Is it possible to destructure onto an existing object? (Javascript ES6)

Question

For example if I have two objects:

var foo = {
  x: \"bar\",
  y: \"baz\"
}

and

var oof = {}

and I want

Answer 1

DRY

var a = {a1:1, a2: 2, a3: 3};
var b = {b1:1, b2: 2, b3: 3};

const newVar = (() => ({a1, a2, b1, b2})).bind({...a, ...b});
const val = newVar();
console.log({...val});
// print: Object { a1: 1, a2: 2, b1: 1, b2: 2 }

or

console.log({...(() => ({a1, a2, b1, b2})).bind({...a, ...b})()});