Notes on ES6

forof.js

var numbers = ['a', 'b', 'c'];

for(let i of numbers){
  console.log(i); // a b c
}

var users = [{
  firstname: 'jon',
  lastname: 'dem'
},
{
  firstname: 'sophie',
  lastname: 'wang'
}];

for({firstname} of users){
  console.log(firstname); //jon wang
}