The web browser is the most common environment, but it is not the only one. JavaScript programs run inside a host environment. JavaScript provides behavior, the third pillar in today's paradigm that sees web pages as consisting of three clearly distinguishable parts: content (HTML), presentation (CSS), and behavior (JavaScript). Developers leverage the object-oriented nature of the language to build scalable code architectures made up of reusable pieces. JavaScript started with simple one-liners embedded in HTML, but is now used in much more sophisticated ways. What do Yahoo! Maps, Google Maps, Yahoo! Mail, My Yahoo!, Gmail, Digg, YouTube and a plethora of other popular "Web 2.0" applications have in common? They all offer rich and responsive user interfaces, heavily employing code written in the JavaScript language. You should read this book if you want to be able to take your JavaScript skills to a new level of sophistication. 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. Along the way, we cover many of the recent innovations such as AJAX, JSON, and interesting design and coding patterns. This book treats JavaScript as a serious object-oriented language, showing you how to build robust, maintainable, and powerful libraries and applications. While this book has one chapter specifically dedicated to the web browser environment including DOM, events, and AJAX tutorials, the rest is applicable to all the other environments too. It's a pretty good deal: you learn one language and then code all kinds of different applications.
JavaScript is the language of the browser, but it's also heavily employed in many other environments: server-side programming, desktop applications, application extensions and widgets. Where in the past we used to have the occasional few lines of JavaScript embedded in a web page, now we have advanced libraries and extensible architectures, powering the "fat-client", AJAX-type rich internet applications. 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.
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