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Convert from Objective_C

Objective-C is an object-oriented programming language that adds Smalltalk-style messaging to the C programming language. It was the main programming language supported by Apple for macOS, iOS, and their respective application programming interfaces (APIs), Cocoa and Cocoa Touch, until the introduction of Swift. The language was used for building apps for iOS and macOS, as well as being the primary language for NeXTSTEP, from which macOS and iOS derive.