19 lines
370 B
Markdown
19 lines
370 B
Markdown
---
|
|
title: isNil
|
|
tags: type,beginner
|
|
---
|
|
|
|
Returns `true` if the specified value is `null` or `undefined`, `false` otherwise.
|
|
|
|
Use the strict equality operator to check if the value of `val` is equal to `null` or `undefined`.
|
|
|
|
```js
|
|
const isNil = val => val === undefined || val === null;
|
|
```
|
|
|
|
```js
|
|
isNil(null); // true
|
|
isNil(undefined); // true
|
|
isNil(''); // false
|
|
```
|