lenafaure

var greeting = "Hi there!"; // global scope

function sayHello() {
  console.log(greeting);
}

sayHello(); // Prints "Hi there !"

lenafaure

var myVariable = "Hi, I am a global variable";

function sayHello() {
  myVariable = "Hi, I am locally produced!";
  console.log(myVariable);
}

console.log(myVariable); 	// Prints "Hi, I am a global variable"
sayHello();               // Prints "Hi, I am locally produced!"
console.log(myVariable);	// Prints "Hi, I am locally produced!"

lenafaure

var myJob = "Developer";

function showJob() {
  var myJob = "Designer";
  console.log(myJob);
}

showJob(); // Prints "Designer"

lenafaure

var myVariable = "global";
printVariable(); // Prints "local"

function printVariable() {
  var myVariable = "local";
  console.log(myVariable);
}

printVariable(); // Prints "local"

lenafaure

var customer = {
  firstName: "John",
  lastName: "Doe",
  greetCustomer: function(){
    // We use "this" instead of repeating "customer"
    console.log("Hello again " + this.firstName + " " + this.lastName + "!");
  }
}
customer.greetCustomer(); // Prints "Hello again John Doe!"

lenafaure

var customer = {
  firstName: "John",
  lastName: "Doe",
  greetCustomer: function(){
    console.log("Hello again " + this.firstName + " " + this.lastName + "!"); 
  },
  whatIsMyObject: function() {
    console.log(this);
  }
}

lenafaure

var customer = {
  firstName: "John",
  lastName: "Doe",
  greetCustomer: function(){
    console.log("Hello again " + this.firstName + " " + this.lastName + "!"); 
  },
  whatIsMyObject: function() {
    console.log(this);
  },
  address: {

lenafaure

var customer = {
  firstName: "John",
  lastName: "Doe",
  greetCustomer: function(){
    console.log("Hello again " + this.firstName + " " + this.lastName + "!");
  },
  calculateAge: function(currentYear, birthDate){
       console.log(this.firstName + " is " + (currentYear - birthDate) + " years old.");
  }
}

lenafaure

var customer2 = {
  firstName: "Jane",
  lastName: "Smith"
}
customer.calculateAge.call(customer2, 2016, 1984); // Prints "Jane is 32 years old"
customer.calculateAge.apply(customer2, [2016, 1984]); // Prints "Jane is 32 years old"

lenafaure

var customer = {
  firstName: "John",
  lastName: "Doe",
  greetCustomer: function(){
    console.log("Hello again " + this.firstName + " " + this.lastName + "!");
  },
  calculateAge: function(currentYear, birthDate){
       console.log(this.firstName + " is " + (currentYear - birthDate) + " years old.");
  }
}