Life.scala

def play(gridStr: String): String = {
    val grid = convertStringToGrid(gridStr)

    val newG = grid.zipWithIndex.map {
      case (row, x) =>
        row.zipWithIndex.map {
          case (col, y) => {
            val count = countNeighbours(grid, x, y)
            if(count == 2 || count == 3)
              true
            else if (grid(x)(y) == false && count == 3)
              true
            else false
          }
        }
    }

    convertGridToString(newG)
  }

  def countNeighbours(grid : Vector[Vector[Boolean]], x: Int, y: Int): Int = {
    var count = 0
    val w = grid(0).size
    val h = grid.size

    if(x > 0 && grid(x - 1)(y) == true) {
      count = count + 1
    }
    if(x < (w - 1) && grid(x + 1)(y) == true) {
      count = count + 1
    }
    if(y < (h - 1) && grid(y + 1)(y) == true) {
      count = count + 1
    }
    if(y > 0 && grid(y - 1)(y) == true) {
      count = count + 1
    }
    count
  }