Shorthand Assignment Notation

ECMAScript-2015 introduces a shorthand syntax for the assignment of object literals.

var a = 10;
var b = 20;
var o = {a, b};   // {a:a,b:b}
console.log(o);

var a = 10;
var b = 20;
var o = {a, b};   // {a:a,b:b}
console.log(o);

{a: 10, b: 20}