Issue about extending Optional with Generic Type in Swift

Question

I was trying to make an extension for safe unwrapping, and I was working in 2 version of it, one long code form, second short code! But unexpectedly they do not work! So far as I can see to my code, I just made all things correct! What I am missing to fix both version?

struct ContentView: View {
    
    let test: String? = "Hello, World!"
    
    var body: some View {
        Text(test.safeUnwrapV1(defaultValue: "Empty!"))
        Text(test.safeUnwrapV2(defaultValue: "Empty!"))
    }
    
}


extension Optional {    
    func safeUnwrapV1<T>(defaultValue: T) -> T {
        let wrappedValue: T? = (self as? T?) ?? nil
        if let unwrappedValue: T = wrappedValue { return unwrappedValue }
        else { return defaultValue }
    }
    
    func safeUnwrapV2<T>(defaultValue: T) -> T {
        return (self as? T) ?? defaultValue
    }
    
}

Answer 1

extension Optional {
    func safeUnwrap(_ defaultValue: Wrapped) -> Wrapped {
        switch self {
            case let value?: return value
            case nil: return defaultValue
        }
    }
}

Or even

extension Optional {
  func safeUnwrap(_ defaultValue: Wrapped) -> Wrapped {
    self ?? defaultValue
  }
}

But as was pointed out, this is more wordy and less idiomatic than just using the ?? operator.