Object.getPrototypeOf() - JavaScript | MDN
Try it
const prototype = {};
const object = Object.create(prototype);
console.log(Object.getPrototypeOf(object) === prototype);
// Expected output: true
Syntax
js
Object.getPrototypeOf(obj)
Parameters
obj-
The object whose prototype is to be returned.
Return value
The prototype of the given object, which may be null.
Examples
Using getPrototypeOf
js
const proto = {};
const obj = Object.create(proto);
Object.getPrototypeOf(obj) === proto; // true
Non-object coercion
In ES5, it will throw a TypeError exception if the obj
parameter isn't an object. In ES2015, the parameter will be coerced to an
Object.
js
Object.getPrototypeOf("foo");
// TypeError: "foo" is not an object (ES5 code)
Object.getPrototypeOf("foo");
// String.prototype (ES2015 code)
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-object.getprototypeof |