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Test: Swift - Nil Coalescing Operator

2. color = userColor ?? “Blue” - what is this equivalent to, if userColor is an optional?



Results
Congratulations! Correct Answer.
You Answered: None. If you took the test, your answer will show up here.
Correct Answer: if userColor != nil {color = userColor!} else {color = “Blue”}; color = userColor != nil ? userColor! : “Blue”;
Explanation
Here, the logic would be if the userColor is not nil, then give that; if not give the default provided. Choice B above uses the if-else block and choice C uses the ?: operator correctly. In both cases userColor is unwrapped as that is optional.
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Question 2 of 5


Test is Based on this Article
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This article talks about the Nil Coalescing Operator (??) in Swift.
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Test on Nil Coalescing Operator for Optionals.

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