Web/JavaScript/Reference/Global objects/Reflect/setPrototypeOf

The static Reflect.setPrototypeOf() method is the same method as Object.setPrototypeOf(), except for its return type. It sets the prototype (i.e., the internal Web/JavaScript/Reference/Global objects/Reflect/Prototype property) of a specified object to another object or to null, and returns true if the operation was successful, or false otherwise.

Syntax

Reflect.setPrototypeOf(target, prototype)

Parameters

target: The target object of which to set the prototype.
prototype: The object's new prototype (an object or null).

Return value

A Boolean indicating whether or not the prototype was successfully set.

Exceptions

A TypeError, if target is not an Object or if prototype is neither an object nor null.

Description

The Reflect.setPrototypeOf method changes the prototype (i.e. the value of the internal Web/JavaScript/Reference/Global objects/Reflect/Prototype property) of the specified object.

Examples

Using Reflect.setPrototypeOf()

Reflect.setPrototypeOf({}, Object.prototype)  // true

// It can change an object's [[../Prototype]] to null.
Reflect.setPrototypeOf({}, null)  // true

// Returns false if target is not extensible.
Reflect.setPrototypeOf(Object.freeze({}), null)  // false

// Returns false if it cause a prototype chain cycle.
let target = {}
let proto = Object.create(target) 
Reflect.setPrototypeOf(target, proto)  // false

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'Reflect.setPrototypeOf' 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
`setPrototypeOf`	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