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 are generics? How to make a method or variable generics in swift?

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What is differences in swift 1.x, 2.x, 3.x, 4.x?

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How long does a swift transfer take?

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Is equal to string swift?

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Can enum conform to swift protocol?

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Explain swift vs objective-c.

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What is difference between xcode and swift?

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Explain the difference between let and var in swift programming?

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How can you define a base class in swift?

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What is lazy in swift?

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What is atomic swift?

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