What is the meaning of question mark "?" In swift?


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More Apple iOS Swift Interview Questions

What is the full form of swift code?

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What is unowned in swift?

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What is swift? How is it different from objective-c?

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How can you make a property optional in swift?

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Is swift a functional language?

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What collection types are available in swift?

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Is swift dynamic or static?

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What are methods in swift?

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How is swift different from objective-c?

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What is forced unwrapping? Why is it potentially unsafe?

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Mention what is the difference between Swift and ‘Objective-C’ language?

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What are the various ways to unwrap an optional in swift?

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