Spread operator

Spreads an array into its individual values.

var a = [1, 2];
var b = returnTwo(a[0], a[1]); // [2, 1]
var c = returnTwo(...a); // [2, 1]

concat arrays with spread

let nums = [1, 2, 3];
let abcs = ['a', 'b', 'c'];
let alphanum = [ ...nums, ...abs ]; // [1, 2, 3, 'a', 'b', 'c']

Object.assign shorthand

• This is a proposal by Sebastian Markbage
• serves as a shorthand for Object.assign

const o = {num: 0, txt: 'hi'};
const newO = {...o, num: 1};