Translate Ints to and From Bit Positions

BitInsanity.scala

object BitInsanity {

  def bitPositions(int: Int): List[Int] = {
    val buffer = new scala.collection.mutable.ListBuffer[Int]()
    var number = int
    var position = 0
    while (number != 0){
      if ((number & 1) != 0) {
        buffer.addOne(position)
      }
      position += 1
      number = number >>> 1
    }
    buffer.toList
  }

  def fromBitPositions(l: List[Int]): Int = {
    var x = 0x00
    l.foreach{bitPosition => 
      val mask = 1 << bitPosition
      x = x | mask
    }
    x
  }
}