Reactive Programming Workshop

Slides for Reactive Programming workshop. Reactive Swift. Signals, Signal Producers etc

1. Reactive Programming Workshop by Paul Taykalo, Stanfy 1 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
2. Plan 2 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
3. Plan → About Reactive Programming → Basics → Reactive Libraries Differences → Debugging Tooltips → Modifying Code to Reactive → Switching Back from Reactive? 3 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
4. About Reactive Programming 4 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
5. Async vs Sync 5 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
6. Everything is a Stream 6 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
7. Stream of values over time 7 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
8. Stream → Push driven → Can send multiple values → Can be cancelled → Can complete → Can fail with error → Can be termintated (Ugh) * 8 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
9. Observable Signal SignalProduc 9 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
10. Signal<Value, Error> 10 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
11. Signal<Value, Error> 11 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
12. Signal<Value,Error> 12 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
13. Signal<Event> 13 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
14. Signal Events enum Event<Value, Error> { case value(Value) case failed(Error) case completed case interrupted } 14 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
15. Signal Termination enum Event<Value, Error> { case value(Value) case failed(Error) // ❌ case completed // ❌ case interrupted // ❌ } 15 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
16. Signal SignalProducer 16 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
17. Signal SignalProducer 17 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
18. Signal Producer vs Signal let tvSignal: Signal<EMChange,NoError> struct TV { let signal: Signal<EMChange,NoError> let channels: [SignalProducer<Frame, Error>] } 18 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
19. Transformations 19 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
20. map Signal<V,E> -> Signal<V',E> 20 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
21. map let ints: Signal<Int, NoError> let strings = ints.map { int in "\(int)"} // string: Signal<String, NoError> 21 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
22. mapError Signal<V,E> -> Signal<V,E'> 22 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
23. mapError let ints: Signal<Int, NoError> let failableInts = ints.mapError { err in CustomError.failed } // string: Signal<Int, CustomError> 23 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
24. flatMap Signal<V,E> -> Signal<V',E'> 24 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
25. flatMap let strings: Signal<String, NoError> let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal<Int, CustomError> 25 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
26. flatMap let strings: Signal<String, NoError> let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal<Int, CustomError> 26 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
27. flatMap let strings: Signal<String, NoError> let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal<Int, CustomError> 27 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
28. flatMap let strings: Signal<String, NoError> let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal<Int, CustomError> 28 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
29. flatMap let getUserID: SignalProducer<User, NetworkError> let userIDs: SignalProducer<String, NoError> let users = userIDs .producer .flatMap(.latest) { userID in getUserID(userID) } // users: SignalProducer<User, NetworkError> 29 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
30. flatMap let userIDs: Signal<String, NoError> let getUserID: SignalProducer<User, NetworkError> let users = userIDs .producer // Signal to SignalProducer .flatMap(.latest) { userID in getUserID(userID) } // users: SignalProducer<User, NetworkError> 30 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
31. flatMap let userIDs: Signal<String, NoError> let getUserID: SignalProducer<User, NetworkError> let users = userIDs .producer // Signal to SignalProducer .flatMap(.latest) { userID in getUserID(userID) } // users: SignalProducer<User, NetworkError> 31 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
32. Combinations 32 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
33. merge combineLatest zip collect 33 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
34. Other 34 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
35. Let's go & Code 35 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
36. Workshop time Simple Signals & Merging 36 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
37. Workshop time Values and Errors 37 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
38. Workshop time Chaining and Compiler 38 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
39. Reactive Rocks? 39 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
40. Railway oriented Programming 40 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
41. Railway oriented Programming 41 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
42. SideEffects 42 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
43. Errors Layering 43 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
44. Domain Objects 44 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
45. Domain Objects Domain Errors 45 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
46. class API { enum Error: Swift.Error { case unauthorized case error(NSError) } func getUser() -> SignalProducer<JSON, Error> } 46 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
47. class API { enum Error: Swift.Error { case unauthorized case error(NSError) } func getUser() -> SignalProducer<JSON, Error> } 47 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
48. class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer<User, Error> { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 48 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
49. class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer<User, Error> { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 49 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
50. class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer<User, Error> { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 50 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
51. class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer<User, Error> { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 51 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
52. Example 52 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
53. Login -> Get User Info -> Get User Profile -> Allow User to Login -> 53 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
54. Flow 54 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
55. We need Reactive API! 55 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
56. public func reactive<Value>\( call: @escaping ( @escaping(Value) -> (), @escaping (NSError) -> () ) -> () ) -> SignalProducer<Value, Error> { return SignalProducer.init { o, l in call( { o.send(value: $0); o.sendCompleted()}, { o.send(error: .error($0)) }) } } 56 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
57. func getUser() -> SignalProducer<User, Error> { return reactive(call: Network.getUser) } 57 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
58. 58 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
59. Thank you 59 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
60. Reactive Programming Workshop by Paul Taykalo, Stanfy 60 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
61. The end 61 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
62. Links https://gist.github.com/JaviLorbada/ 4a7bd6129275ebefd5a6 https://fsharpforfunandprofit.com/rop/ 62 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13
63. More links 63 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13