fix(challenge-md): Fix file names and preserve challenge order in meta.json

curriculum/challenges/en/08-coding-interview-prep/data-structures/create-a-set-class.en.md

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+---
+id: 8d1323c8c441eddfaeb5bdef
+title: Create a Set Class
+challengeType: 1
+---
+
+## Description
+<section id='description'>
+In the next few exercises we are going to create a function to emulate a data structure called a "Set". A Set is like an array, but it cannot contain duplicate values. The typical use for a Set is to simply check for the presence of an item. This can be implemented with an object, for instance:
+<blockquote>var set = new Object();<br>set.foo = true;<br>// See if foo exists in our set:<br>console.log(set.foo) // true</blockquote>
+In the next few exercises, we will build a full featured Set from scratch.
+For this exercise, create a function that will add a value to our set collection as long as the value does not already exist in the set. For example:
+<blockquote>this.add = function(element) {<br>  //some code to add value to the set<br>}</blockquote>
+The function should return <code>true</code> if the value is successfully added and <code>false</code> otherwise.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+- text: Your <code>Set</code> class should have an <code>add</code> method.
+  testString: 'assert((function(){var test = new Set(); return (typeof test.add === ''function'')}()), ''Your <code>Set</code> class should have an <code>add</code> method.'');'
+- text: Your <code>add</code> method should not add duplicate values.
+  testString: 'assert((function(){var test = new Set(); test.add(''a''); test.add(''b''); test.add(''a''); var vals = test.values(); return (vals[0] === ''a'' && vals[1] === ''b'' && vals.length === 2)}()), ''Your <code>add</code> method should not add duplicate values.'');'
+- text: Your <code>add</code> method should return <code>true</code> when a value has been successfully added.
+  testString: 'assert((function(){var test = new Set(); var result = test.add(''a''); return (result != undefined) && (result === true);}()), ''Your <code>add</code> method should return <code>true</code> when a value has been successfully added.'');'
+- text: Your <code>add</code> method should return <code>false</code> when a duplicate value is added.
+  testString: 'assert((function(){var test = new Set(); test.add(''a''); var result = test.add(''a''); return (result != undefined) && (result === false);}()), ''Your <code>add</code> method should return <code>false</code> when a duplicate value is added.'');'
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function Set() {
+    // the var collection will hold our set
+    var collection = [];
+    // this method will check for the presence of an element and return true or false
+    this.has = function(element) {
+        return (collection.indexOf(element) !== -1);
+    };
+    // this method will return all the values in the set
+    this.values = function() {
+        return collection;
+    };
+    // change code below this line
+    // change code above this line
+}
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+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;}};}
+```
+
+</section>