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"]

var sym = Symbol.for("comet");
var sym2 = Symbol.for("meteor");
var 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

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Reflect.ownKeys' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Reflect.ownKeys' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 49 42 (42) No support No support 10
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 49 42.0 (42) No support No support 10

See also

Document Tags and Contributors

 Contributors to this page: bsara, eduardoboucas, gingerik, fscholz, ziyunfei
 Last updated by: bsara,