Swift
Why optionals exist
Why does Swift have optionals?
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See the short answer
An optional puts 'this may have no value' into the type so the compiler can force you to handle nil.
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SwiftMultiple choiceIntro
Which of these three lines compile? Pick all that apply. …
#optional #nil
SwiftShort answerBasics
Extend Optional so that any optional can be asked for its nil status, like…
#optional #enum
SwiftShort answerAdvanced
Suppose there were no question-mark optional syntax and no standard Optional. If you had…
#optional #enum
SwiftMultiple choiceIntro
Which of these unwrap an optional safely? Pick all that apply.
#optional