[license-shield-url]: https://img.shields.io/github/license/typeforce-js/is-function.svg?style=flat-square
[license-url]: https://github.com/Typeforce-JS/is-function/blob/master/LICENSE
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[npm-url]: https://www.npmjs.com/package/@typeforce/is-function
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[unpkg-url]: https://unpkg.com/@typeforce/is-function/dist/index.min.js

is-function

[![NPM][npm-version-shield-url]][npm-url]
[![NPM][npm-downloads-shield-url]][npm-url]
[![CDN][unpkg-shield-url]][unpkg-url]
[![LICENSE][license-shield-url]][license-url]

Determine if a value is a function.

A value is a function if it is a literal function, or is an instance of type
Function.

Usage

``shell
npm install @typeforce/is-function --save # Install package via NPM
`

`javascript
import { expect } from "chai";
import isFunction from "@typeforce/is-function";

expect(isFunction(function () {})).to.be.true;
expect(isFunction(() => {})).to.be.true;
expect(isFunction(new Function())).to.be.true;

expect(isFunction(undefined)).to.be.false;
expect(isFunction(null)).to.be.false;
expect(isFunction(42).to.be.false;
`

This package contains TypeScript type declarations. Furthermore, the package
uses TypeScript type guards to allow type inference to influence IntelliSense.

`typescript
if (isFunction(x)) {
// IntelliSense now knows x is a function.
let y: Function = x;
}
`

$3

This package can be imported via unpkg as demonstrated
below.

`html


`

Build & Test

When building the project, a folder named dist/ will be created if it does not
already exist, where the compiled code will be outputted to. Type declaration
files will also be generated and outputted to the dist/ folder.

A minified Javascript version of the entire project will be generated and
outputted to dist/index.min.js.

`shell
npm install # Installs dependencies.
npm run build # Build the project.
`

This package uses Gulp for building, and Chai
and Mocha for testing.

`shell
npm test # Run tests.
`

License

Refer to the LICENSE` file for license information.