83 lines
1.7 KiB
Markdown
83 lines
1.7 KiB
Markdown
---
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id: cf1111c1c11feddfaeb8bdef
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title: Modify Array Data With Indexes
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/czQM4A8'
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forumTopicId: 18241
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---
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## Description
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<section id='description'>
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Unlike strings, the entries of arrays are <dfn>mutable</dfn> and can be changed freely.
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<strong>Example</strong>
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```js
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var ourArray = [50,40,30];
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ourArray[0] = 15; // equals [15,40,30]
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```
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<strong>Note</strong><br>There shouldn't be any spaces between the array name and the square brackets, like <code>array [0]</code>. Although JavaScript is able to process this correctly, this may confuse other programmers reading your code.
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</section>
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## Instructions
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<section id='instructions'>
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Modify the data stored at index <code>0</code> of <code>myArray</code> to a value of <code>45</code>.
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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: <code>myArray</code> should now be [45,64,99].
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testString: assert((function(){if(typeof myArray != 'undefined' && myArray[0] == 45 && myArray[1] == 64 && myArray[2] == 99){return true;}else{return false;}})());
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- text: You should be using correct index to modify the value in <code>myArray</code>.
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testString: assert((function(){if(code.match(/myArray\[0\]\s*=\s*/g)){return true;}else{return false;}})());
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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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// Example
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var ourArray = [18,64,99];
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ourArray[1] = 45; // ourArray now equals [18,45,99].
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// Setup
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var myArray = [18,64,99];
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// Only change code below this line
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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if(typeof myArray !== "undefined"){(function(){return myArray;})();}
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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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var myArray = [18,64,99];
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myArray[0] = 45;
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```
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</section>
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