Ext JS 4 is a major step forward for web frameworks. Building on Ext JS 3.3, our latest release adds over 350 new APIs, 50 new classes, and 65% more documentation. Ext JS 4 also brings an entirely new data package that enables developers to use a model-view-controller architecture when building their app. The new MVC enables apps to leverage features like Infinite Scrolling a Grid to build an entirely new level of interactivity in to web apps.
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