ES6 Grundlagen

const obj = { foo: 1 }; 

obj.bar = 2;

function mystery(...params) {

  return params; 

}

let a = mystery(1,23,4);

let x, { x: y = 1 } = { x }; y;

(function() {

 let f = this ? class g { } : class h { };

 return [ typeof f, typeof h ];

 })();

typeof (new (class F extends (String, Array) { })).substring

(function() { 

if (false) {

 let f = { g() => 1 };

 }

 return typeof f;

 })()

const PI = 3.14; 

console.log(PI) // Gibt 3.14 aus

let a = 12, b = 3;

[a, b] = [b, a];