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Commit 04b306e

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Queue ⚡
1 parent eaba737 commit 04b306e

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2 files changed

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2 files changed

+112
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‎examples/datastructures/queue.js

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class Queue {
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constructor() {
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this.dataStore = [];
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}
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enqueue(element) {
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this.dataStore.push(element);
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}
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dequeue() {
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return this.dataStore.shift();
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}
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clear() {
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this.dataStore = [];
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}
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front() {
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return this.dataStore[0];
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}
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back() {
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return this.dataStore[this.dataStore.length - 1];
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}
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toString() {
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const str = "";
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for (let i = 0; i < this.dataStore.length; i++)
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str += this.dataStore[i] + " ";
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return str;
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}
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empty() {
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return this.dataStore.length == 0;
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}
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peek() {
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return this.dataStore[0];
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}
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length() {
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return this.dataStore.length;
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}
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}
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module.exports = Queue;

‎test/datastructures/queue.test.js

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const expect = require('chai').expect;
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const Queue = require('../../examples/datastructures/queue');
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describe('=> QUEUE', function() {
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let numbers;
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before(function () {
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numbers = new Queue();
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});
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it('should create an Empty Queue', function(done) {
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expect(numbers.dataStore).to.deep.equal([]);
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done();
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});
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it('should enqueue elements into the Queue', function(done) {
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numbers.enqueue(1);
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numbers.enqueue(2);
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numbers.enqueue(3);
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numbers.enqueue(4);
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expect(numbers.dataStore).to.deep.equal([1,2,3,4]);
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done();
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});
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it('should peek the Queue', function(done) {
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expect(numbers.peek()).to.deep.equal(1);
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done();
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});
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it('should check if the Queue is empty', function(done) {
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expect(numbers.empty()).to.equal(false);
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done();
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});
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it('should check the length of the Queue', function(done) {
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expect(numbers.length()).to.equal(4);
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done();
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});
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describe('=> dequeue', function() {
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it('should dequeue 1 element of the Queue', function(done) {
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numbers.dequeue();
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expect(numbers.dataStore).to.deep.equal([2,3,4]);
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done();
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});
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it('should dequeue all elements of the Queue', function(done) {
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numbers.dequeue();
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numbers.dequeue();
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numbers.dequeue();
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expect(numbers.dataStore).to.deep.equal([]);
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done();
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});
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});
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describe('=> clear', function() {
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it('should clear the Queue', function(done) {
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numbers.clear();
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expect(numbers.dataStore).to.deep.equal([]);
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done();
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});
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});
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});

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