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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 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

License

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

README.md