How to unwrap double optionals?

Question

How do you unwrap a string that is returned as:

(Optional(Optional \"blue\"))

var cityName = String()

if let cityAnno =         


        

Answer 1

_{This is more of an important comment.}

Think of a double optional as such:

indirect enum S {
  case value(s: S?)
  case none
}

While a normal optional is like this:

enum S {
  case value(s: S)
  case none
}

_{understanding why indirect is used in the first example is unimportant to scope of the question asked. It just doesn't compile without it! In the first example I was just trying to show that its internal type is also an optional type}