Better Code for a Better World

Some rantings about code and an introduction to using ReactiveCocoa to solve all of the problems currently facing mankind—a phrase I only use somewhat facetiously because if software really is taking over the world then better software can, in a very real way, lead to a better world, assuming you’re not writing software for a doomsday device, in which case you should go ahead and write terrible software—but mostly focusing on writing reactive user interfaces because that’s nice and demoable.

Transcript

1. (Welcome!)
2. Josh Abernathy @joshaber
5. for a ReactiveCocoa Better World
6. for a Better World Better Code
7. Some rantings about code and an introduction to using ReactiveCocoa to solve all of the problems currently facing mankind—a phrase I only use somewhat facetiously because if software really is taking over the world then better software can, in a very real way , lead to a better world, assuming you’re not writing software for a doomsday device, in which case you should go ahead and write terrible software—but mostly focusing on writing reactive user interfaces because that’s nice and demoable.
8. PERSPECTIVE
10. Bug-free (ish)
11. Bug-free (ish) Expressive
12. Bug-free (ish) Concise Expressive
13. PHILOSOPHY
14. “Out of the Tarpit”
15. Complexity is STATE
17. 2 states
18. 2 states 4 states
19. 2 states 4 states 8 states
20. 2 states 4 states 8 states 16 states
21. 32 states ... 64 states ... 128 states ... gazillion states ...
22. Minimize state
23. Minimize state by deriving it
26. 2 states
27. 2 states 4 states
28. 2 states 4 states 4 states
29. Complexity is CONTROL
30. Say what Not how
31. What and how
32. What
33. What and how
34. What
35. Complexity is the ENEMY
36. Is this complexity inherent to the problem?
37. i.e.,
38. Would a normal person think this is necessary?
39. ReactiveCocoa To The Rescue!
44. Declarative!
45. Minimal state! (we’ll see that more later)
46. PRAGMATISM
47. What is it?
48. It’s like a series of tubes...
49. A sequence of values over time.
50. A stream of things.
51. int a = 0; a = 1; ... a = 2;
52. 0 value of a: 1 2
53. (We already do this with variables, we just pretend we don’t.)
54. a RACSubscribable b c
55. a RACSubscribable
56. RACSubscribable
57. a b c RACSubscriber
58. ???
59. UI events
61. (20, 20)
62. (20, 20) (100, 0)
63. (20, 20) (100, 0) (120, 50)
65. h h
66. h hi h hi
67. h hi hi! h hi hi!
68. KVO
69. Async work
70. Network request
71. ???
72. KVO property = UI events = Network request = Async work = ??? = Subscribables
73. So what?
74. Shared Vocabulary
75. Shared Toolset
76. +combineLatest:reduce: -select: -where: -distinctUntilChanged -throttle: ...and infinity more...
77. Composable
78. To the Xcode!
80. Bug-free (ish)
81. Bug-free (ish) Expressive
82. Bug-free (ish) Concise Expressive
83. Minimize state by deriving it
84. Say what Not how
85. github.com/github/ReactiveCocoa More Info: Reactive Extensions (Rx) @joshaber elm-lang.org Functional Reactive Programming
86. (Thanks!)