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chapter 03: [Stacks]
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‎.eslintrc.json

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"class-methods-use-this": 0,
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"no-plusplus": 0,
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"arrow-parens": 0,
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"no-console": 0
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"no-console": 0,
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"import/prefer-default-export": 0,
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"comma-dangle": 0,
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"no-underscore-dangle": 0
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}
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}

‎.gitignore

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coverage
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.nyc_output
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coverage.lcov
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mochawesome-report/*
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dist/js/*
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dist/ts/*

‎README.md

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[![Build Status](https://travis-ci.org/loiane/javascript-datastructures-algorithms.svg?branch=third-edition)](https://travis-ci.org/loiane/javascript-datastructures-algorithms)
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[![codecov](https://codecov.io/gh/loiane/javascript-datastructures-algorithms/branch/third-edition/graph/badge.svg)](https://codecov.io/gh/loiane/javascript-datastructures-algorithms)
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Source code of **Learning JavaScript Data Structures and Algorithms** book.
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Source code of **Learning JavaScript Data Structures and Algorithms** book, third edition.
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Work in Progress.
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## List of available chapters:
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* 01: [JavaScript, ECMAScript and TypeScript: a quick overview](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter01)
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* 02: [Arrays](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter02)
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* 03: [Stacks](https://github.com/loiane/javascript-datastructures-algorithms/tree/third-edition/examples/chapter03)
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## Thrid Edition Updates
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* Algorithms using ES2015+
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* Creation of a Data Structure and Algorithms library that can be used in the browser or with Node.js
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* Algorithms tested with Mocha + Chai (test code available in `test` directory)
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* TypeScript version of the source code included
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## Installing and running the book examples With Node
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* To see the examples, run `http-server html` or `npm run serve`. Open your browser `http:\\localhost:8080` to see the book examples
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* Or `cd html/chapter01` and run each javascript file with node: `node 02-Variables`
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## Running the book examples in the browser
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## Running the examples in the browser
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* Right click on the html file you would like to see the examples, right click and 'Open with Chrome (or any other browser)'
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## List of all available examples:
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* 01: JavaScript, ECMAScript and TypeScript: a quick overview
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- 01-HelloWorld
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- 02-Variables
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- 03-Operators
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- 04-TruthyFalsy
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- 05-EqualsOperators
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- 06-ConditionalStatements
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- 07-Loops
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- 08-Functions
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- 10-ObjectOrientedJS
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- 11-ES6letconst
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- 12-Es6StringTemplates
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- 13-ES6ArrowFunctions
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- 14-ES6ParameterHandling
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- 15-ES6EnhancedObjectProperties
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- 16-ES6Classes
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- 17-TypeScript
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* 02: Arrays
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- 01-Introduction
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- 02-CreatingAndInitialingArrays
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- 03-AddingRemovingElements
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- 04-TwoDimensionalMultiDimensional
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- 05-ArrayMethods
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- 06-ES6Methods
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- 07-TypedArrays
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Happy Coding!

‎examples/PacktDataStructuresAlgorithms.min.js

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‎examples/chapter03/01-Stack.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title></title>
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</head>
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<body>
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<script src="./../../dist/js/data-structures/stack.js"></script>
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<script src="./../../dist/js/data-structures/stack-array.js"></script>
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<script type="module" src="01-Stack.js"></script>
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</body>
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</html>

‎examples/chapter03/01-Stack.js

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import Stack from './../../src/js/data-structures/stack.js'; // ES2015 modules
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import StackArray from './../../src/js/data-structures/stack-array.js'; // ES2015 modules
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// const Stack = require('../../dist/js/data-structures/stack'); // for node
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// const Stack = stack; // older browsers - remove from html script import: type="module"
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const stack = new Stack(); // new StackArray();
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// using WeakMap to store Stack items we ensure true privacy
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// console.log(Object.getOwnPropertyNames(stack));
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// console.log(Object.keys(stack));
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console.log('stack.isEmpty() => ', stack.isEmpty()); // outputs true
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stack.push(5);
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stack.push(8);
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console.log('stack after push 5 and 8 => ', stack.toString());
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console.log('stack.peek() => ', stack.peek()); // outputs 8
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stack.push(11);
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console.log('stack.size() after push 11 => ', stack.size()); // outputs 3
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console.log('stack.isEmpty() => ', stack.isEmpty()); // outputs false
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stack.push(15);
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stack.pop();
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stack.pop();
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console.log('stack.size() after push 15 and pop twice => ', stack.size()); // outputs 2

‎examples/chapter03/01-StackSymbol.js

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const _items = Symbol('stackItems');
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class Stack {
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constructor() {
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this[_items] = [];
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}
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push(element) {
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this[_items].push(element);
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}
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pop() {
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return this[_items].pop();
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}
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peek() {
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return this[_items][this[_items].length - 1];
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}
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isEmpty() {
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return this[_items].length === 0;
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}
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size() {
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return this[_items].length;
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}
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clear() {
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this[_items] = [];
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}
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print() {
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console.log(this.toString());
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}
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toString() {
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return this[_items].toString();
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}
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}
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const stack = new Stack();
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const objectSymbols = Object.getOwnPropertySymbols(stack);
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console.log(objectSymbols.length); // 1
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console.log(objectSymbols); // [Symbol()]
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console.log(objectSymbols[0]); // Symbol()
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stack[objectSymbols[0]].push(1);
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stack.print(); // 5, 8, 1

‎examples/chapter03/02-BalancedSymbols.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title></title>
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</head>
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<body>
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<script src="./../PacktDataStructuresAlgorithms.min.js"></script>
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<script src="02-BalancedSymbols.js"></script>
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</body>
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</html>

‎examples/chapter03/02-BalancedSymbols.js

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const parenthesesChecker = PacktDataStructuresAlgorithms.parenthesesChecker;
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console.log('{([])}', parenthesesChecker('{([])}')); // true
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console.log('{{([][])}()}', parenthesesChecker('{{([][])}()}')); // true
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console.log('[{()]', parenthesesChecker('[{()]')); // false

‎examples/chapter03/03-DecimalToBinary.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title></title>
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</head>
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<body>
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<script src="./../PacktDataStructuresAlgorithms.min.js"></script>
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<script src="03-DecimalToBinary.js"></script>
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</body>
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</html>

‎examples/chapter03/03-DecimalToBinary.js

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const decimalToBinary = PacktDataStructuresAlgorithms.parenthesesChecker;
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const baseConverter = PacktDataStructuresAlgorithms.baseConverter;
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// 233 == 11101001
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// 2x(10x10) + 3x(10) + 3x(1)
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console.log(decimalToBinary(233));
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console.log(decimalToBinary(10));
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console.log(decimalToBinary(1000));
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console.log(baseConverter(100345, 2));
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console.log(baseConverter(100345, 8));
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console.log(baseConverter(100345, 16));

‎examples/chapter03/04-TowerOfHanoi.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title></title>
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</head>
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<body>
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<script src="./../PacktDataStructuresAlgorithms.min.js"></script>
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<script src="04-TowerOfHanoi.js"></script>
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</body>
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</html>

‎examples/chapter03/04-TowerOfHanoi.js

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const hanoiStack = PacktDataStructuresAlgorithms.hanoiStack;
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const hanoi = PacktDataStructuresAlgorithms.hanoi;
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console.log(hanoiStack(3));
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console.log(hanoi(3, 'source', 'helper', 'dest'));

‎examples/chapter03/index.html

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‎examples/chapter03/index.js

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‎examples/index.html

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<a href="#scroll-tab-1" class="mdl-layout__tab is-active">01</a>
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<a href="#scroll-tab-2" class="mdl-layout__tab">02</a>
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<a href="#scroll-tab-3" class="mdl-layout__tab">03</a>
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<a href="#scroll-tab-3" class="mdl-layout__tab">04</a>
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<a href="#scroll-tab-3" class="mdl-layout__tab">05</a>
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<a href="#scroll-tab-3" class="mdl-layout__tab">06</a>
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<a href="#scroll-tab-4" class="mdl-layout__tab">04</a>
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<a href="#scroll-tab-4" class="mdl-layout__tab">05</a>
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<a href="#scroll-tab-4" class="mdl-layout__tab">06</a>
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</div>
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</header>
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<main class="mdl-layout__content">
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</section>
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<section class="mdl-layout__tab-panel" id="scroll-tab-3">
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<div class="page-content">
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Soon.
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<div class="page-content mdl-layout--fixed-drawer">
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<div class="mdl-layout__drawer is-visible">
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<nav class="mdl-navigation">
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<a class="mdl-navigation__link" href="./chapter03/01-Stack.html">01-Stack</a>
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</nav>
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</div>
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</div>
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</div>
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</section>
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<section class="mdl-layout__tab-panel" id="scroll-tab-4">
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<div class="page-content">
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Soon.
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</section>
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‎package.json

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},
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"homepage": "https://github.com/loiane/javascript-datastructures-algorithms",
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"scripts": {
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"clean": "rm -rf ./dist ./coverage ./.nyc_output ./coverage.lcov",
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"clean": "rm -rf ./dist ./coverage ./.nyc_output ./coverage.lcov ./mochawesome-report",
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"build:js": "babel src/js -d dist/js",
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"build:ts": "tsc -p ./ --rootDir ./src/ts",
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"build": "npm run build:js && npm run build:ts",
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"lint:js": "eslint src/js && eslint test/js",
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"lint:ts": "tslint -c tslint.json 'src/ts/**/*.ts' && tslint -c tslint.json 'test/ts/**/*.ts'",
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"lint": "npm run lint:js && npm run lint:ts",
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"test:js": "mocha --compilers js:babel-core/register ./test/js/**/*.spec.js",
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"test:js": "mocha --compilers js:babel-core/register ./test/js/**/*.spec.js --reporter mochawesome",
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"test:ts": "mocha -r ts-node/register --recursive ./test/ts/**/*.spec.ts",
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"test": "npm run test:js && npm run test:ts",
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"dev": "npm run clean && npm run lint && npm run generate-report",
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"coverage": "npm run generate-report && nyc report --reporter=text-lcov > coverage.lcov && codecov",
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"generate-report": "nyc --report-dir coverage npm run test && nyc report --reporter=text",
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"go": "npm run clean && npm run lint && npm run build && npm run test"
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"go": "npm run clean && npm run lint && npm run build && npm run test",
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"webpack": "webpack --env build"
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"include": [
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"babel-cli": "^6.26.0",
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"babel-core": "^6.26.0",
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"babel-eslint": "^8.0.0",
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"babel-loader": "^7.1.2",
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"babel-plugin-add-module-exports": "^0.2.1",
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"babel-plugin-transform-es2015-modules-umd": "^6.24.1",
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"babel-preset-env": "^1.6.0",
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"eslint-plugin-import": "^2.7.0",
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"istanbul": "^v1.1.0-alpha.1",
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"mocha": "^3.5.0",
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"mochawesome": "^2.3.1",
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"ts-node": "^3.3.0",
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"typescript": "^2.5.2"
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"typescript": "^2.5.2",
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"webpack": "^3.6.0",
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"yargs": "^9.0.1"
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‎src/js/data-structures/stack-array.js

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// @ts-check
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export default class StackArray {
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constructor() {
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this._items = [];
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}
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push(element) {
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this._items.push(element);
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}
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pop() {
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return this._items.pop();
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}
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peek() {
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return this._items[this._items.length - 1];
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}
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isEmpty() {
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return this._items.length === 0;
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}
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size() {
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return this._items.length;
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}
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clear() {
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this._items = [];
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}
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toArray() {
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return this._items;
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}
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toString() {
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return this._items.toString();
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}
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}

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