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.
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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.
const target = {};
const proto = Object.create(target);
Reflect.setPrototypeOf(target, proto); // false
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-reflect.setprototypeof |
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