Learn JavaScript's OOP (Object-Oriented Programming) features

Book Excerpt: Object-Oriented JavaScript

This chapter excerpt from Microsoft AJAX Library Essentials by Cristian Darie, Bogdan Brinzarea, is printed with permission from Packt Publishing, Copyright 2007.

In this chapter, you'll learn about OOP (Object-Oriented Programming) and how it relates to JavaScript. As an ASP.NET developer, you probably have some experience working with objects, and you may even be familiar with concepts such as inheritance. However, unless you're already an experienced JavaScript programmer, you probably aren't familiar with the way JavaScript objects and functions really work. This knowledge is necessary in order to understand how the Microsoft AJAX Library works, and this chapter will teach you the necessary foundations. More specifi cally, you will learn:

>What encapsulation, inheritance, and polymorphism mean
>How JavaScript functions work
>How to use anonymous functions and closures
>How to read a class diagram, and implement it using JavaScript
>How to work with JavaScript prototypes
>How the execution context and scope affect the output of JavaScript functions
>How to implement inheritance using closures and prototypes
>What JSON is, and what a JSON structure looks like

Related Links
>Object Oriented Programming Interview Questions

Explain an object, class and Method.

An object is an entity that keeps together state and behaviors. For instance, a car encapsulates state such as red color, 900 cc etc and behaviors as 'Start', 'Stop' etc., so does an object...............

Define Encapsulation and Information Hiding in OOP.

Encapsulation means keeping actions and attributes together under a single unit. This can also be understood using a motor bike example. A bike has actions such as 'switch on light', 'horn' etc. and attributes such specific color, size, weight etc..............