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

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---
title: Factorial
id: 597b2b2a2702b44414742771
challengeType: 5
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'assert(typeof factorial === "function", "<code>factorial</code> is a function.");'
- text: ''
testString: 'assert(typeof factorial(2) === "number", "<code>factorial(2)</code> should return a number.");'
- text: ''
testString: 'assert.equal(factorial(3),results[0],"<code>factorial(3)</code> should return 6.");'
- text: ''
testString: 'assert.equal(factorial(5),results[1],"<code>factorial(3)</code> should return 120.");'
- text: ''
testString: 'assert.equal(factorial(10),results[2],"<code>factorial(3)</code> should return 3,628,800.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function factorial (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>