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So far in [[Objective-C 2.0 Essentials]] we have looked at the basics of programming in Objective-C such as variable types, flow control and looping. Although it would be possible to write a functional program using these techniques, there is much more to becoming a proficient Objective-C programmer. Objective-C is, above all, an object oriented programming language and as such any Objective-C programmer will be expected to create object-oriented applications using this language.
Objective-C provides extensive support for developing object-oriented applications. The subject area of object oriented programming is, however, large. It is not an exaggeration to state that entire books have be dedicated to the subject. As such, a detailed overview of object oriented software development is beyond the scope of this book. Instead, we will introduce the basic concepts involved in object oriented programming and then move on to explaining the concept as it relates to Objective-C application development.