Book Image

Object-Oriented JavaScript - Second Edition

Book Image

Object-Oriented JavaScript - Second Edition

Overview of this book

JavaScript is the behavior, the third pillar in today's paradigm that looks at web pages as something that consists of clearly distinguishable parts: content (HTML), presentation (CSS) and behavior (JavaScript). Using JavaScript, you can create not only web pages but also desktop widgets, browser and application extensions, and other pieces of software. It's a pretty good deal: you learn one language and then code all kinds of different applications. While there's one chapter specifically dedicated to the web browser environment including DOM, Events and AJAX tutorials, the rest is applicable to the other environments Many web developers have tried coding or adopting some bits of JavaScript, but it is time to "man up" and learn the language properly because it is the language of the browser and is, virtually, everywhere. This book starts from zero, not assuming any prior JavaScript programming knowledge and takes you through all the in-depth and exciting futures hidden behind the facade. Once listed in the "nice to have" sections of job postings, these days the knowledge of JavaScript is a deciding factor when it comes to hiring web developers. After reading this book you'll be prepared to ace your JavaScript job interview and even impress with some bits that the interviewer maybe didn't know. You should read this book if you want to be able to take your JavaScript skills to a new level of sophistication.
Table of Contents (19 chapters)
Object-Oriented JavaScript Second Edition
About the Authors
About the Reviewer
Built-in Functions
Regular Expressions


Let's summarize the most important topics you have learned in this chapter:

  • All functions have a property called prototype. Initially it contains an "empty" object (an object without any own properties).

  • You can add properties and methods to the prototype object. You can even replace it completely with an object of your choice.

  • When you create an object using a function as a constructor (with new), the object gets a secret link pointing to the prototype of the constructor, and can access the prototype's properties.

  • An object's own properties take precedence over a prototype's properties with the same name.

  • Use the method hasOwnProperty() to differentiate between an object's own properties and prototype properties.

  • There is a prototype chain. When you execute, and if your object foo doesn't have a property called bar, the JavaScript interpreter looks for a bar property in the prototype. If none is found, it keeps searching in the prototype's prototype, then the prototype of the...