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Pro Ext JS 4 is both an example-driven programmer's guide and an invaluablereference.It covers in-depth features, concepts, and component of the Ext JS 4 framework - including the latest 4.1 additions - with real world, re-usable examples and explanation. Ext JS 4 is a powerful and popular JavaScript Rich Internet Application (RIA) framework that helps you build interactive web applications with great performance and maximum efficiency. Harness the power of Ext JS's new MVCarchitecture to create a new breed of web applications, utilizing the automated optimization tools to squeeze out every last drop of performance. Learn how Ext JS's superb component model enables you to work seamlessly in teams to create JavaScript code that runs flawlessly across all major web browsers.Pro Ext JS 4 covers all you need to become a professional Ext JS developer, from getting the most from JSBuilder, to unit testing your code, to extending the Ext JS core with custom components. A deep dive intoExt JS 4 application architecture and its major building blocks that enable building applications with minimum effort for maximum performance. Practical use of Ext JS 4 with real world examples, explanation, and screenshots. Teaches you how toextend, debug, unit test and Optimize yourExt JS 4 web applications. What youll learn Understand the capabilities of Ext JS 4 as a JavaScript Rich Internet Applications (RIA) framework. A deeper look at Ext JS 4 building blocks. Develop with Ext JS 4 for reusability. Use theExt JS 4 rich, modern UI widgets. Get the most from the Ext JS 4 MVC application architecture. Extend, debug, test, and optimize Ext JS 4 applications. Migrate from Ext JS 3 to 4. Who this book is for Pro Ext JS 4 is for web application developers who want to use their creative ideas to quickly develop interactive Rich Internet Applications. You should have some experience of JavaScript and its frameworks.