ES6 Fundamentos

const obj = { foo: 1 }; 

obj.bar = 2;

const speed = 'quick'; `The ${speed} brown fox jumps over the lazy dog.`

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

(function() {

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

 return [ typeof f, typeof h ];

 })();

[...[...'...']].length

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

typeof (function* f() { yield f })().next().next()

let some_text = "some string"; 

if(some_text.indexOf('str') !=-1){

 return true;

 }

let titleElements = document.querySelectorAll('.article .title') let titles = Array.from(titleElements).map( t => t.textContent ); console.log(titles);

let a = 12, b = 3;

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

const [a, , b] = [1, 2, 3]; 

console.log(a, b);