ios - complementery of an if case

Question

How would you write this:

if case .SomeEnum(3) = enumType where myInt == 3 {
   //I don't need this case
} else {
   //This is the case I need
}

I know I could use guard:

guard case .SomeEnum(3) = enumType where myInt == 3 else {
    //This is the case I need
}

but I don't think it is clean, since it is not really a case in which the function is not able to finish. Also, guard expects me to return from the function.

Any other alternatives?

Answer 1

You cannot negate a pattern (as far as I know), and your first solution using if/else looks fine to me, the intention of the code is clearly visible.

A switch statement would be an alternative:

switch enumType {
case .SomeEnum(3) where myInt == 3:
    break  // I don't need this case
default:
    // This is the case I need
    // ...
}

With regard to your remark

Also, guard expects me to return from the function.

that is not entirely true. You are expected to leave the current scope. So this would compile and work as expected:

repeat {
    guard case .SomeEnum(3) = enumType where myInt == 3 else {
        // This is the case I need
        // ...
        break
    }
} while false

but I would not consider that a better solution.