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

See also

• Reflect
• Object.getOwnPropertyNames()