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 someOptional.i…

#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