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Test: Swift - Optional Chaining 3. let colorPref = account.secondName!.colorPref! - secondName and colorPref are optionals. How do you write this with Optional Chaining?
Results Congratulations! Correct Answer. You Answered: None. If you took the test, your answer will show up here. Correct Answer: let colorPref = account.secondName?.colorPref? Explanation For optional chaining, you would use the operator ? on the optionals in the chaining. Here we have two optionals secondName and colorPref and hence both of them get ? after them.Take the Test Take the complete test on this topic. You will be able to review answers to questions and get a test score.
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This article talks about optional chaining in swift where multiple optionals can be chained together and fail gracefully by returning nil when one of them is nil.
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Test on optional chaining to safely return a nil or non-nil value from a series of optionals chained together.
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