The Cocoa frameworks consist of libraries, APIs, and runtimes that form the development layer for all of OS X
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Why people like Cocoa (OS X)
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Much of Cocoa is implemented in Objective-C, an object-oriented language that is compiled to run at incredible speed, yet employs a truly dynamic runtime making it uniquely flexible. Because Objective-C is a superset of C, it is easy to mix C and even C++ into your Cocoa applications.


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