is-prototype-of-x
v2.1.2
Checks if an object exists in another object's prototype chain.
0/weekUpdated 3 years agoMITUnpacked: 41.2 KB
Published by Graham Fairweather
npm install is-prototype-of-x
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is-prototype-of-x
Checks if an object exists in another object's prototype chain.
$3
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
``js
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
``