Object Overview

Objects

• Objects are used to represent real world objects in programming

• Within an object, variables are known as properties and functions are known as methods

• Curly braces are a means of identifying if a variable is an object

// create an object that represents a dog

var myDog = {
  name: "Fido",
  age: 4,
  speak: function() {
    console.log('Woof woof');
  }
}

• In the example above, we created an object and stored it in a variable called myDog

• This object has 2 properties (name and age) and 1 method (speak)

Accessing Properties and Methods of Objects

• Properties and values can be assigned and read using Dot notation

var myDog = {
  name: "Fido",
  age: 4,
  speak: function() {
    console.log('Woof woof');
  }
}

// store myDog's name in a variable called dogName
var dogName = myDog.name;

// call the speak method of myDog 
myDog.speak();

JS Bin on jsbin.com

Updating Object properties using dot notation

• Object properties can be updated, added or deleted

JS Bin on jsbin.com