ferreiratiago

function* myGenerator() {
  var array = [1, 2];

  while (array.length) {
    yield array.shift();
  }
}

var generator = myGenerator();
console.log(generator.next()); // { value: 1, done: false }

ferreiratiago

function myIterator() {
  var array = [1, 2];
  return {
    next: function() {
      if (array.length) {
        return {
          value: array.shift(),
          done: false
        };
      } else {

ferreiratiago

function myIterator() {
  var array = [1, 2];
  return {
    next: function() {
      if (array.length) {
        return {
          value: array.shift(),
          done: false
        };
      } else {

ferreiratiago

typeof undefined  // 'undefined'
typeof null       // 'object'

ferreiratiago

({}).toString() // '[object Object]'
[].toString()   // ''

ferreiratiago

({}).valueOf()  // {}
[].valueOf()    // []

ferreiratiago

[1,2,3].slice(0, null)         // []
[1,2,3].slice(0, undefined)    // [1,2,3]

ferreiratiago

> 0.1.toString(2)
'0.0001100110011001100110011001100110011001100110011001101'

> 0.2.toString(2)
'0.001100110011001100110011001100110011001100110011001101'

ferreiratiago

'0'.charCodeAt(0)       // 48
'2'.charCodeAt(0)       // 50
'10'.charCodeAt(0)      // 49

ferreiratiago

var example = { length: 3 } // An array-like object

// When executing 'Array.apply(null, example)'
// Array will be executed with its arguments being the properties' values from 0...length - 1
Array(example[0], example[1], example[2]) 

// Which translates into
Array(undefined, undefined, undefined) // [ undefined, undefined, undefined ]