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1# is-extendable [![NPM version](https://img.shields.io/npm/v/is-extendable.svg?style=flat)](https://www.npmjs.com/package/is-extendable) [![NPM monthly downloads](https://img.shields.io/npm/dm/is-extendable.svg?style=flat)](https://npmjs.org/package/is-extendable) [![NPM total downloads](https://img.shields.io/npm/dt/is-extendable.svg?style=flat)](https://npmjs.org/package/is-extendable) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/is-extendable.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/is-extendable)
2
3> Returns true if a value is a plain object, array or function.
4
5## Install
6
7Install with [npm](https://www.npmjs.com/):
8
9```sh
10$ npm install --save is-extendable
11```
12
13## Usage
14
15```js
16var isExtendable = require('is-extendable');
17```
18
19Returns true if the value is any of the following:
20
21* array
22* plain object
23* function
24
25## Notes
26
27All objects in JavaScript can have keys, but it's a pain to check for this, since we ether need to verify that the value is not `null` or `undefined` and:
28
29* the value is not a primitive, or
30* that the object is a plain object, function or array
31
32Also note that an `extendable` object is not the same as an [extensible object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible), which is one that (in es6) is not sealed, frozen, or marked as non-extensible using `preventExtensions`.
33
34## Release history
35
36### v1.0.0 - 2017/07/20
37
38**Breaking changes**
39
40* No longer considers date, regex or error objects to be extendable
41
42## About
43
44### Related projects
45
46* [assign-deep](https://www.npmjs.com/package/assign-deep): Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target… [more](https://github.com/jonschlinkert/assign-deep) | [homepage](https://github.com/jonschlinkert/assign-deep "Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target (first) object.")
47* [is-equal-shallow](https://www.npmjs.com/package/is-equal-shallow): Does a shallow comparison of two objects, returning false if the keys or values differ. | [homepage](https://github.com/jonschlinkert/is-equal-shallow "Does a shallow comparison of two objects, returning false if the keys or values differ.")
48* [is-plain-object](https://www.npmjs.com/package/is-plain-object): Returns true if an object was created by the `Object` constructor. | [homepage](https://github.com/jonschlinkert/is-plain-object "Returns true if an object was created by the `Object` constructor.")
49* [isobject](https://www.npmjs.com/package/isobject): Returns true if the value is an object and not an array or null. | [homepage](https://github.com/jonschlinkert/isobject "Returns true if the value is an object and not an array or null.")
50* [kind-of](https://www.npmjs.com/package/kind-of): Get the native type of a value. | [homepage](https://github.com/jonschlinkert/kind-of "Get the native type of a value.")
51
52### Contributing
53
54Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
55
56### Building docs
57
58_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
59
60To generate the readme, run the following command:
61
62```sh
63$ npm install -g verbose/verb#dev verb-generate-readme && verb
64```
65
66### Running tests
67
68Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
69
70```sh
71$ npm install && npm test
72```
73
74### Author
75
76**Jon Schlinkert**
77
78* [github/jonschlinkert](https://github.com/jonschlinkert)
79* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
80
81### License
82
83Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
84Released under the [MIT License](LICENSE).
85
86***
87
88_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on July 20, 2017._
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