object Demo
{
  def disp[A](a : List[A])
  {
    for(e <- a)
      printf(s"$e ")
    println
  }

  def doubleNum(a : Int) : Int = 2*a

  def main(args : Array[String])
  {
    var a = List();

    // fill
    var b = List.fill(10)(1);
    disp(b)

    // range
    var c = List.range(1, 10); // 1, 2, 3, 4, 5, 6, 7, 8, 9
    disp(c)

    // tabulate
    var d = List.tabulate(10)(n => n*n)
    disp(d)

    // reverse
    disp(d.reverse)
  }
}
		

object Demo
{
  def disp[A](a : List[A])
  {
    for(e <- a)
      printf(s"$e ")
    println
  }

  def doubleNum(a : Int) : Int = 2*a

  def main(args : Array[String])
  {
    val a = Nil // empty list
    val b : List[Int] = List(1, 2, 3, 4)
    var c : List[Int] = List(5, 6, 7, 8)

    println("Head: "+b.head) // head
    println("Tail: "+b.tail) // tail
    disp(10 :: b) // attach a nubmer before head
    disp(b :+ 10) // append a number after tail

    disp(b ::: c) // concate two lists

    println(b(0)) // access list with index

    println(b.size) // size
    println(b.max) // max
    println(b.min) // min
    println(b.sum) // sum

    println(b.mkString("|")) // mkString

    disp(b.sortWith(_.compareTo(_) < 0))

    disp(b.map(doubleNum)) // map
    println(b.reduce(_+_)) // reduce
  }
}