CHAPTER 3

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Understanding the Ext JS 4 API

Ext JS 4 is one of the few JavaScript libraries whose API has been designed specifically for developers with experience in working with object-oriented (OO) languages. The library is organized into packages and classes, making it easy for any OO programmer to understand.

In this chapter, you’ll find out about the structure of Ext JS 4 API. And you’ll learn how to write OO code using Ext JS 4.

Structure of the API

The Ext JS 4 API documentation can be found at http://docs.sencha.com/extjs/4.2.0/#!/api.

The Ext JS 4 API is grouped into packages like those in Java. Every package contains a collection of classes, ...

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