JS: Object.setPrototypeOf

By Xah Lee. Date: . Last updated: .

New in ES2015.

Object.setPrototypeOf ( obj, proto )

Set the parent of obj to proto.

Return the changed obj.

let aa = {};
let bb = Object.create (aa);

// bb's parent is aa
console.log ( Object.getPrototypeOf ( bb ) === aa ); // true

// now change parent
let cc = Object.setPrototypeOf ( bb, Array );

// return value is the new bb
console.log ( cc === bb ); // true
console.log ( Object.getPrototypeOf ( bb ) === Array ); // true

[see JS: Prototype and Inheritance]

[see JS: Find Object's Prototype]

Reference

ECMAScript® 2016 Language Specification#sec-object.setprototypeof

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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