---
title: Value is undefined
type: snippet
tags: [type]
cover: peaches
dateModified: 2020-10-20T23:02:01+03:00
---

Checks if the specified value is `undefined`.

- Use the strict equality operator to check if `val` is equal to `undefined`.

```js
const isUndefined = val => val === undefined;
```

```js
isUndefined(undefined); // true
```