is-prototype-of-x

is-prototype-of-x

Checks if an object exists in another object's prototype chain.

module.exports(proto, object) ⇒ boolean ⏏

This method checks if an object exists in another object's prototype chain.

Kind: Exported function
Returns: boolean - Does the proto object lay in the prototype chain of object.
Throws:

• TypeError If proto is undefined or null.

Param	Type	Description
proto	Object	The proto object to search for.
object	Object	The object whose prototype chain will be searched.

Example

import isPrototypeOf from 'is-prototype-of-x';
 
function Foo() {}
function Bar() {}
function Baz() {}
 
Bar.prototype = Object.create(Foo.prototype);
Baz.prototype = Object.create(Bar.prototype);
 
const baz = new Baz();
 
console.log(isPrototypeOf(Baz.prototype, baz)); // true
console.log(isPrototypeOf(Bar.prototype, baz)); // true
console.log(isPrototypeOf(Foo.prototype, baz)); // true
console.log(isPrototypeOf(Object.prototype, baz)); // true