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Test: Swift - Optional Binding

2. Which of the following can be used for Optional Binding for an Optional String named address?



Results
Congratulations! Correct Answer.
You Answered: None. If you took the test, your answer will show up here.
Correct Answer: if let address = address {} else {}; if let tempAddress = address {} else {}; if var address = address {} else {};
Explanation
The most preferred way is A — where both the constant non-optional and variable optional are named the same. B and C work as well. With D, if clause is checking whether address is true or false. But address is a string. So, this will be an error.
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Question 2 of 5


Test is Based on this Article
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This article discusses the safer ways of unwrapping an optional in Swift that includes Optional Binding.
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Test on using Optional Binding in Swift.

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