85 lines
2.5 KiB
Markdown
85 lines
2.5 KiB
Markdown
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---
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id: 8d1923c8c441eddfaeb5bdef
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title: Size of the Set
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challengeType: 1
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---
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## Description
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<section id='description'>
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In this exercise we are going to create a size function for our Set. This function should be named <code>this.size</code> and it should return the size of the collection.
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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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: Your <code>Set</code> class should have a <code>size</code> method.
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testString: 'assert((function(){var test = new Set(); return (typeof test.size === ''function'')}()), ''Your <code>Set</code> class should have a <code>size</code> method.'');'
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- text: The <code>size</code> method should return the number of elements in the collection.
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testString: 'assert((function(){var test = new Set(); test.add(''a'');test.add(''b'');test.remove(''a'');return (test.size() === 1)}()), ''The <code>size</code> method should return the number of elements in the collection.'');'
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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 Set() {
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// the var collection will hold the set
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var collection = [];
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// this method will check for the presence of an element and return true or false
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this.has = function(element) {
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return (collection.indexOf(element) !== -1);
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};
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// this method will return all the values in the set
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this.values = function() {
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return collection;
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};
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// this method will add an element to the set
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this.add = function(element) {
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if(!this.has(element)){
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collection.push(element);
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return true;
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}
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return false;
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};
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// this method will remove an element from a set
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this.remove = function(element) {
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if(this.has(element)){
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var index = collection.indexOf(element);
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collection.splice(index,1);
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return true;
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}
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return false;
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};
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// change code below this line
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// 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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function Set() {var collection = []; this.has = function(e){return(collection.indexOf(e) !== -1);};this.values = function() {return collection;};this.add = function(element) {if (!this.has(element)) {collection.push(element);return true;} else {return false;}};this.remove = function(element) {if(this.has(element)) {var i = collection.indexOf(element);collection.splice(i, 1);return true;}return false;};this.size = function() {return collection.length;};}
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```
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</section>
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