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What is an extension?
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Answer / Krati Vishnoi
In Objective-C, an extension is a way of adding methods and properties to existing classes without modifying the original implementation files. Extensions help you separate your code into smaller parts, making it more readable and manageable. To create an extension, simply place the additional code inside a curly brace block following the @interface declaration for the class in a .m or .h file.
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