What should we use for unwrapping value inside optional?

A common way of unwrapping optionals is with if let syntax, which unwraps with a condition. If there was a value inside the optional then you can use it, but if there wasn’t the condition fails. For example: if let unwrapped = name { print(“\(unwrapped.

What is optional in Swift and nil in Swift?

Because optionals may or may not be empty, Swift won’t let you us them freely. If an optional is empty – nil , in Swift – then it can’t be used in your code. For example: If you have an optional string, you don’t want to try and show it to your users – the string might be empty.

What does unwrapping mean in Swift?

Unwrapping an optional means that you are now casting that type as non-optional. This will generate a new type and assign the value that resided within that optional to the new non-optional type. This way you can perform operations on that variable as it has been guaranteed by the compiler to have a solid value.

What is optional unwrapping in Swift?

1. Forced Unwrapping optionals in Swift. Force Unwrapping an optional either returns the value if it exists or triggers a runtime error when the optional is nil .

What is force unwrapping in Swift?

It’s the action of extracting the value contained inside an Optional . This operation is dangerous because you are telling the compiler: I am sure this Optional value does contain a real value, extract it!

What is nil in Swift?

In Swift, nil isn’t a pointer—it’s the absence of a value of a certain type. Optionals of any type can be set to nil , not just object types.

Why do we use optional in Swift?

Optionals are in the core of Swift and exist since the first version of Swift. An optional value allows us to write clean code with at the same time taking care of possible nil values. If you’re new to Swift you might need to get used to the syntax of adding a question mark to properties.

What is wrapping and unwrapping in Swift?

Wrapping means the actual value is stored in a logical outer structure. You cannot get to that value (in this case “moo”) without unwrapping it. In Swift world, it is always Christmas, and there are always presents — or at least variables — to unwrap. You unwrap values by adding exclamation points.