object Test {
  def main(args: Array[String]) = {
    val ary: Array[String] = Array("a", "b", "c")
    val lst: List[String] = List("a", "b", "c")
    val itr: Iterator[String] = lst.elements
    val str: Stream[String] = Stream.fromIterator(lst.elements)

    Console.println(ary.zipWithIndex.toList)
    Console.println(lst.zipWithIndex.toList)
    Console.println(itr.zipWithIndex.toList)
    Console.println(str.zipWithIndex.toList)
    assert(ary.zipWithIndex.isInstanceOf[Array[Pair[String,Int]]])

    val emptyArray = new Array[String](0)
    val emptyList: List[String] = Nil
    val emptyIterator = emptyList.elements
    val emptyStream = Stream.empty

    Console.println(emptyArray.zipWithIndex.toList)
    Console.println(emptyList.zipWithIndex.toList)
    Console.println(emptyIterator.zipWithIndex.toList)
    Console.println(emptyStream.zipWithIndex.toList)
  }
}