Life game in Scala ver Iterator

gistfile1.scala

import _root_.scala.util.Random

def lifeGameIterator(stride:Int) = new Iterator[Array[Array[Boolean]]] {
  private def pathFilter(num : Int) = num
  private def prevFilter(num : Int) = if(num == 0) stride - 1 else num - 1
  private def nextFilter(num : Int) = if(num == stride - 1) 0 else num + 1
  private def cellArriveGetter(xFilter:(Int)=>Int, yFilter: (Int)=>Int)
    (cells:Array[Array[Boolean]], x:Int, y:Int) = cells(yFilter(y))(xFilter(x))
  
  private val _isArriveGetter = List(
      cellArriveGetter(prevFilter, prevFilter)_ , cellArriveGetter(pathFilter, prevFilter)_ , cellArriveGetter(nextFilter, prevFilter)_ ,
      cellArriveGetter(prevFilter, pathFilter)_ , cellArriveGetter(nextFilter, pathFilter)_ ,
      cellArriveGetter(prevFilter, nextFilter)_,cellArriveGetter(pathFilter, nextFilter)_,cellArriveGetter(nextFilter, nextFilter)_)

  private var _cells = Array.tabulate(stride, stride)((_,_) => Random.nextInt % 5 == 0)

  def hasNext = true

  def next:Array[Array[Boolean]] = {
    _cells.zipWithIndex.map(row => row._1.zipWithIndex.map(cell => {
        val count = _isArriveGetter.foldLeft(0)((acc, f) => acc + (if(f(_cells, cell._2, row._2)) 1 else 0))
        count == 3 || count == 2 && cell._1
    }))
  }

}

lifeGameIterator(30).foreach(cells => {
  cells.foreach(row => {
      row.foreach(cell => {print(if(cell) "●" else "○")})
      println
    })
  println
  Thread.sleep(500)
})