Lcd.scala

package dojo

/**
 * Created with IntelliJ IDEA.
 * User: Jim Collins
 * Date: 17/09/2015
 */
trait Lcd  {
  val contents: List[String]
  override def toString = contents mkString "\n"
}

object Lcd {
  def op(a: Lcd, b: Lcd): Lcd = new Lcd {
    override val contents: List[String] =
      (a.contents zip b.contents).map((f: (String,String)) => f._1 + f._2)
  }

  def zero: Lcd = new Lcd {
    override val contents = List("", "", "")
  }

  def concatenate(as: List[Lcd]): Lcd = as.foldLeft(zero)(op)

  val Zero = new Lcd { override val contents: List[String] = List("._.", "|.|", "|_|")}
  val One = new Lcd {override val contents: List[String] = List("...", "..|", "..|")}
  val Two = new Lcd {override val contents: List[String] = List("._.", "._|", "|_.")}
  val Three = new Lcd {override val contents: List[String] = List("._.", "._|", "._|")}
  val Four = new Lcd {override val contents: List[String] = List("...", "|_|", "..|")}
  val Five = new Lcd {override val contents: List[String] = List("._.", "|_.", "._|")}
  val Six = new Lcd {override val contents: List[String] = List("._.", "|_.", "|_|")}
  val Severn = new Lcd {override val contents: List[String] = List("._.", "..|", "..|")}
  val Eight = new Lcd {override val contents: List[String] = List("._.", "|_|", "|_|")}
  val Nine = new Lcd {override val contents: List[String] = List("._.", "|_|", "..|")}
  val mappings = Map(0 -> Zero, 1 -> One, 2 -> Two, 3 -> Three, 4 -> Four, 5 -> Five, 6 -> Six, 7 -> Severn, 8 -> Eight, 9 -> Nine)
}

object Main{
  def main (args: Array[String]) {
    import Lcd._
    println(concatenate(1234567890.toString.map(_.asDigit).map(mappings(_)).toList))
  }
}