# Functions

<a id="isundefined"></a>

##  isUndefined

▸ **isUndefined**(value?: *`any`*): `boolean`

*Defined in [is/undefined.ts:19](https://github.com/polkadot-js/common/blob/1e6eb2c/packages/util/src/is/undefined.ts#L19)*

*__name__*: isUndefined

*__summary__*: Tests for a `undefined` values.

*__description__*: Checks to see if the input value is `undefined`.

*__example__*:   

```javascript
import { isUndefined } from '@polkadot/util';

console.log('isUndefined', isUndefined(void(0))); // => true
```

**Parameters:**

| Name | Type |
| ------ | ------ |
| `Optional` value | `any` |

**Returns:** `boolean`

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