sweep.scala

val input = "..*\n...\n*..";

val grid = input.split("\n").map(_.toArray)

def bomb(coord: Tuple2[Int,Int]) = { 
  for{
      row <- grid.lift(coord._1)
      cell <- row.lift(coord._2) 
      if(cell == '*')
    } yield 1
}

def nearby(x:Int, y:Int) = for( row <- x-1 to x+1; col <- y-1 to y+1) yield (row,col)

def score(x:Int, y:Int) : String = bomb2(x,y) match { 
  case Some(x) => " " 
  case None => nearby(x,y).flatMap(bomb2).sum.toString
}
var cells = grid.indices.map( x => grid(x).indices.map( y => score(x,y)))
cells.foreach(x => println(x.mkString))