scala> val list = List(1, 2, 3, 4, 5, 6, 7, 8, 9)
list: List[Int] = List(1, 2, 3, 4, 5, 6, 7, 8, 9)

scala> val iter = list.elements
iter: Iterator[Int] = non-empty iterator

scala> val firstTwoElements = iter.filter(_ < 5).zipWithIndex.takeWhile(_._2 < 2).map(_._1).toList
firstTwoElements: List[Int] = List(1, 2)

scala> assert(iter.toList == List(3, 4, 5, 6, 7, 8, 9))
java.lang.AssertionError: assertion failed
	at scala.Predef$.assert(Predef.scala:87)
	at .<init>(<console>:7)
	at .<clinit>(<console>)
	at RequestResult$.<init>(<console>:3)
	at RequestResult$.<clinit>(<console>)
	at RequestResult$result(<console>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.j...
scala>