kingstenbanh

typeof null // object (bug in the language)

kingstenbanh

typeof null // object (bug in the language)

kingstenbanh

var array = ['a', 'b', 'c', 'd', 'e']; 
delete array[2]; 
console.log(array[2]); // undefined

kingstenbanh

var meals = function (breakfast, lunch, dinner, midnightSnack) { 
  console.log('Breakfast is ' + breakfast); 
  console.log('Lunch is ' + lunch); 
  console.log('Dinner is ' + dinner); 
  console.log('Midnight snack is ' + midnightSnack); 
} 

meals('Pancakes', 'Burritos', 'Pork Chop'); 
// Breakfast is pancakes 
// Lunch is burritos 

kingstenbanh

var noReturn = (function() { })(); // undefined 
var returnNoValue = (function( { return; })(); // undefined 
var returnOne = (function( { return 1; })(); // 1

kingstenbanh

var mySkills = ['JavaScript', 'jQuery']; 
var JavaScript = skills[0]; // 'JavaScript' 
var jQuery = skills[1]; // 'jQuery' 
var fly = skills[2]; // undefined

kingstenbanh

unDeclared; // Reference Error: unDeclared is not defined var noValueDefined; // undefined

kingstenbanh

window.hasOwnProperty(undefined); // true

kingstenbanh

typeof undefined // undefined

kingstenbanh

android