JavaScript Object.getPrototypeOf() Method

The Object.getPrototypeOf() method of JavaScript returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

Syntax:

Parameter

obj: It is an object whose prototype is to be returned.

Return value:

This method returns the prototype of the given object. If there are no inherited properties, this method will return null.

Browser Support:

Chrome	5
Edge	Yes
Firefox	3.5
Opera	12.1

Example 1

let animal = {
  eats: true
};
   // create a new object with animal as a prototype
let rabbit = Object.create(animal);
alert(Object.getPrototypeOf(rabbit) === animal); // get the prototype of rabbit

Object.setPrototypeOf(rabbit, {}); // change the prototype of rabbit to {}

Output:

true

Example 2

const prototype1 = {};
const object1 = Object.create(prototype1);
const prototype2 = {};
const object2 = Object.create(prototype2);
console.log(Object.getPrototypeOf(object1) === prototype1);
console.log(Object.getPrototypeOf(object1) === prototype2); 

Output:

true
false

Example 3

const prototype1 = {};
const object1 = Object.create(prototype1);
const prototype2 = {};
const object2 = Object.create(prototype2);
console.log(Object.getPrototypeOf(object1) === prototype1);
console.log(Object.getPrototypeOf(object2) === prototype2); 

Output: