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- # is-extendable [![NPM version](https://badge.fury.io/js/is-extendable.svg)](http://badge.fury.io/js/is-extendable)
-
- > Returns true if a value is any of the object types: array, regexp, plain object, function or date. This is useful for determining if a value can be extended, e.g. "can the value have keys?"
-
- ## Install
-
- Install with [npm](https://www.npmjs.com/)
-
- ```sh
- $ npm i is-extendable --save
- ```
-
- ## Usage
-
- ```js
- var isExtendable = require('is-extendable');
- ```
-
- Returns true if the value is any of the following:
-
- * `array`
- * `regexp`
- * `plain object`
- * `function`
- * `date`
- * `error`
-
- ## Notes
-
- All 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:
-
- * the value is not a primitive, or
- * that the object is an `object`, `function`
-
- Also 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`.
-
- ## Related projects
-
- * [assign-deep](https://github.com/jonschlinkert/assign-deep): Deeply assign the enumerable properties of source objects to a destination object.
- * [extend-shallow](https://github.com/jonschlinkert/extend-shallow): Extend an object with the properties of additional objects. node.js/javascript util.
- * [isobject](https://github.com/jonschlinkert/isobject): Returns true if the value is an object and not an array or null.
- * [is-plain-object](https://github.com/jonschlinkert/is-plain-object): Returns true if an object was created by the `Object` constructor.
- * [is-equal-shallow](https://github.com/jonschlinkert/is-equal-shallow): Does a shallow comparison of two objects, returning false if the keys or values differ.
- * [kind-of](https://github.com/jonschlinkert/kind-of): Get the native type of a value.
-
- ## Running tests
-
- Install dev dependencies:
-
- ```sh
- $ npm i -d && npm test
- ```
-
- ## Contributing
-
- Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/is-extendable/issues/new)
-
- ## Author
-
- **Jon Schlinkert**
-
- + [github/jonschlinkert](https://github.com/jonschlinkert)
- + [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
-
- ## License
-
- Copyright © 2015 Jon Schlinkert
- Released under the MIT license.
-
- ***
-
- _This file was generated by [verb-cli](https://github.com/assemble/verb-cli) on July 04, 2015._
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