DelegatingSet class

1. Constructors
2. DelegatingSet
3. Properties
4. delegate
5. first
6. hashCode
7. isEmpty
8. isNotEmpty
9. iterator
10. last
11. length
12. runtimeType
13. single
14. Methods
15. add
16. addAll
17. cast
18. clear
19. containsAll
20. difference
21. intersection
22. lookup
23. remove
24. removeAll
25. removeWhere
26. retainAll
27. retainWhere
28. retype
29. union
30. any
31. contains
32. elementAt
33. every
34. expand
35. firstWhere
36. fold
37. followedBy
38. forEach
39. join
40. lastWhere
41. map
42. noSuchMethod
43. reduce
44. singleWhere
45. skip
46. skipWhile
47. take
48. takeWhile
49. toList
50. toSet
51. toString
52. where
53. whereType
54. Operators
55. operator ==