# is-function-x

> Determine whether a given value is a function object.

Latest version **4.1.2** (published 2019-08-28) · MIT license · 0 weekly downloads

## Install

```sh
npm install is-function-x
pnpm add is-function-x
yarn add is-function-x
bun add is-function-x
```

## Health

**Score 20/100 (F)** — status: abandoned.

Positive: esm support; no vulnerabilities.

Warnings: low downloads; no types.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 4.1.2 |
| Published | 2019-08-28 |
| First published | 2016-01-20 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | ESM + CommonJS |
| Node | >=8.11.4 |
| Dependencies | 8 |
| Unpacked size | 183.3 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 2 |
| Author | Graham Fairweather |
| Maintainers | xotic750 |
| Keywords | Function, isFunction, module, javascript, nodejs, browser |

## Links

- npm: https://www.npmjs.com/package/is-function-x
- Repository: https://github.com/Xotic750/is-function-x
- Issues: https://github.com/Xotic750/is-function-x/issues
- npm.io page: https://npm.io/package/is-function-x

## Dependencies (8)

- [attempt-x](https://npm.io/package/attempt-x.md) ^2.1.2
- [to-boolean-x](https://npm.io/package/to-boolean-x.md) ^2.1.1
- [is-primitive-x](https://npm.io/package/is-primitive-x.md) ^1.0.1
- [to-string-tag-x](https://npm.io/package/to-string-tag-x.md) ^2.1.2
- [normalize-space-x](https://npm.io/package/normalize-space-x.md) ^4.1.2
- [replace-comments-x](https://npm.io/package/replace-comments-x.md) ^3.1.2
- [simple-methodize-x](https://npm.io/package/simple-methodize-x.md) ^1.0.4
- [has-to-string-tag-x](https://npm.io/package/has-to-string-tag-x.md) ^2.1.2

## Alternatives

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## Recent versions

- 4.1.2 (latest) — 2019-08-28
- 4.1.1 — 2019-08-20
- 4.1.0 — 2019-08-14
- 4.0.28 — 2019-07-31
- 4.0.27 — 2019-07-27
- 4.0.26 — 2019-07-27
- 4.0.25 — 2019-07-26
- 4.0.24 — 2019-07-25
- 4.0.23 — 2019-07-24
- 4.0.22 — 2019-07-24
- 4.0.21 — 2019-07-23
- 4.0.20 — 2019-07-22
- 4.0.19 — 2019-07-21
- 4.0.18 — 2019-07-19
- 4.0.17 — 2019-07-18
- … 34 more at https://npm.io/package/is-function-x/versions

## README

<a
  href="https://travis-ci.org/Xotic750/is-function-x"
  title="Travis status">
<img
  src="https://travis-ci.org/Xotic750/is-function-x.svg?branch=master"
  alt="Travis status" height="18">
</a>
<a
  href="https://david-dm.org/Xotic750/is-function-x"
  title="Dependency status">
<img src="https://david-dm.org/Xotic750/is-function-x/status.svg"
  alt="Dependency status" height="18"/>
</a>
<a
  href="https://david-dm.org/Xotic750/is-function-x?type=dev"
  title="devDependency status">
<img src="https://david-dm.org/Xotic750/is-function-x/dev-status.svg"
  alt="devDependency status" height="18"/>
</a>
<a
  href="https://badge.fury.io/js/is-function-x"
  title="npm version">
<img src="https://badge.fury.io/js/is-function-x.svg"
  alt="npm version" height="18">
</a>
<a
  href="https://www.jsdelivr.com/package/npm/is-function-x"
  title="jsDelivr hits">
<img src="https://data.jsdelivr.com/v1/package/npm/is-function-x/badge?style=rounded"
  alt="jsDelivr hits" height="18">
</a>
<a
  href="https://bettercodehub.com/results/Xotic750/is-function-x"
  title="bettercodehub score">
<img src="https://bettercodehub.com/edge/badge/Xotic750/is-function-x?branch=master"
  alt="bettercodehub score" height="18">
</a>
<a
  href="https://coveralls.io/github/Xotic750/is-function-x?branch=master"
  title="Coverage Status">
<img src="https://coveralls.io/repos/github/Xotic750/is-function-x/badge.svg?branch=master"
  alt="Coverage Status" height="18">
</a>

<a name="module_is-function-x"></a>

## is-function-x

Determine whether a given value is a function object.

<a name="exp_module_is-function-x--module.exports"></a>

### `module.exports(value, [allowClass])` ⇒ <code>boolean</code> ⏏

Checks if `value` is classified as a `Function` object.

**Kind**: Exported function  
**Returns**: <code>boolean</code> - Returns `true` if `value` is correctly classified,
else `false`.

| Param        | Type                 | Default            | Description                    |
| ------------ | -------------------- | ------------------ | ------------------------------ |
| value        | <code>\*</code>      |                    | The value to check.            |
| [allowClass] | <code>boolean</code> | <code>false</code> | Whether to filter ES6 classes. |

**Example**

```js
import isFunction from 'is-function-x';

console.log(isFunction()); // false
console.log(isFunction(Number.MIN_VALUE)); // false
console.log(isFunction('abc')); // false
console.log(isFunction(true)); // false
console.log(isFunction({name: 'abc'})); // false
console.log(isFunction(function() {})); // true
console.log(isFunction(new Function())); // true
console.log(isFunction(function* test1() {})); // true
console.log(isFunction(function test2(a, b) {})); // true
console.log(isFunction(async function test3() {})); // true
console.log(isFunction(class Test {})); // false
console.log(isFunction(class Test {}, true)); // true
console.log(
  isFunction((x, y) => {
    return this;
  }),
); // true
```

---
_Source: https://npm.io/package/is-function-x · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._