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Summary
Objective-C is a very small language, and we've covered almost all of it in this series, including some quite advanced features. As with Smalltalk, however, this is somewhat deceptive. While the core of the Objective-C language is very simple, a lot of the behavior of an Objective-C program comes from the library. This is usually an implementation of the OpenStep specification, such as GNUstep or Apple's Cocoa, and familiarity with the library can take a long time to achieve.
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