This document discusses asynchronous programming using futures. It explains that asynchronous code runs tasks at different times, while parallel code runs tasks at the same time. Futures allow separating work from result delivery by treating the result as an asynchronous value that can be accessed later. Common futures libraries include Bolts, PromiseKit, and BrightFutures. Futures can be chained and composed to build asynchronous workflows, and are useful for inverting control flow and exposing asynchronous APIs.

1. USING
FUTURES
@daloog

2. ABOUT
skype: nobidon
dalog@me.com
https://speakerdeck.com/dalog

3. ASYNC
VS
PARALLEL

4. ASYNC
DO THINGS AT
DEFERENT TIME

5. PARALLEL
DO THINGS AT
THE SAME TIME

6. GCD

7. GCD

8. NSOPERATION

9. NSOPERATION

10. [ _ TARGET:
ACTION: ]

11. DELEGATE

12. STRATEGY
AND
CALLBACK

13. BLOCK

14. CALLBACK!!!

15. SIGNATURE
DANCE

26. SEPARATE WORK
FROM
RESULT DELIVERY

27. SETTER

28. T -> ()

29. GETTER

30. () -> T

31. T -> U
IS
(GET, SET) -> ()

32. T -> U
(() -> T, U -> ()) -> ()

33. 🙀💀

34. ASYNC?

35. ASYNC GETTER

36. () -> T
(T -> ()) -> ()
SET -> ()

37. SET<T> -> ()
FUTURE<T>

38. ASYNC SETTER

39. T -> ()
() -> (T -> ())
() -> SET

40. () -> SET<T>
PROMISE<T>

41. GETTER
+
SETTER
=
STATE

42. PROMISE
+
FUTURE
=
ASYNC STATE

43. ASYNC STATE
>>>
STATE

44. WHY THIS IS SO
HARD???

45. ACTUALLY NOT

46. THINK ABOUT
FUTURE AS A BOX

47. BOX WILL BE
OPENED.
SOMEDAY.
MAYBE.

48. A = B
C = A

49. CHAIN?

50. T -> U
U -> K
T -> K

51. T -> F<U>
U -> F<K>
T -> F<K>

52. (F<U> , U -> F<K>)
->
F<K>

53. AND THEN

54. FLAT MAP

55. ERROR?

56. TRY<T, E>

57. FUTURE<T, E>
=
FUTURE<TRY<T, E>>

58. WHAT CAN BE
FUTURE?

59. ANYTHING

60. UI

61. USING FUTURES FOR REVERSING UI
FLOW.
HTTPS://MEDIUM.COM/P/D3F5B7CA32D9/
EDIT

62. VM ->
F<ACTION>

63. NETWORK
BLUETOOTH
…

64. EXPOSE F<>
AS PUBLIC API

65. ALWAYS

66. USE ANY LIB
• https://github.com/BoltsFramework/Bolts-iOS
• https://github.com/mxcl/PromiseKit
• https://github.com/Thomvis/BrightFutures
• https://realm.io/news/swift-summit-javier-soto-futures/
• https://realm.io/news/swift-tasks-nevyn-bengtsson/

67. ALL LIBS EQUAL
ITS JUST ASYNC STATE

68. FUTURE / PROMISE
ASYNC GET/SET