30-seconds-of-code/snippets/isUndefined.md

A collection of useful JavaScript snippets.

### isUndefined

Returns `true` if the specified value is `undefined`, `false` otherwise.

Use the strict equality operator to check if the value and of `val` are equal to `undefined`.

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

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