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[Heap]
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‎examples/PacktDataStructuresAlgorithms.min.js

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‎examples/PacktDataStructuresAlgorithms.min.js.map

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‎examples/chapter10/01-UsingMinHeap.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="01-UsingMinHeap.js"></script>
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</body>
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</html>

‎examples/chapter10/01-UsingMinHeap.js

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const { MinHeap } = PacktDataStructuresAlgorithms;
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const heap = new MinHeap();
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heap.insert(2);
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heap.insert(3);
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heap.insert(4);
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heap.insert(5);
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heap.insert(1);
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console.log(heap.getAsArray());
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console.log('Heap size: ', heap.size()); // 5
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console.log('Heap is empty: ', heap.isEmpty()); // false
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console.log('Heap min value: ', heap.findMinimum()); // 1
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heap.insert(6);
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heap.insert(7);
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console.log(heap.getAsArray());
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console.log('Extract minimum: ', heap.extract());
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console.log(heap.getAsArray());
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‎examples/chapter10/02-UsingMaxHeap.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-UsingMaxHeap.js"></script>
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</body>
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</html>

‎examples/chapter10/02-UsingMaxHeap.js

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const { MaxHeap } = PacktDataStructuresAlgorithms;
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const maxHeap = new MaxHeap();
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maxHeap.insert(2);
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maxHeap.insert(3);
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maxHeap.insert(4);
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maxHeap.insert(5);
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maxHeap.insert(1);
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console.log(maxHeap.getAsArray());
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console.log('Heap size: ', maxHeap.size()); // 5
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console.log('Heap is empty: ', maxHeap.isEmpty()); // false
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console.log('Heap min value: ', maxHeap.findMinimum()); // 5
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maxHeap.insert(6);
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maxHeap.insert(9);
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maxHeap.insert(10);
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maxHeap.insert(14);
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console.log(maxHeap.getAsArray());
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console.log('Extract minimum: ', maxHeap.extract());
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console.log(maxHeap.getAsArray());
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‎examples/chapter10/03-HeapSort.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-HeapSort.js"></script>
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</body>
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</html>

‎examples/chapter10/03-HeapSort.js

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const { heapSort } = PacktDataStructuresAlgorithms;
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console.log('********** Heap Sort **********');
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const array = [7, 6, 3, 5, 4, 1, 2];
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console.log('Before sorting: ', array);
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console.log('After sorting: ', heapSort(array));

‎examples/index.html

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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-10">
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<div class="page-content">
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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="chapter10/01-UsingMinHeap.html">01-UsingMinHeap</a>
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<a class="mdl-navigation__link" href="chapter10/02-UsingMaxHeap.html">02-UsingMaxHeap</a>
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<a class="mdl-navigation__link" href="chapter10/03-HeapSort.html">03-HeapSort</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-11">
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<div class="page-content">
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<div class="page-content mdl-layout--fixed-drawer">

‎package.json

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"tslint": "^5.9.1",
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"typescript": "^2.7.2",
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"webpack": "^4.1.1",
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"webpack-cli": "^2.0.12",
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"yargs": "^11.0.0"
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}
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}

‎src/js/data-structures/heap.js

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clear() {
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this.heap = [];
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}
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find() {
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findMinimum() {
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return this.isEmpty() ? undefined : this.heap[0];
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}
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insert(value) {
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const left = this.getLeftIndex(index);
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const right = this.getRightIndex(index);
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const size = this.size();
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if (left < size && this.compareFn(this.heap[element], this.heap[left]) > Compare.BIGGER_THAN) {
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if (
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left < size &&
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this.compareFn(this.heap[element], this.heap[left]) === Compare.BIGGER_THAN
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) {
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element = left;
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}
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if (
5053
right < size &&
51-
this.compareFn(this.heap[element], this.heap[right]) > Compare.BIGGER_THAN
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this.compareFn(this.heap[element], this.heap[right]) === Compare.BIGGER_THAN
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) {
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element = right;
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}
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}
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siftUp(index) {
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let parent = this.getParentIndex(index);
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while (index > 0 && this.compareFn(this.heap[parent], this.heap[index]) > Compare.BIGGER_THAN) {
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while (
66+
index > 0 &&
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this.compareFn(this.heap[parent], this.heap[index]) === Compare.BIGGER_THAN
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) {
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swap(this.heap, parent, index);
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index = parent;
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parent = this.getParentIndex(index);
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heapify(array) {
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if (array) {
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this.heap = array;
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this.heap.unshift(null); // remove all null elements
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}
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for (let i = this.size() - 1; i > 0; i--) {
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const maxIndex = Math.floor(this.size() / 2) - 1;
90+
for (let i = 0; i <= maxIndex; i++) {
8591
this.siftDown(i);
8692
}
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return this.heap;
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}
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getAsArray() {
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return this.heap;
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}
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}
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export class MaxHeap extends MinHeap {

‎src/ts/data-structures/heap.ts

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104104
return this.heap;
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}
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getAsArray() {
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return this.heap;
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}
106110
}
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export class MaxHeap<T> extends MinHeap<T> {

‎test/ts/data-structures/heap.spec.ts

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import 'mocha';
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// import { expect } from 'chai';
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import { expect } from 'chai';
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import { MinHeap } from '../../../src/ts/index';
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import { MaxHeap } from '../../../src/ts/data-structures/heap';
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import heapSort from '../../../src/ts/algorithms/sorting/heap-sort';
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});
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18-
it('inserts elements in the AVLTree', () => {
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it('inserts elements in the Heap', () => {
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let min = 2;
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20-
heap.insert(3);
2122
heap.insert(2);
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heap.insert(1);
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expect(heap.findMinimum()).to.equal(min);
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heap.insert(3);
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expect(heap.findMinimum()).to.equal(min);
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heap.insert(4);
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expect(heap.findMinimum()).to.equal(min);
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heap.insert(5);
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expect(heap.findMinimum()).to.equal(min);
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heap.insert(1);
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min = 1;
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expect(heap.findMinimum()).to.equal(min);
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35+
heap.insert(6);
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heap.insert(9);
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heap.insert(10);
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heap.insert(14);
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heap.extract();
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heap.extract();

‎webpack.config.js

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// @ts-check
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/* eslint-disable */
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const webpack = require('webpack');
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const UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
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const UglifyJsPlugin = require('uglifyjs-webpack-plugin');;
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const path = require('path');
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const env = require('yargs').argv.env;
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outputFile;
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if (env === 'build') {
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plugins.push(new UglifyJsPlugin({ minimize: true }));
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// plugins.push(new UglifyJsPlugin({ minimize: true }));
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outputFile = libraryName + '.min.js';
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} else {
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outputFile = libraryName + '.js';
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4040
modules: [path.resolve('./node_modules'), path.resolve('./src/js')],
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extensions: ['.json', '.js']
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},
43-
plugins: plugins
43+
optimization: {
44+
minimizer: [
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// we specify a custom UglifyJsPlugin here to get source maps in production
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new UglifyJsPlugin({
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cache: true,
48+
parallel: true,
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sourceMap: true
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})
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]
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}
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// plugins: plugins
4454
};
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4656
module.exports = config;

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