---
title: Value is function
tags: type,function
cover: boulder-beach
firstSeen: 2017-12-17T17:55:51+02:00
lastUpdated: 2020-09-15T16:28:04+03:00
---

Checks if the given argument is a function.

- Use `typeof` to check if a value is classified as a function primitive.

```js
const isFunction = val => typeof val === 'function';
```

```js
isFunction('x'); // false
isFunction(x => x); // true
```