Javascript Object.getPrototypeOf()

The syntax of the getPrototypeOf() method is:

Object.getPrototypeOf(obj)

The getPrototypeOf() method, being a static method, is called using the Object class name.

getPrototypeOf() Parameters

The getPrototypeOf() method takes in:

• obj - The object whose prototype is to be returned.

Return value from getPrototypeOf()

• Returns prototype of the given object.
• Returns null If there are no inherited properties.

Example: Using Object.getPrototypeOf()

let proto = {};
let obj = Object.create(proto);

console.log(Object.getPrototypeOf(obj) === proto); // true

console.log(Object.getPrototypeOf("JavaScript"));

// function
let func1 = function () {};

// creating object from function
let object1 = Object.create(func1);

console.log(Object.getPrototypeOf(func1) === Object.getPrototypeOf(object1)); // false

// Object.create() creates object with given object as prototype
console.log(func1 === Object.getPrototypeOf(object1)); // true

Output

true
String {"", constructor: ƒ, anchor: ƒ, big: ƒ, blink: ƒ, …}
false
true

Recommended Reading: Javascript Object setPrototypeOf()