Maccauhuru

//immediately prints the value 'welcome to the jungle'
(function(){
  return "Welcome to the jungle!";
})(); 

Maccauhuru

//This variable holds/stores a function that prints 'welcome to the jungle'
const welcomeMessageVariable = function (){
                               return "Welcome to the jungle!";
                               };

//we will invoke our first variable here below
welcomeMessageVariable(); // Welcome to the jungle!


//This second variable holds/stores the value 'welcome to the jungle'

Maccauhuru

const greetingMessageIIFE = (function(name,message){
                            let headline = `Lets create some IIFE's`;
                              return `${headline}
                                      Hello ${name},${message}`
                           })('Neo',"Welcome to the Matrix!"); 

//Lets create some IIFE's
//Hello Neo,Welcome to the Matrix!

Maccauhuru

//This function is 'impure' and is not re-usable
function addNumbers(){
  let num1 = 100;
  let num2 = 1;
  return num1 + num2;
}

addNumbers();//will always return 101

Maccauhuru

//lets define an object called book
const book = {};

//lets add two properties to our book object
book.name = "Eloquent JavaScript: A Modern Introduction to Programming";
book.author = "Marijn Haverbeke"

//lets define a method to get the book details
book.getBookDetails = function (){
return "The book " + this.name + " was written by " + this.author;

Maccauhuru

//define Book as an object constructor function
function Book(name,author) {
  this.name = name;
  this.author = author;
  this.getBookDetails = function (){
  return "The book " + this.name + " was written by " + this.author;
  }
}

//add some new books

Maccauhuru

//define Book as an object constructor function
function Book(name,author) {
  this.name = name;
  this.author = author;
}
//add getBookDetails method to object prototype
Book.prototype.getBookDetails = function (){
  return `The book ${this.name} was written by ${this.author}`;
}

Maccauhuru

//define Book as an object constructor function
class Book {
constructor(name,author,price){
 this.name = name;
 this.author = author;
 this.price = price;
}
getBookCost(){
  return `The book ${this.name} was written by ${this.author} and costs $${this.price}`;
     }

Maccauhuru

const movie = {
  name : "The Godfather",
  year : 1972,
  director: 'Francis Ford Coppola',
  imdb_Rating: 9.2,
  get movieDetails(){
    return `
    The movie : '${this.name}' was directed by ${this.director} and released in the year ${this.year}.
    It has a very high IMDB Rating of ${this.imdb_Rating} / 10.
   `

Maccauhuru

const movie = {
  name : "The Godfather",
  year : 1972,
  director: 'Francis Ford Coppola',
  imdb_Rating: 9.2,
  set actors(name) {
    this.cast.push(name);
  },
  cast: [],
  get movieDetails(){