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is-extendable

> Returns true if a value is a plain object, array or function.

# Install

Install with npm:

$ npm install --save is-extendable

# Usage

var isExtendable = require('is-extendable');

Returns true if the value is any of the following:

- array
- plain object
- function

# 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 a plain object, function or array

Also note that an `extendable` object is not the same as an extensible object, which is one that (in es6) is not sealed, frozen, or marked as non-extensible using `preventExtensions`.

# Release history

## v1.0.0 - 2017/07/20

Breaking changes

- No longer considers date, regex or error objects to be extendable

# About

## Related projects

- assign-deep: Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target… more | [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.")
- is-equal-shallow: Does a shallow comparison of two objects, returning false if the keys or values differ. | homepage
- is-plain-object: Returns true if an object was created by the `Object` constructor. | homepage
- isobject: Returns true if the value is an object and not an array or null. | homepage
- kind-of: Get the native type of a value. | homepage

## Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

## Building docs

_(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)_

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

## Running tests

Running 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:

$ npm install && npm test

## Author

Jon Schlinkert

- github/jonschlinkert
- twitter/jonschlinkert

## License

Copyright © 2017, Jon Schlinkert. Released under the [MIT License](LICENSE).

This file was generated by verb-generate-readme, v0.6.0, on July 20, 2017.