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

Readme

Source

#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

Keywords

FAQs

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Last updated on 07 Apr 2019

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