TheWorstAnyUpper.swift

import Foundation

extension String.UnicodeScalarView.Generator {
  mutating func hasUpper() -> Bool {
    return next().map {
      NSCharacterSet
        .uppercaseLetterCharacterSet()
        .longCharacterIsMember(UInt32($0))
      || hasUpper()
    } ?? false
  }
}

extension String {
  func hasUpper() -> Bool {
    var g = unicodeScalars.generate()
    return g.hasUpper()
  }
}