How to add an optional string extension?

Question

You can create a String extension like so:

extension String {
   func someFunc -> Bool { ... }
}

but what if you want it to apply to opt

Answer 1

You can create an optional string extension. I did the following to set an optional string to empty if it was nil :

extension Optional where Wrapped == String {

    mutating func setToEmptyIfNil() {
        guard self != nil else {
            self = ""
            return
        }
    }

}