JavaScript: Object.setPrototypeOf

By Xah Lee. Date: . Last updated: .

New in JS2015.

Object.setPrototypeOf( obj, parent )
Set the parent of obj to parent. Return the changed obj. 
let aa = {};
let bb = Object.create (aa);

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

[see Prototype and Inheritance]

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