kristyburge

// Constructor Function
var Friend = function(name, password, interests, job){
  this.fullName = name;
  this.password = password;
  this.interests = interests;
  this.job = job;
};

function sayHello(){
   // uncomment the console.log to see the object that 'this' points to

kristyburge

// Using the Dog prototype, create a new instance 
var chester = new Dog('beagle', 'Chester', ['Gracie', 'Josey', 'Barkley']);
chester.intro();        // returns Hi, my name is Chester and I'm a beagle
console.log(chester);   // returns Dog {breed: "beagle", name: "Chester", friends: Array(3), intro: ƒ}

// Here's another example:
var City = function(city, state) {
  this.city = city || "Phoenix";
  this.state = state || "AZ";
  this.sentence = function() {

kristyburge

var str = new String('Hello world');
/*******
You could do the above, but it's best to avoid it (instead do like the variable str2 below)
(because JavaScript knows that anything inside single or double quotes has the type of String)

Same goes for other primitives. This is for example purposes only. 

NOTE: To clarify -- the only time I ever use the new keyword in practice is when I use a function constructor and create my own object type.
*******/

kristyburge

function test() {
  'use strict';
  return this;
}

console.log( test() );
// returns undefined, not the Window object … interesting

kristyburge

function test() {
  console.log('hello world');
  console.log(this);
}

test();

// hello world
// Window {postMessage: ƒ, blur: ƒ, focus: ƒ, close: ƒ, frames: Window, …}

kristyburge

var dog = {
  name: 'Chester',
  breed: 'beagle',
  intro: function(){
    console.log(this);
  }
};

dog.intro();

kristyburge

var dog = {
  breed: 'Beagles',
  lovesToChase: 'rabbits'
};

function chase() {
  console.log(this.breed + ' loves chasing ' + this.lovesToChase + '.'); 
//   console.log(this);
}

kristyburge

function Dog(breed, name, friends){
    this.breed = breed;
    this.name = name;
    this.friends = friends;	
    this.intro = function() {
        console.log(`Hi, my name is ${this.name} and I’m a ${this.breed}`);
        return this;
    }; 
}

kristyburge

var objReg = {
  hello: function() {
    return this;
  }
};
 
var objArrow = {
  	hello: () => this
};
 

kristyburge

console.log(this);

// returns the Window object
// Window {	postMessage: ƒ, 
// blur: ƒ, 
// focus: ƒ, 
// close: ƒ, 
// frames: Window, …}

function myFunction() {