freeCodeCamp/curriculum/challenges/arabic/02-javascript-algorithms-an.../es6/write-arrow-functions-with-...

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---
id: 587d7b88367417b2b2512b44
title: Write Arrow Functions with Parameters
challengeType: 1
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'getUserInput => assert(!getUserInput("index").match(/var/g), "User did replace <code>var</code> keyword.");'
- text: ''
testString: 'getUserInput => assert(getUserInput("index").match(/const\s+myConcat/g), "<code>myConcat</code> should be a constant variable (by using <code>const</code>).");'
- text: ''
testString: 'assert(typeof myConcat === "function", "<code>myConcat</code> should be a function");'
- text: ''
testString: 'assert(() => { const a = myConcat([1], [2]); return a[0] == 1 && a[1] == 2; }, "<code>myConcat()</code> returns the correct <code>array</code>");'
- text: ''
testString: 'getUserInput => assert(!getUserInput("index").match(/function/g), "<code>function</code> keyword was not used.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
var myConcat = function(arr1, arr2) {
"use strict";
return arr1.concat(arr2);
};
// test your code
console.log(myConcat([1, 2], [3, 4, 5]));
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>