Explain dictionary in swift.

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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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Is singleton thread safe swift?

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Is swift difficult to learn?

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What is a deinitializer in swift?

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Explain what Lazy stored properties is and when it is useful?

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What is benefit of using higher order functions?

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Explain some common execution states in ios?

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Is swift a functional language?

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What are delegates swift 4?

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List out what are the control transfer statements used in Swift?

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What is viewcontroller in swift?

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