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Objective-C is a general-purpose, object-oriented programming language used by Apple for iOS and macOS app development. Created in the 1980s by Brad Cox and Tom Love, Objective-C combines Smalltalk-style messaging with C's syntax and flow control constructs. It was the primary language used by developers for creating iPhone apps before Swift took precedence in 2014. The language allows programmers to create dynamic applications with features such as run-time type checking, reflection, and categories — which enables adding methods to existing classes without subclassing them. Since its introduction, Objective-C has influenced several modern languages due to its early use of a runtime API that supports dynamic typing among other things.

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