W3cubDocs

/JavaScript

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

// Array
var 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".
var obj = {};
Reflect.set(obj); // true
Reflect.getOwnPropertyDescriptor(obj, 'undefined');
// { value: undefined, writable: true, enumerable: true, configurable: true }

Specifications

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 49 12 42 No 36 10
Feature Android webview Chrome for Android Edge mobile Firefox for Android Opera Android iOS Safari Samsung Internet
Basic support 49 49 Yes 42 36 10 ?

See also

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