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In previous chapters of [[Objective-C 2.0 Essentials]] we have covered the concept of object-oriented programming in considerable detail. So far, however, we have focused almost exclusively on the how to create and work with our own classes and objects within Objective-C programs.

== Finding the Foundation Framework Documentation ==

A detailed overview of every class and method in the Foundation Framework is beyond the scope of this book and would be largely redundant given that this information is already provided by Apple in various locations. Instead, this book will focus on teaching you how to use the most common Foundation classes to work with numbers, strings, arrays and file systems. This knowledge, combined with the Apple Foundation documentation should be all you need to be begin working proficiently with these classes.

The Framework Reference Documentation lists all the classes available and for each class describes in detail what the class does and what methods are available. In the following chapters we will look in detail at how to work with some of these classes.

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