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What is optional chaining?


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More Apple iOS Swift Interview Questions

Explain how multiple line comment can be written in swift?

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How to call objective-c code from swift?

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What does appdelegate swift do?

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Consider the following code: var defaults = NSUserDefaults.standardUserDefaults() var userPref = defaults.stringForKey("userPref")! printString(userPref) func printString(string: String) { println(string) } Where is the bug? What does this bug cause? What’s the proper way to fix it?

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What is the full meaning of swift?

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What is a type in swift?

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Why do we use swift?

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What are regular expression and responder chain in swift?

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Is swift difficult to learn?

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What is weak in swift?

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What is singleton in swift?

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What are functions in swift?

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