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.
Try it
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
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
Specification |
---|
ECMAScript Language Specification # sec-reflect.setprototypeof |
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