# Functions

<a id="isfunction"></a>

##  isFunction

▸ **isFunction**(value: *`any`*): `boolean`

*Defined in [is/function.ts:20](https://github.com/polkadot-js/common/blob/fbd6c1e/packages/util/src/is/function.ts#L20)*

*__name__*: isFunction

*__signature__*: isFunction (value: any): boolean

*__summary__*: Tests for a `function`.

*__description__*: Checks to see if the input value is a JavaScript function.

*__example__*:   

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

isFunction(() => false); // => true
```

**Parameters:**

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

**Returns:** `boolean`

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