JS: Find Object's Prototype

By Xah Lee. Date: . Last updated: .

You can use the following ways to find a object's parent, or check if a object is in another's prototype chain.


Return the object's parent object.

[see JS: Object.getPrototypeOf]

Reflect.getPrototypeOf, (ES2015)

Return the object's parent object.

[see JS: Reflect.getPrototypeOf]

Value Property __proto__, (ES2015)

Value is the parent object.

let myArray = [4,6];
console.log( Object.getPrototypeOf (myArray)  === myArray.__proto__ ); // true

ECMAScript® 2016 Language Specification#sec-additional-properties-of-the-object.prototype-object


Return true if object is in prototype chain of another object.

[see JS: Object.prototype.isPrototypeOf]

Object and Inheritance Topic

  1. JS: Object System Overview
  2. JS: What's Object?
  3. JS: Prototype and Inheritance
  4. JS: Create Object
  5. JS: Object Literal Expression
  6. JS: Find Object's Prototype
  7. JS: Set Object's Prototype
  8. JS: How to Create Object with Parent X?
  9. JS: Prevent Adding Property
  10. JS: Determine Type of Object
  11. JS: Primitive Value Object Wrapper
  12. JS: Clone, Deep Copy Object/Array
  13. JS: Test Equality of Objects

  1. JS: Object Object
  2. JS: Object.prototype
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