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Reflect.ownKeys

The static Reflect.ownKeys() method returns an array of the target object's own property keys.

Syntax

Reflect.ownKeys(target)

Parameters

target
The target object from which to get the own keys.

Return value

An Array of the target object's own property keys.

Exceptions

A TypeError, if target is not an Object.

Description

The Reflect.ownKeys method returns an array of the target object's own property keys. Its return value is equivalent to Object.getOwnPropertyNames(target).concat(Object.getOwnPropertySymbols(target)).

Examples

Using Reflect.ownKeys()

Reflect.ownKeys({z: 3, y: 2, x: 1})  // [ "z", "y", "x" ]
Reflect.ownKeys([])                  // ["length"]

let sym = Symbol.for('comet')
let sym2 = Symbol.for('meteor')
let obj = {[sym]: 0, 'str': 0, '773': 0, '0': 0,
           [sym2]: 0, '-1': 0, '8': 0, 'second str': 0} 
Reflect.ownKeys(obj) 
// [ "0", "8", "773", "str", "-1", "second str", Symbol(comet), Symbol(meteor) ]
// Indexes in numeric order, 
// strings in insertion order, 
// symbols in insertion order

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
ownKeys 49 12 42 No 36 10
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
ownKeys 49 49 42 36 10 5.0
Server
Node.js
ownKeys 6.0.0

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys