What is forced unwrapping? Why is it potentially unsafe?
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What language is swift most similar to?
What is optional chaining?
What is init() in swift?
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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Should I use struct or class swift?
Explain what is Swift Programming Language?
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What is the use of double question mark “??” In swift?