What are the various ways to unwrap an optional 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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How proficient are you in objective-c and swift? Can you briefly describe their differences?

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Is swift compiled or interpreted?

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What is difference between 'let' and 'var' declaration ?

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How can you define a base class in swift?

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What is argument label in swift?

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Consider the following code: let op1: Int = 1 let op2: UInt = 2 let op3: Double = 3.34 var result = op1 + op2 + op3 Where is the error and why? How can it be fixed?

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Can enum conform to swift protocol?

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What is de-initializer and how it is written in Swift?

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How long does a swift transfer take?

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Mention what are the features of Swift Programming?

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