1. 属性
2. 第一个
3. hashCode
4. isBroadcast
5. isEmpty
6. 最后一个
7. length
8. runtimeType
9. 单个
10. 方法
11. 任意
12. asBroadcastStream
13. asyncExpand
14. asyncMap
15. cast
16. contains
17. distinct
18. drain
19. elementAt
20. every
21. expand
22. firstWhere
23. fold
24. forEach
25. handleError
26. join
27. lastWhere
28. listen
29. map
30. noSuchMethod
31. pipe
32. reduce
33. singleWhere
34. skip
35. skipWhile
36. take
37. takeWhile
38. timeout
39. toList
40. toSet
41. toString
42. transform
43. where
44. 运算符
45. 运算符 ==