switch tupple

tupple.swift

typealias Result = (value: String?, error: String?)

let result = Result("value", nil)

switch result {
case let (.Some(value), .None):
  print(value)
case let (.None, .Some(error)):
  print(error)
case let (.Some(value), .None(error)):
  print(value, error)
case let (.None, .None):
  break
}

switch result {
case let (.Some(value), _):
  print(value)
case let (_, .Some(error)):
  print(error)
default:
  break
}