Robot Wharehouse

output.txt

..........
..........
..........
..........
..........
..........
..........
..X.......
..........
..........

..........
..........
..........
..........
..........
..........
..........
..........
..........
X.........

.........X
..........
..........
..........
..........
..........
..........
..........
..........
..........

..........
..........
..........
..........
..........
..........
..........
..........
..........
X.........

Robots.scala

import scala.util.Try

object Robots extends App{

  object Direction extends Enumeration{
    type Direction=Value
    val N,E,S,W=Value
  }

  final val MAX_X=10
  final val MAX_Y=10

  case class Robot(x:Int, y: Int){
    def moveRobot(direction: Direction.Value): Robot={
      direction match {
        case Direction.N if x<MAX_X-1 => copy(x=x+1)
        case Direction.E if y<MAX_Y-1 => copy(y=y+1)
        case Direction.S if x>0 => copy(x=x-1)
        case Direction.W if y>0 => copy(y=y-1)
        case _=>this
      }
    }
  }

  def renderGrid(robot: Robot): String={
    List.tabulate(MAX_X, MAX_Y){ (x,y)=>
      if (robot.x==x && robot.y==y) 'X' else '.'
    }.map(_.mkString("")).reverse.mkString("\n")+
      "\n"
  }

  def moveRobot(route: Seq[Direction.Value], robot: Robot): Robot={
    route.foldLeft(robot){ _.moveRobot(_) }
  }

  def moveRobot(route: String, robot: Robot): Robot={
    moveRobot(parseRoute(route), robot)
  }

  def parseRoute(route: String): Seq[Direction.Value] ={
    route.split(' ').flatMap(name=>Try{Direction.withName(name)}.toOption).toList
  }

  val endRobot1=moveRobot("N N N E E S XXX", Robot(0,0))

  println(renderGrid(endRobot1))

  val endRobot2=moveRobot("S S S W W W W", endRobot1)

  println(renderGrid(endRobot2))

  val topRight=moveRobot("N E "*20, endRobot2)

  println(renderGrid(topRight))

  val bottomLeft=moveRobot("S W "*20, topRight)

  println(renderGrid(bottomLeft))

}