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