Object Keys
Return an array of an object's own enumerable property names.
Installation
npm install @stdlib/utils-keys
Usage
var objectKeys = require( '@stdlib/utils-keys' );
objectKeys( obj )
Returns an array
of an object's own enumerable property names.
var obj = {
'a': 1,
'b': 2
};
var keys = objectKeys( obj );
Notes
- Name order is not guaranteed, as
object
key enumeration is not specified according to the ECMAScript specification. In practice, however, most engines use insertion order to sort an object
's keys, thus allowing for deterministic extraction. - In contrast to the built-in
Object.keys()
, if provided null
or undefined
, the function returns an empty array
, rather than throwing an error.
Examples
var objectKeys = require( '@stdlib/utils-keys' );
function Foo() {
this.beep = 'boop';
this.a = {
'b': 'c'
};
return this;
}
Foo.prototype.foo = [ 'bar' ];
var obj = new Foo();
var keys = objectKeys( obj );
console.log( keys );
Notice
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
License
See LICENSE.
Copyright
Copyright © 2016-2022. The Stdlib Authors.
0.0.7 (2022-02-16)
No changes reported for this release.
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