TurkishCitizenshipNumberValidator.scala

// http://stackoverflow.com/questions/16617003/how-do-i-short-this-scala-code
trait TurkishCitizenshipNumberValidator {
  def turkishCitizenshipNumberValidator(t: String): Boolean = {
    if (t.length != 11 || !t.forall(_.isDigit)) false
    else {
      val n = t.map(_.asDigit)
      val evens = n.grouped(2).take(5).map(_(0)).sum
      val odds = n.grouped(2).take(4).map(_(1)).sum

      n(10) == (n.take(10).sum % 10) && n(9) == ((evens * 7 - odds) % 10)
    }
  } //> turkishCitizenshipNumberValidator: (t: String)Boolean
}

object test extends TurkishCitizenshipNumberValidator {
  // http://tckimliknouretici.appspot.com/
	turkishCitizenshipNumberValidator("29419391592")
                                                  //> res0: Boolean = true
}