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
- 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
Objectconstructor. | 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
License
Copyright © 2017, Jon Schlinkert. Released under the MIT License.
This file was generated by verb-generate-readme, v0.6.0, on July 20, 2017.