Objective-C
Cocoa is implemented with Objective-C. Chapter 4, “Objective-C,” describes Objective-C’s object-oriented additions to the standard C language. This chapter provides information intended to help developers select a language to use with Cocoa. Some of the features of Objective-C not shared by the other languages used with Cocoa are presented here to aid the comparison of languages. The details are not presented until Chapter 4.
Categories
Categories are an Objective-C feature that enables the specialization of classes without using inheritance. Categories can be used to add behaviors to existing classes without recompiling them. The instances of specialized classes gain the new behaviors. Even pre-existing instances and instances ...
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