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Commit eaba737

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Stack 👗
1 parent df7eaf7 commit eaba737

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2 files changed

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2 files changed

+106
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‎examples/datastructures/stack.js

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class Stack {
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constructor() {
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this.dataStore = [];
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this.top = -1;
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}
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push(element) {
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this.top++;
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this.dataStore.push(element);
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}
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pop() {
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this.top--;
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return this.dataStore.pop();
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}
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peek() {
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return this.dataStore[this.top];
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}
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clear() {
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if(~this.top)
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while(this.top--)
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this.dataStore.pop();
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}
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empty() {
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return !~this.top;
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}
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length() {
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return this.top + 1;
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}
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}
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module.exports = Stack;

‎test/datastructures/stack.test.js

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const expect = require('chai').expect;
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const Stack = require('../../examples/datastructures/stack');
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describe('=> STACK', function() {
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let numbers;
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before(function () {
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numbers = new Stack();
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});
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it('should create an Empty Stack', function(done) {
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expect(numbers.dataStore).to.deep.equal([]);
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expect(numbers.top).to.equal(-1);
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done();
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});
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it('should push elements into the Stack', function(done) {
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numbers.push(1);
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numbers.push(2);
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numbers.push(3);
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numbers.push(4);
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expect(numbers.dataStore).to.deep.equal([1,2,3,4]);
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expect(numbers.top).to.equal(3);
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done();
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});
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describe('=> pop', function() {
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it('should pop 1 element of the Stack', function(done) {
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numbers.pop();
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expect(numbers.dataStore).to.deep.equal([1,2,3]);
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expect(numbers.top).to.equal(2);
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done();
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});
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it('should pop all elements of the Stack', function(done) {
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numbers.pop();
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numbers.pop();
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numbers.pop();
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expect(numbers.dataStore).to.deep.equal([]);
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expect(numbers.top).to.equal(-1);
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done();
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});
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});
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it('should peek the Stack', function(done) {
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expect(numbers.peek()).to.deep.equal(4);
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done();
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});
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it('should check if the Stack 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 Stack', 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('=> clear', function() {
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it('should clear the Stack', function(done) {
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numbers.clear();
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expect(numbers.top).to.equal(-1);
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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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