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