freeCodeCamp/curriculum/challenges/arabic/08-coding-interview-prep/rosetta-code/identity-matrix.arabic.md

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---
title: Identity matrix
id: 5a23c84252665b21eecc7eb1
challengeType: 5
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'assert(typeof idMatrix=="function","<code>idMatrix</code> should be a function.");'
- text: ''
testString: 'assert(Array.isArray(idMatrix(1)),"<code>idMatrix(1)</code> should return an array.");'
- text: ''
testString: 'assert.deepEqual(idMatrix(1),results[0],"<code>idMatrix(1)</code> should return <code>"+JSON.stringify(results[0])+"</code>.");'
- text: ''
testString: 'assert.deepEqual(idMatrix(2),results[1],"<code>idMatrix(2)</code> should return <code>"+JSON.stringify(results[1])+"</code>.");'
- text: ''
testString: 'assert.deepEqual(idMatrix(3),results[2],"<code>idMatrix(3)</code> should return <code>"+JSON.stringify(results[2])+"</code>.");'
- text: ''
testString: 'assert.deepEqual(idMatrix(4),results[3],"<code>idMatrix(4)</code> should return <code>"+JSON.stringify(results[3])+"</code>.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function idMatrix (n) {
// Good luck!
}
```
</div>
### After Test
<div id='js-teardown'>
```js
console.info('after the test');
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>