The **`Object.setPrototypeOf()` method** sets the prototype of one object to another or `null`. The `setPrototypeOf()` method is declared as follows:
```js
Object.setPrototypeOf(obj, prototype)
```
* **`obj`**: The object whose prototype is set.
* **`prototype`**: The prototype that is set of `obj`.


# Return value
The `setPrototypeOf()` method returns an object `obj` with prototype `prototype`.

> Note: If `obj` is non-extensible, `TypeError` is thrown.

# Browser compatibility
The `setPrototypeOf()` method is supported by the following browsers:






# Code
Consider the code snippet below, which demonstrates the use of the `setPrototypeOf()` method:

var shape = { 
  property1(){
    return 'I am a shape'
  }  
}
var triangle = { 
  property2(){
    return 'I am a triangle'
  }  
}

Object.setPrototypeOf(triangle, shape)

console.log("triangle says: ", triangle.property1())
console.log("triangle says: ", triangle.property2())

# Explanation
* An object `shape` is declared with `property1()` in *line 1*.
* An object `triangle` is declared with `property2()` in *line 6*.
* The prototype of `shape` is set to prototype of `triangle` using the `setPrototypeOf()` method in *line 12*.
* `property1()` is called from `triangle` in *line 14*, which was the prototype of `shape`.


What is Object.setPrototypeOf() in JavaScript?

Sets an object's prototype to another object or null, returning the object. Error if non-extensible.