JS: Object.setPrototypeOf

New in ES2015.

Object.setPrototypeOf ( obj, proto )

Set the parent of obj to proto.

let a = {};
let b = Object.create (a);

// b's parent is a
console.log ( Object.getPrototypeOf ( b ) === a ); // true

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

// returns b itself, with the new parent
console.log ( cc === b ); // true

// b has new parent
console.log ( Object.getPrototypeOf ( b ) === Array ); // true

〔►see JS: Prototype and Inheritance〕

〔►see JS: Find Object's Prototype〕

Reference

ECMAScript® 2016 Language Specification#sec-object.setprototypeof