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1. scala> List(1,2,3,4).iterator.map((x: Int) => println(x))
2.
3. 1
4. 2
5. 3
6. 4
7.
8. List(1,2,3,4).map((x: Int) => println(x))
9. List(1,2,3,4).foreach((x: Int) => println(x))
10. List(1,2,3,4).iterator.foreach((x: Int) => println(x))
11.
12. def lazyMap[T, U](coll: Iterable[T], f: T => U) = new Iterable[U] {
13.   def iterator = coll.iterator map f
14. }
15.
16. scala> lazyMap(List(1,2,3,4), (x: Int) => x + 1)
17. res4: java.lang.Object with Iterable[Int] = (2, 3, 4, 5)
18.
19. scala> List(1,2,3,4).iterator.map((x: Int) => println(x))
20. res0: Iterator[Unit] = non-empty iterator
21.
22. // nothing actually happened yet, just remember to do this printing things
23.
24. scala> res0.toList
25. 1
26. 2
27. 3
28. 4
29. res1: List[Unit] = List((), (), (), ())
30.
31. scala> { lazyMap(List(1,2,3,4), {(x: Int) => println(x); x + 1}); 1 }
32.
33. scala> val itr = List(1,2,3).iterator
34. itr: Iterator[Int] = non-empty iterator
35.
36. scala> val mappedItr = itr.map((x: Int) => println(x))
37. mappedItr: Iterator[Unit] = non-empty iterator
38.
39. scala> mappedItr.next
40. 1
41.
42. scala> mappedItr.next
43. 2
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