Web/JavaScript/Reference/Global objects/Reflect/set

The static Reflect.set() method works like setting a property on an object.

Syntax

Reflect.set(target, propertyKey, value[, receiver])

Parameters

target: The target object on which to set the property.
propertyKey: The name of the property to set.
value: The value to set.
receiver Optional: The value of this provided for the call to target if a setter is encountered.

Return value

A Boolean indicating whether or not setting the property was successful.

Exceptions

A TypeError, if target is not an Object.

Description

The Reflect.set method allows you to set a property on an object. It does property assignment and is like the property accessor syntax as a function.

Examples

Using Reflect.set()

// Object
let obj = {} 
Reflect.set(obj, 'prop', 'value')  // true
obj.prop  // "value"

// Array
let arr = ['duck', 'duck', 'duck'] 
Reflect.set(arr, 2, 'goose')  // true
arr[2]  // "goose"

// It can truncate an array.
Reflect.set(arr, 'length', 1)  // true
arr  // ["duck"] 

// With just one argument, propertyKey and value are "undefined".
let obj = {} 
Reflect.set(obj)  // true
Reflect.getOwnPropertyDescriptor(obj, 'undefined') 
// { value: undefined, writable: true, enumerable: true, configurable: true }

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'Reflect.set' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`set`	Chrome Full support 49	Edge Full support 12	Firefox Full support 42	IE No support No	Opera Full support 36	Safari Full support 10	WebView Android Full support 49	Chrome Android Full support 49	Firefox Android Full support 42	Opera Android Full support 36	Safari iOS Full support 10	Samsung Internet Android Full support 5.0	nodejs Full support 6.0.0

Legend

Full support: Full support
No support: No support