checkSEPnr.scala

def checkSEPnr(pnr:String)  = {

  val chars = pnr.toList
  val removeMinus = chars.view.filter(_ != '-')
  val charToInt = removeMinus.view.map(_ - '0')
  val lunsum: Int = charToInt.take(9).foldLeft( (0,2) ){
    (r,c) =>
    (r._1 + (c * r._2) / 10 + (c * r._2) % 10, if (r._2 == 2) 1 else 2)
    }._1 % 10

  val checkSum = if(lunsum == 0) 0 else 10 - lunsum

  checkSum == removeUndescore.last - '0'
}


checkSEPnr("711127-5868")