JavaScript Object setPrototypeOf() Method

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The Object.setPrototypeOf() method in JavaScript is a standard built-in object which 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 which is going to 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.

The below examples illustrate the Object.setPrototypeOf() Method in JavaScript:

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 'Geeksforzambiatek'; 
    } 
} 
  
Object.setPrototypeOf(geek2, geek1); 
  
console.dir(geek2); 
console.log(geek2.prop3()); 
console.log(geek2.prop2()); 
console.log(geek2.prop1());

Output:

"Geeksforzambiatek"
"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 zambiatek1 = { 
    prop1() { 
        console.log(this.name + ' is Best platform'); 
    }, 
    prop2() { 
        console.log(this.name + ' provide jobs opportunity'); 
    } 
}; 
  
class zambiatek2 { 
    constructor(name) { 
        this.name = name; 
    } 
} 
  
Object.setPrototypeOf(zambiatek2.prototype, zambiatek1); 
let result = new zambiatek2('zambiatek'); 
result.prop1(); 
result.prop2();

Output:

"zambiatek is Best platform"
"zambiatek 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 34 and above
Edge 12 and above
Firefox 31 and above
Opera 21 and above
Safari 9 and above

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