JavaScript Object setPrototypeOf() Method (original) (raw)

Last Updated : 12 Jul, 2024

The **Object.setPrototypeOf() method in JavaScript is a standard built-in object thatthat will sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or null.

**Syntax:

Object.setPrototypeOf(obj, prototype)

**Parameters:

This method accepts two parameters as mentioned above and described below:

• **obj: This parameter is the object that will have its prototype set.
• **Prototype: This parameter is the object’s new prototype. It can be an object or a null object.

**Return value:

• This method returns the specified object.

**Example 1: In this example, we will set a prototype of an object using the Object.setPrototypeOf() Method in JavaScript.

javascript `

let geek1 = { prop1() { return 'Object.isExtensible()'; }, prop2() { return 'JavaScript '; } } let geek2 = { prop3() { return 'Geeksforgeeks'; } }

Object.setPrototypeOf(geek2, geek1);

console.dir(geek2); console.log(geek2.prop3()); console.log(geek2.prop2()); console.log(geek2.prop1());

`

**Output:

"Geeksforgeeks"
"JavaScript "
"Object.isExtensible()"

**Example 2: In this example, we will set a prototype of an object using the Object.setPrototypeOf() Method in JavaScript.

javascript `

let geeks1 = { prop1() { console.log(this.name + ' is Best platform'); }, prop2() { console.log(this.name + ' provide jobs opportunity'); } };

class geeks2 { constructor(name) { this.name = name; } }

Object.setPrototypeOf(geeks2.prototype, geeks1); let result = new geeks2('GeeksforGeeks'); result.prop1(); result.prop2();

`

**Output:

"GeeksforGeeks is Best platform"
"GeeksforGeeks provide jobs opportunity"

We have a complete list of Javascript Object methods, to check those please go through this JavaScript Object Complete Reference article.

**Supported Browsers:

The browsers supported by **Object.setPrototypeOf() method are listed below:

• Google Chrome
• Edge
• Firefox
• Opera
• Safari