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I said am fine with both and gave some examples why I answered like that.
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A category is a way of adding additional methods to a class without extending it. It is often used to add a collection of related methods. A common use case is to add additional methods to built in classes in the Cocoa frameworks. For example adding async download methods to the UIImage class. Less
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They were pretty easy and I handled them very nicely.
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Explained about the projects that i did in my previous company.