// Create Object var person = { name: 'Bob', age: 21, bio: function() { consoloe.log("Hi, I'm Bob"); }; };

function Person(name, age) { this.name = name this.age = age; this.bio: function() { consoloe.log("Hi, I'm Bob"); }; }; } // Create Object var bob = new Person('Bob', 20);

// Create Object var person = new Object(); person.name = 'Bob'; person['age'] = 21; person.greeting = function() { consoloe.log("Hi, I'm Bob"); };

// Create Object var person = new Object({ name: 'Bob', age: 21, greeting: function() { consoloe.log("Hi, I'm Bob"); } });

function Animal(name) { this.name = name; } Animal.prototype.sleep = function() { console.log(this.name + ': Zzz...'); } function Dog(name) { this.name = name; } // Create a reference for the prototype Dog.prototype = Object.create(new Animal());

function Person(name, age) { this.name = name; this.age = age; this.greet = function() { console.log("Hi, I'm Bob") } }; Person.prototype.introduce = function() { console.log("Hi, I'm Bob") }; // Create Object let bob = Person("Bob", 21) bob.greet() // "Hi, I'm Bob" bob.introduce() // "Hi, I'm Bob"

var Parent = function() { this.name = "Paremt"; } Parent.prototype.print = function() { console.log(this.name); } var parent = new Parent(); parent.print(); // "Parent"

var Child = function() { this.name = "Child"; this.initial = "Jr."; }

var inheritsFrom = function (child, parent) { child.prototype = Object.create(parent.prototype); }; inheritsFrom(Child, Parent);

var son = new Child(); son.print(); // "Child"

Child.prototype.print = function() { Parent.prototype.print.call(this); console.log(this.initial); } son.print() // "Jr."

var GrandChild = function() { this.name = "Grand Child"; this.initial = "JrJr."; } inheritsFrom(GrandChild, Child);

GrandChild.prototype.dance = function() { console.log("Let me dance for you, Bob") } GrandChild.prototype.print = function () { Child.prototype.print.call(this); console.log(this.initial); }

var grandChild = new GrandChild(); grandChild.print(); // "JrJr."

function Product(name, price) { this.name = name; this.price = price; } function Food(name, price) { Product.call(this, name, price); this.category = 'food'; } function Toy(name, price) { Product.call(this, name, price); this.category = 'toy'; } var cheese = new Food('feta', 5); var fun = new Toy('robot', 40);

function greet() { var reply = [this.person, 'is a', this.role].join(' '); console.log(reply); } var i = { person: 'Bob', role: 'Javascript Developer' }; greet.call(i); // Bob is a Javascript Developer

this.x = 9; // this refers to global "window" object here in the browser var module = { x: 81, getX: function() { return this.x; } }; module.getX(); // 81 var retrieveX = module.getX; retrieveX(); // returns 9 - The function gets invoked at the global scope var boundGetX = retrieveX.bind(module); boundGetX(); // 81

( new Foo ).__proto__ === Foo.prototype ( new Foo ).prototype === undefined

function Point(x, y) { this.x = x; this.y = y; } var myPoint = new Point(); // the following are all true myPoint.__proto__ == Point.prototype myPoint.__proto__.__proto__ == Object.prototype myPoint instanceof Point; myPoint instanceof Object;