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.

Reflect.setPrototypeOf(target, prototype)

target

The target object of which to set the prototype.

prototype

The object's new prototype (an object or null).

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

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

The Reflect.setPrototypeOf method changes the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

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

• Reflect
• Object.setPrototypeOf()