freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/es6/write-arrow-functions-with-parameters/index.md

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title: Write Arrow Functions with Parameters
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# Write Arrow Functions with Parameters

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## Problem Explanation
Here is a [cool resource about anonymous functions in JavaScript](http://helephant.com/2008/08/23/javascript-anonymous-functions/), in case you are still wondering what they are, and their role.

Now, you are tasked at putting parameters inside arrow functions. 


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## Hints

### Hint 1

Get rid of the `function` keyword. Put the arrow operator.

### Hint 2

Make sure you changed the `var` to a `const`.



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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript
const myConcat = (arr1, arr2) => {
  "use strict";
  return arr1.concat(arr2);
};
// test your code
console.log(myConcat([1, 2], [3, 4, 5]));
```

</details>