freeCodeCamp/curriculum/challenges/arabic/02-javascript-algorithms-an.../es6/mutate-an-array-declared-wi...

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---
id: 587d7b87367417b2b2512b42
title: Mutate an Array Declared with const
challengeType: 1
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'getUserInput => assert(getUserInput("index").match(/const/g), "Do not replace <code>const</code> keyword.");'
- text: ''
testString: 'getUserInput => assert(getUserInput("index").match(/const\s+s/g), "<code>s</code> should be a constant variable (by using <code>const</code>).");'
- text: ''
testString: 'getUserInput => assert(getUserInput("index").match(/const\s+s\s*=\s*\[\s*5\s*,\s*7\s*,\s*2\s*\]\s*;?/g), "Do not change the original array declaration.");'
- text: ''
testString: 'assert.deepEqual(s, [2, 5, 7], "<code>s</code> should be equal to <code>[2, 5, 7]</code>.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
const s = [5, 7, 2];
function editInPlace() {
"use strict";
// change code below this line
// s = [2, 5, 7]; <- this is invalid
// change code above this line
}
editInPlace();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>