@fav/type.is-function

Checks whether a value is a function or not.

"fav" is an abbreviation of "favorite" and also the acronym of "for all versions". This package is intended to support all Node.js versions and many browsers as possible. At least, this package supports Node.js >= v0.10 and major Web browsers: Chrome, Firefox, IE11, Edge, Vivaldi and Safari.

Install

To install from npm:

$ npm install --save @fav/type.is-function

NOTE: npm < 2.7.0 does not support scoped package, but old version Node.js supports it. So when you use such older npm, you should download this package from github.com, and move it in node_modules/@fav/type.is-function/ directory manually.

Usage

For Node.js:

var isFunction = require('@fav/type.is-function');
isFunction(function f() {}); // => true
isFunction.not(function f() {}); // => false

For Web browsers:

<script src="fav.type.is-function.min.js"></script>
<script>
var isFunction = fav.type.isFunction;
isFunction(function f() {}); // => true
isFunction.not(function f() {}); // => false
</script>

API

isFunction(value) : boolean

Checks if value is a function.

Parameter:

| Parameter | Type | Description | |-----------|:------:|-----------------------------| | value | any | The value to be checked. |

Return:

True, if value is a function.

Type: boolean

isFunction.not(value) : boolean

Checks if value is not a function.

This function always returns a negative boolean of isFunction(value).

Parameter:

| Parameter | Type | Description | |-----------|:------:|-----------------------------| | value | any | The value to be checked. |

Return:

True, if value is not a function.

Type: boolean

Checked

Node.js (4〜)

| Platform | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |:---------:|:------:|:------:|:------:|:------:|:------:|:------:|:------:| | macOS |◯|◯|◯|◯|◯|◯|◯| | Windows10 |◯|◯|◯|◯|◯|◯|◯| | Linux |◯|◯|◯|◯|◯|◯|◯|

io.js (1〜3)

| Platform | 1 | 2 | 3 | |:---------:|:------:|:------:|:------:| | macOS |◯|◯|◯| | Windows10 |◯|◯|◯| | Linux |◯|◯|◯|

Node.js (〜0.12)

| Platform | 0.8 | 0.9 | 0.10 | 0.11 | 0.12 | |:---------:|:------:|:------:|:------:|:------:|:------:| | macOS |◯|◯|◯|◯|◯| | Windows10 |◯|◯|◯|◯|◯| | Linux |◯|◯|◯|◯|◯|

Web browsers

| Platform | Chrome | Firefox | Vivaldi | Safari | Edge | IE11 | |:---------:|:------:|:-------:|:-------:|:------:|:------:|:------:| | macOS |◯|◯ |◯ |◯| -- | -- | | Windows10 |◯|◯ |◯ | -- |◯|◯| | Linux |◯|◯ |◯ | -- | -- | -- |

License

Copyright (C) 2017-2018 Takayuki Sato

This program is free software under MIT License. See the file LICENSE in this distribution for more details.