odwrotnie

case class Currency(name: String, short: String, p: String, left: Boolean = false) {

  def digits(value: Double) = append("%.2f" format value, short)
  def words(value: Double) = {
    val before = w(value.toLong)
    val after = w(((value * 100.0f) % 100).toLong)
    List(before, after).filterNot(_.isEmpty).zip(List(short, p)).
      map(t => List(t._1, t._2)).flatten.mkString(" ").trim
  }