DelegatingIterable class

1. Constructors
2. DelegatingIterable
3. Properties
4. delegate
5. first
6. isEmpty
7. isNotEmpty
8. iterator
9. last
10. length
11. single
12. hashCode
13. runtimeType
14. Methods
15. any
16. cast
17. contains
18. elementAt
19. every
20. expand
21. firstWhere
22. fold
23. followedBy
24. forEach
25. join
26. lastWhere
27. map
28. reduce
29. retype
30. singleWhere
31. skip
32. skipWhile
33. take
34. takeWhile
35. toList
36. toSet
37. where
38. whereType
39. noSuchMethod
40. toString
41. Operators
42. operator ==