W3cubDocs

/JavaScript

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 [[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 [[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

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
setPrototypeOf 49 12 42 No 36 10
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
setPrototypeOf 49 49 42 36 10 5.0
Server
Node.js
setPrototypeOf 6.0.0

See also

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