What is the preferred approach to check and unwrap an optional Error

Using Swift
6

This shouldn't be preferred at all in this situation. Furthermore you ignore that error is still optional and the compiler will emit a warning when you pass an optional value to print. (Or have you missed the force unwrap? But I still discourage you from writing code like this even though it's true that you're safe to force unwrap there.)

I think the cleanest solution here is to unwrap it and return from the main function or proceed otherwise.

func f2(error: Error?) {
  if let error = error {
    return print("Error: \(error)")
  }
  print("start processing")
}

So f2 is the way to go here. I also would consider f3 as good enough but that depends on the nested scopes that will follow in the real wold use case (avoid pyramid of doom).

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