Optional vs Implicitly Optional Unwrap in Swift

What is the difference?

For all the beginners but also the iOS developers who have lots of experience in their shoulders, must have seen sometimes while programming XCode suggest you put !! or ?? after a variable or object declaration. In this blog we are going to clean out once and for all the difference between Optional and Implicitly in Swift.

Example:

When you use String you’re saying this will always have a string inside, and can never have nothing inside. It might be an empty string (""), but even an empty string is still a string.

When you use String? you’re saying this might have a string inside, but it might have nothing at all inside – not even an empty string. Swift won’t let you use these without unwrapping them, which is usually done using if let.

When you use String! you’re saying this might have a string inside, but it might have nothing at all inside – not even an empty string. However, Swift lets you use these as if they were a String, as if they always do have a value, but if you try to use a nil value by accident your code will crash. This effectively lets you say “I know this might be nil, but I’m so sure it has a value that I’m willing for my program to crash if I’m wrong.”

So: String is definitely a string, String? might be nil or might be a string, and String! might be nil but when you use it you’re absolutely sure it has a string.

Hope this article has cleared some confusion in Swift.

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