What is the significance of “?” In swift?


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More Apple iOS Swift Interview Questions

What is hashable in swift?

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What is a lazy var in swift?

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How can you prioritize the usability of the demand process?

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What is argument label in swift?

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How does swift achieve multiple inheritance?

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Explain functions?

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Is swift an object-oriented programming language?

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How to declare an empty dictionary in swift?

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What are the most important features of swift?

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Explain the difference between let and var in swift programming?

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