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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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Test is Based on this Article
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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