70 lines
2.8 KiB
Markdown
70 lines
2.8 KiB
Markdown
---
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id: 587d8255367417b2b2512c74
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title: Create a Priority Queue Class
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challengeType: 1
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videoUrl: ''
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localeTitle: ''
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---
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## Description
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undefined
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## Instructions
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undefined
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: ''
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testString: 'assert((function(){var test = new PriorityQueue(); return (typeof test.enqueue === "function")}()), "Your <code>Queue</code> class should have a <code>enqueue</code> method.");'
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- text: ''
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testString: 'assert((function(){var test = new PriorityQueue(); return (typeof test.dequeue === "function")}()), "Your <code>Queue</code> class should have a <code>dequeue</code> method.");'
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- text: ''
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testString: 'assert((function(){var test = new PriorityQueue(); return (typeof test.size === "function")}()), "Your <code>Queue</code> class should have a <code>size</code> method.");'
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- text: ''
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testString: 'assert((function(){var test = new PriorityQueue(); return (typeof test.isEmpty === "function")}()), "Your <code>Queue</code> class should have an <code>isEmpty</code> method.");'
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- text: ''
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testString: 'assert((function(){var test = new PriorityQueue(); test.enqueue(["David Brown", 2]); test.enqueue(["Jon Snow", 1]); var size1 = test.size(); test.dequeue(); var size2 = test.size(); test.enqueue(["A", 3]); test.enqueue(["B", 3]); test.enqueue(["C", 3]); return (size1 === 2 && size2 === 1 && test.size() === 4)}()), "Your PriorityQueue should correctly keep track of the current number of items using the <code>size</code> method as items are enqueued and dequeued.");'
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- text: ''
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testString: 'assert((function(){var test = new PriorityQueue(); test.enqueue(["A", 1]); test.enqueue(["B", 1]); test.dequeue(); var first = test.isEmpty(); test.dequeue(); return (!first && test.isEmpty()); }()), "The <code>isEmpty</code> method should return <code>true</code> when the queue is empty.");'
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- text: ''
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testString: 'assert((function(){var test = new PriorityQueue(); test.enqueue(["A", 5]); test.enqueue(["B", 5]); test.enqueue(["C", 5]); test.enqueue(["D", 3]); test.enqueue(["E", 1]); test.enqueue(["F", 7]); var result = []; result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); return result.join("") === "EDABCF";}()), "The priority queue should return items with a higher priority before items with a lower priority and return items in first-in-first-out order otherwise.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function PriorityQueue () {
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this.collection = [];
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this.printCollection = function() {
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console.log(this.collection);
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};
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// Only change code below this line
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// Only change code above this line
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}
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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