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

//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

//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

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 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

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

Maccauhuru

//syntax for creating an IIFE

(function () {
   //functions statements go here
})();

Maccauhuru

//Arrow function that uses an implicit return
const addNumbers = (num1,num2) => num1 + num2;

addNumbers(10,20); // 30

//Arrow function that uses a 'return' keyword in the block body
const addSomeNumbers = (num1,num2) => {
let total =  num1 + num2;
return total;
} 

Maccauhuru

//Arrow function that takes any number as input
//adds 100 and returns the total
const addHundred = num => num + 100;

addHundred(1);//output : 101
addHundred(1000); //output : 1100

Maccauhuru

//An ES6 Arrow function named addNumbers that accepts 2 input parameters 
const addNumbers = (num1,num2) => {
  let sum = num1 + num2;
  return sum;
}

//To invoke the function,i will call its name (addNumbers) and give it 2 parameters
addNumbers(5,2); // will output : 7
addNumbers(100,1); // will output : 101