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Reactive Programming Workshop by Paul Taykalo, Stanfy 1 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Plan 2 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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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

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About Reactive Programming 4 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Async vs Sync 5 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Everything is a Stream 6 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Stream of values over time 7 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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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

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Observable Signal SignalProduc 9 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal 10 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal 11 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal 12 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal 13 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal Events enum Event { case value(Value) case failed(Error) case completed case interrupted } 14 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal Termination enum Event { case value(Value) case failed(Error) // ❌ case completed // ❌ case interrupted // ❌ } 15 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal SignalProducer 16 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal SignalProducer 17 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Signal Producer vs Signal let tvSignal: Signal struct TV { let signal: Signal let channels: [SignalProducer] } 18 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Transformations 19 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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map Signal -> Signal 20 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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map let ints: Signal let strings = ints.map { int in "\(int)"} // string: Signal 21 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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mapError Signal -> Signal 22 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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mapError let ints: Signal let failableInts = ints.mapError { err in CustomError.failed } // string: Signal 23 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap Signal -> Signal 24 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap let strings: Signal let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal 25 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap let strings: Signal let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal 26 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap let strings: Signal let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal 27 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap let strings: Signal let ints = ints .flatMap(.latest) { string in guard let int = Int(string) else { return .init(error: CustomError.parsingFailed) } return .init(value: int) } // ints: Signal 28 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap let getUserID: SignalProducer let userIDs: SignalProducer let users = userIDs .producer .flatMap(.latest) { userID in getUserID(userID) } // users: SignalProducer 29 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap let userIDs: Signal let getUserID: SignalProducer let users = userIDs .producer // Signal to SignalProducer .flatMap(.latest) { userID in getUserID(userID) } // users: SignalProducer 30 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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flatMap let userIDs: Signal let getUserID: SignalProducer let users = userIDs .producer // Signal to SignalProducer .flatMap(.latest) { userID in getUserID(userID) } // users: SignalProducer 31 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Combinations 32 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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merge combineLatest zip collect 33 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Other 34 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Let's go & Code 35 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Workshop time Simple Signals & Merging 36 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Workshop time Values and Errors 37 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Workshop time Chaining and Compiler 38 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Reactive Rocks? 39 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Railway oriented Programming 40 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Railway oriented Programming 41 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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SideEffects 42 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Errors Layering 43 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Domain Objects 44 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Domain Objects Domain Errors 45 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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class API { enum Error: Swift.Error { case unauthorized case error(NSError) } func getUser() -> SignalProducer } 46 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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class API { enum Error: Swift.Error { case unauthorized case error(NSError) } func getUser() -> SignalProducer } 47 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 48 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 49 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 50 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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class UserModel { enum Error: Swift.Error { case fetchFailed case validationFailed } func getUser() -> SignalProducer { return api.getUser .mapError { e in .fetchFailed } .flatMap(.latest, validate) } } 51 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Example 52 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Login -> Get User Info -> Get User Profile -> Allow User to Login -> 53 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Flow 54 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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We need Reactive API! 55 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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public func reactive\( call: @escaping ( @escaping(Value) -> (), @escaping (NSError) -> () ) -> () ) -> SignalProducer { 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

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func getUser() -> SignalProducer { return reactive(call: Network.getUser) } 57 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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58 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Thank you 59 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Reactive Programming Workshop by Paul Taykalo, Stanfy 60 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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The end 61 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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Links https://gist.github.com/JaviLorbada/ 4a7bd6129275ebefd5a6 https://fsharpforfunandprofit.com/rop/ 62 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13

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More links 63 — Reactive Programming Workshop, by Paul Taykalo, #CocoaHeadsUkraine#13