////////////////////////////////////////
// Lecture 101: Arrays in es6/es2015

const boxes = document.querySelectorAll('.box');

//ES5
/*
var boxesArr5 = Array.prototype.slice.call(boxes);
boxesArr5.forEach(function(cur) {
    cur.style.backgroundColor = 'dodgerblue';
});
*/
Array.from(boxes).forEach(cur => cur.style.backgroundColor = 'dodgerblue');