in the stack without popping it', () => { expect(stack.peek()).to.equal(undefined); stack.push(1); diff --git a/test/ts/others/factorial.spec.ts b/test/ts/others/factorial.spec.ts new file mode 100644 index 00000000..d785d11c --- /dev/null +++ b/test/ts/others/factorial.spec.ts @@ -0,0 +1,26 @@ +import 'mocha'; +import { expect } from 'chai'; +import { factorialIterative, factorial } from '../../../src/ts/index'; + +describe('Factorial', () => { + + it('Iterative Factorial', () => { + expect(factorialIterative(-1)).to.equal(undefined); + expect(factorialIterative(0)).to.equal(1); + expect(factorialIterative(1)).to.equal(1); + expect(factorialIterative(2)).to.equal(2); + expect(factorialIterative(3)).to.equal(6); + expect(factorialIterative(4)).to.equal(24); + expect(factorialIterative(5)).to.equal(120); + }); + + it('Recursive Factorial', () => { + expect(factorial(-1)).to.equal(undefined); + expect(factorial(0)).to.equal(1); + expect(factorial(1)).to.equal(1); + expect(factorial(2)).to.equal(2); + expect(factorial(3)).to.equal(6); + expect(factorial(4)).to.equal(24); + expect(factorial(5)).to.equal(120); + }); +}); diff --git a/test/ts/others/fibonacci.spec.ts b/test/ts/others/fibonacci.spec.ts new file mode 100644 index 00000000..27ad81f0 --- /dev/null +++ b/test/ts/others/fibonacci.spec.ts @@ -0,0 +1,34 @@ +import 'mocha'; +import { expect } from 'chai'; +import { fibonacci, fibonacciIterative, fibonacciMemoization } from '../../../src/ts/index'; + +describe('Fibonacci', () => { + + it('Fibonacci Recursive', () => { + expect(fibonacci(-1)).to.equal(0); + expect(fibonacci(0)).to.equal(0); + expect(fibonacci(1)).to.equal(1); + expect(fibonacci(2)).to.equal(1); + expect(fibonacci(3)).to.equal(2); + expect(fibonacci(4)).to.equal(3); + }); + + it('Fibonacci Iterative', () => { + expect(fibonacciIterative(-1)).to.equal(0); + expect(fibonacciIterative(0)).to.equal(0); + expect(fibonacciIterative(1)).to.equal(1); + expect(fibonacciIterative(2)).to.equal(1); + expect(fibonacciIterative(3)).to.equal(2); + expect(fibonacciIterative(4)).to.equal(3); + }); + + it('Fibonacci with Memoization', () => { + expect(fibonacciMemoization(-1)).to.equal(0); + expect(fibonacciMemoization(0)).to.equal(0); + expect(fibonacciMemoization(1)).to.equal(1); + expect(fibonacciMemoization(2)).to.equal(1); + expect(fibonacciMemoization(3)).to.equal(2); + expect(fibonacciMemoization(4)).to.equal(3); + }); + +}); diff --git a/test/ts/others/hot-potato.spec.ts b/test/ts/others/hot-potato.spec.ts new file mode 100644 index 00000000..7ac9b827 --- /dev/null +++ b/test/ts/others/hot-potato.spec.ts @@ -0,0 +1,16 @@ +import { hotPotato } from '../../../src/ts/others/hot-potato'; +import 'mocha'; +import { expect } from 'chai'; + +describe('Hot Potato with Queue', () => { + + it('Hot potato game', () => { + const names = ['John', 'Jack', 'Camila', 'Ingrid', 'Carl']; + expect(hotPotato(names, 6).winner).to.equal('Ingrid'); + expect(hotPotato(names, 7).winner).to.equal('John'); + expect(hotPotato(names, 8).winner).to.equal('Jack'); + expect(hotPotato(names, 9).winner).to.equal('Ingrid'); + expect(hotPotato(names, 10).winner).to.equal('Carl'); + }); + +}); diff --git a/test/ts/others/palindrome-checker.spec.ts b/test/ts/others/palindrome-checker.spec.ts new file mode 100644 index 00000000..82451113 --- /dev/null +++ b/test/ts/others/palindrome-checker.spec.ts @@ -0,0 +1,20 @@ +import 'mocha'; +import { expect } from 'chai'; +import { palindromeChecker } from '../../../src/ts/others/palindrome-checker'; + +describe('Palindrome', () => { + + it('Palindrome Checker', () => { + expect(palindromeChecker('')).to.equal(false); + expect(palindromeChecker('a')).to.equal(true); + expect(palindromeChecker('aa')).to.equal(true); + expect(palindromeChecker('aba')).to.equal(true); + expect(palindromeChecker('ab')).to.equal(false); + expect(palindromeChecker('kayak')).to.equal(true); + expect(palindromeChecker('radar')).to.equal(true); + expect(palindromeChecker('level')).to.equal(true); + expect(palindromeChecker('Was it a car or a cat I saw')).to.equal(true); + expect(palindromeChecker('Step on no pets')).to.equal(true); + expect(palindromeChecker('Able was I ere I saw Elba')).to.equal(true); + }); +}); diff --git a/tsconfig.json b/tsconfig.json index adb52da4..0acebfa5 100644 --- a/tsconfig.json +++ b/tsconfig.json @@ -3,7 +3,8 @@ /* Basic Options */ "target": "es6", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */ "module": "commonjs", /* Specify module code generation: 'none', commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */ - // "lib": [], /* Specify library files to be included in the compilation: */ + // "module": "es2015", /* Specify module code generation: 'none', commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */ + "lib": ["es2017"], /* Specify library files to be included in the compilation: */ // "allowJs": true, /* Allow javascript files to be compiled. */ // "checkJs": true, /* Report errors in .js files. */ // "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */ @@ -19,16 +20,16 @@ // "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */ /* Strict Type-Checking Options */ - "strict": true /* Enable all strict type-checking options. */ - // "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */ + // "strict": true /* Enable all strict type-checking options. */ + "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */ // "strictNullChecks": true, /* Enable strict null checks. */ - // "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */ - // "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */ + "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */ + "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */ /* Additional Checks */ - // "noUnusedLocals": true, /* Report errors on unused locals. */ - // "noUnusedParameters": true, /* Report errors on unused parameters. */ - // "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */ + "noUnusedLocals": true, /* Report errors on unused locals. */ + "noUnusedParameters": true, /* Report errors on unused parameters. */ + "noImplicitReturns": true /* Report error when not all code paths in function return a value. */ // "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */ /* Module Resolution Options */ diff --git a/webpack.config.js b/webpack.config.js index f7cdebe0..6d033ef4 100644 --- a/webpack.config.js +++ b/webpack.config.js @@ -1,7 +1,7 @@ // @ts-check /* eslint-disable */ const webpack = require('webpack'); -const UglifyJsPlugin = webpack.optimize.UglifyJsPlugin; +const UglifyJsPlugin = require('uglifyjs-webpack-plugin');; const path = require('path'); const env = require('yargs').argv.env; @@ -11,7 +11,7 @@ let plugins = [], outputFile; if (env === 'build') { - plugins.push(new UglifyJsPlugin({ minimize: true })); + // plugins.push(new UglifyJsPlugin({ minimize: true })); outputFile = libraryName + '.min.js'; } else { outputFile = libraryName + '.js'; @@ -40,7 +40,17 @@ const config = { modules: [path.resolve('./node_modules'), path.resolve('./src/js')], extensions: ['.json', '.js'] }, - plugins: plugins + optimization: { + minimizer: [ + // we specify a custom UglifyJsPlugin here to get source maps in production + new UglifyJsPlugin({ + cache: true, + parallel: true, + sourceMap: true + }) + ] + } + // plugins: plugins }; module.exports = config;