What is the difference between underscore and self (i.e self.xx and _xx) ?

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What do you mean by cocoa?

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Who calls dealloc method? Can we implement dealloc in arc? If yes, what is the need to do that?

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What is difference between objective c and swift?

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Explain types of protocol?

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Distinguish between @synthesize and @dynamic in objective –c?

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What are blocks and how are they used?

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What are the advantages of using objective-c?

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Is objective c object oriented?

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What is synthesize objective c?

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Are id and instancetype same? If not, what are differences between them?

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What is concept of property?

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What is the difference between category and extension in objective c?

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What is the difference between nsdictionary and nsmutabledictionary?

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What is nonatomic in objective c?

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