object-keys

What is object-keys?

The object-keys npm package is a utility that provides a shim for the Object.keys method, which returns an array of a given object's own enumerable property names. It is particularly useful for environments that do not support the native Object.keys method, such as older versions of JavaScript engines.

What are object-keys's main functionalities?

Shim for Object.keys

Provides a cross-browser implementation of Object.keys to retrieve the keys of an object.

var keys = require('object-keys');
var obj = { a: 1, b: 2, c: 3 };
console.log(keys(obj)); // ['a', 'b', 'c']

Other packages similar to object-keys

lodash.keys

Lodash is a popular utility library that includes a method called _.keys, which is similar to object-keys. It provides a more robust solution for getting the keys of an object, handling edge cases and supporting a wider range of environments, but it is part of a larger library which may be more than needed if only this functionality is required.

core-js

Core-js is a modular standard library for JavaScript, which includes polyfills for many ECMAScript features. It offers a polyfill for Object.keys, among many other features. It is more comprehensive than object-keys, but also larger in size, which might not be ideal for projects looking to minimize dependencies.

README

#object-keys

An Object.keys shim. Invoke its "shim" method to shim Object.keys if it is unavailable.

Most common usage:

var keys = Object.keys || require('object-keys');

Example

var keys = require('object-keys');
var assert = require('assert');
var obj = {
	a: true,
	b: true,
	c: true
};

assert.deepEqual(keys(obj), ['a', 'b', 'c']);

var keys = require('object-keys');
var assert = require('assert');
/* when Object.keys is not present */
delete Object.keys;
var shimmedKeys = keys.shim();
assert.equal(shimmedKeys, keys);
assert.deepEqual(Object.keys(obj), keys(obj));

var keys = require('object-keys');
var assert = require('assert');
/* when Object.keys is present */
var shimmedKeys = keys.shim();
assert.equal(shimmedKeys, Object.keys);
assert.deepEqual(Object.keys(obj), keys(obj));

Source

Implementation taken directly from es5-shim, with modifications, including from lodash.

Tests

Simply clone the repo, npm install, and run npm test