Cocoa programming

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Cocoa is Apple's native object-oriented application programming interface (API) for the Mac OS X operating system and—along with the Cocoa Touch extension for gesture recognition and animation—for applications for the iOS operating system, used on Apple devices such as the iPhone, the iPod Touch, and the iPad.

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Cocoa (API) - Wikipedia, the free encyclopedia

Have you heard of the Cocoa programming language? It's a variation of C++. But what is it used for? How long has it been around?