what is objective C? Explained with history of objective-C and its important features
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OBJECTIVE C VS SWIFT COMPARISON
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"Uncle" Bob Martin - A brief history of Obj-C
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Beginning Objective-C Classes and Methods - raywenderlich.com
Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. It was the main programming language used by Apple for the OS X and iOS operating systems, and their respective application programming interfaces (APIs) Cocoa and Cocoa Touch prior to the introduction of Swift.