Using Functional Reactive Programming in Production

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USING FUNCTIONAL REACTIVE PROGRAMMING IN PRODUCTION

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WHO IS FAMILIAR WITH   FUNCTIONAL REACTIVE PROGRAMMING (FRP)?

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WHO IS FAMILIAR WITH   FUNCTIONAL REACTIVE PROGRAMMING (FRP)? !

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WHAT IS FUNCTIONAL REACTIVE PROGRAMMING?

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WHAT IS FUNCTIONAL REACTIVE PROGRAMMING?

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Erica Sadun http://ericasadun.com/2016/11/08/swift-by-emoji-a-considered-approach/

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Erica Sadun http://ericasadun.com/2016/11/08/swift-by-emoji-a-considered-approach/

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Erica Sadun http://ericasadun.com/2016/11/08/swift-by-emoji-a-considered-approach/

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BUT WHAT IS FUNCTIONAL REACTIVE PROGRAMMING?

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STREAMS + TRANSFORMATIONS + BINDINGS = FUNCTIONAL REACTIVE PROGRAMMING Functional Reactive Awesomeness With Swift, by Ash Furrow  https://realm.io/news/altconf-ash-furrow-functional-reactive-swift/

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STREAMS SEND STUFF STREAMS > TRANSFORMATIONS > BINDINGS

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THEY CAN TRANSFORM STREAMS > TRANSFORMATIONS > BINDINGS

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AND BIND TO THINGS STREAMS > TRANSFORMATIONS > BINDINGS

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STREAMS + TRANSFORMATIONS + BINDINGS = FUNCTIONAL REACTIVE PROGRAMMING

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FOR CODE EXAMPLES!

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REAL LIFE EXAMPLE

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ReactiveSwift

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let scoreHome = MutableProperty(0) let scoreAway = MutableProperty(0)

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let scoreHome = MutableProperty(0) let scoreAway = MutableProperty(0) let scoreProducer = SignalProducer .combineLatest(scoreHome.producer, scoreAway.producer) // Create a stream

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let scoreHome = MutableProperty(0) let scoreAway = MutableProperty(0) let scoreProducer = SignalProducer .combineLatest(scoreHome.producer, scoreAway.producer) // Create a stream .map({ (scoreHome, scoreAway) -> String in return "Home \(scoreHome) - \(scoreAway) Away" // Transform the value }) scoreboardLabel.reactive.text <~ scoreProducer // Bind to the label func homeScored(){ scoreHome.value += 1 } func awayScored(){ scoreAway.value += 1 } homeScored() // scoreboardLabel.text = “Home 1 - 0 Away” awayScored() // scoreboardLabel.text = “Home 1 - 1 Away” awayScored() // scoreboardLabel.text = “Home 1 - 2 Away”

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scoreboardLabel.reactive.text <~ viewModel.scoreProducer // Bind to the label USING FRP IN PRODUCTION WITH MVVM

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ReactiveSwift RxSwift

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RxSwift vs ReactiveSwift

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Languages Java: RxJava JavaScript: RxJS C#: Rx.NET C#(Unity): UniRx Scala: RxScala Clojure: RxClojure C++: RxCpp Lua: RxLua Ruby: Rx.rb Python: RxPY Groovy: RxGroovy JRuby: RxJRuby Kotlin: RxKotlin Swift: RxSwift PHP: RxPHP RxSwift vs ReactiveSwift

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let scoreHome = MutableProperty(0) let scoreAway = MutableProperty(0) ReactiveSwift RxSwift let scoreHome = Variable(0) let scoreAway = Variable(0)

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SignalProducer .combineLatest( scoreHome.producer, scoreAway.producer ) Observable .combineLatest( scoreHome.asObservable(), scoreAway.asObservable()){ return ($0, $1) } ReactiveSwift RxSwift

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CHOOSE THE ONE WHICH SUITS YOU '()

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SO.. WHY FRP?

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IS A DIGITAL AGENCY

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DIGITAL AGENCY > MANY APPS

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IMPLEMENTING PATTERNS MULTIPLE TIMES

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MAKE IT EASY TO IMPLEMENT COMMON PATTERNS

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MANY PROJECTS > IMPLEMENTING PATTERNS MULTIPLE TIMES > A LOT OF SWITCHING BETWEEN PROJECTS FOR DEVS

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MANY PROJECTS BUILDING PATTERNS MULTIPLE TIMES > INTERNAL FRAMEWORKS A LOT OF SWITCHING BETWEEN PROJECTS > COMMON PROJECT SETUP

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> EASIER ADOPTION (ALSO FOR NEWBIES) < MANY PROJECTS BUILDING PATTERNS MULTIPLE TIMES > INTERNAL FRAMEWORKS A LOT OF SWITCHING BETWEEN PROJECTS > COMMON PROJECT SETUP

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CREATE A COMMON PROJECT SETUP

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CREATE A COMMON PROJECT SETUP CREATE INTERNAL FRAMEWORKS

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INTERNAL FRAMEWORKS

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INTERNAL FRAMEWORKS - TIFNetwork - TIFUIElements - TIFExtensions - TIFGoogleCast - TIFChatbot - ALDataRequestView - ALReactiveCocoaExtension Many more..

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INTERNAL FRAMEWORKS AS A SOLUTIONS FOR COMMON PATTERNS - Networking implementations - Networking failure - Calls signing - Empty datasets - Loading states

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SO.. WHY FRP?

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- Networking implementations - Networking failure - Calls signing - Empty datasets - Loading states FRP TO GLUE THIS TOGETHER FRP INTERNAL FRAMEWORKS AS A SOLUTIONS FOR COMMON

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LET’S DIVE INTO THIS

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TIFNETWORK

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TIFNETWORK MOYA

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let RACProvider = ReactiveCocoaMoyaProvider(])

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enum ExampleAPI { case getArray }

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extension ExampleAPI: JSONMappableTargetType { var baseURL: URL { return URL(string: "https://httpbin.org")! } var path: String { switch self { case .getArray: return "/getarray" } } var method: Moya.Method { return .get } var parameters: [String: Any]? { return nil } var sampleData: Data { switch self { case .getArray: return stubbedResponseFromJSONFile("array_response") } } }

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RACProvider.request(token: ExampleAPI.getArray) // Create a stream .map(to: [GetResponse.self]) // Transform the value (response data) .on(value: { (array) in print(array.count) // Prints the count of the objects }, failed: { (error) in print(error) // Prints the error }) .start() // Start the data request

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MAKING USE OF FRP

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MAKING USE OF TRANSFORMATIONS

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CALL SIGNING extension BuienradarAPI : TIFRACAPI { public func request() -> SignalProducer { return BRCallSigningManager.sharedManager.refreshSigningKeyIfNeeded().flatMap(.Latest) { (_) -> SignalProducer in return TIFProvider.request(self) } } }

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REQUEST STREAM >✅> PERFORM SIGNED REQUEST✅

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REQUEST STREAM >❌> PERFORM SIGNED REQUEST❌

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REQUEST STREAM >❌> PERFORM KEY REFRESH REQUEST > PERFORM SIGNED REQUEST✅

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PLUGINS INFLIGHTS TRACKING STUBBED PROVIDER SUPPORT FOR REACTIVESWIFT & RXSWIFT and more.. Moya  https://github.com/Moya/Moya

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CONNECTING TO ALDATAREQUESTVIEW WITH FRP

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ALDATAREQUESTVIEW IN BUIENRADAR LOADING FAILED SUCCESS

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VIDEOLAND AND ALDATAREQUESTVIEW

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VIDEOLAND AND ALDATAREQUESTVIEW LOADING EMPTY FAILED SUCCESS

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ALDATAREQUESTVIEW > 4 STATES • STREAM STARTS > SHOW LOADING VIEW • STREAM FAILS > SHOW FAILURE VIEW • STREAM SUCCESS & EMPTY > SHOW EMPTY VIEW • STREAM SUCCESS & DATA > HIDE

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dataRequestView = ALDataRequestView(forAutoLayout: ()) dataRequestView?.hidden = true dataRequestView?.dataSource = dataRequestViewDataSource view.addSubview(dataRequestView!) dataRequestView?.autoPinEdgesToSuperviewEdges() CONNECTING TO ALDATAREQUESTVIEW WITH FRP

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BuienradarAPI.WeatherVideoList() .request() // Create stream .map(to: [BRWeatherVideo]) // Transform .onNext { [weak self] (weatherVideos) -> () in self?.weatherVideos = weatherVideos self?.collectionView.reloadData() }.start() CONNECTING TO ALDATAREQUESTVIEW WITH FRP

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public protocol ALDataRequestViewDataSource : class { func loadingViewForDataRequestView(dataRequestView: ALDataRequestView) -> UIView? func reloadViewControllerForDataRequestView(dataRequestView: ALDataRequestView) -> ALDataReloadType? func emptyViewForDataRequestView(dataRequestView: ALDataRequestView) -> UIView? func hideAnimationDurationForDataRequestView(dataRequestView: ALDataRequestView) -> NSTimeInterval func showAnimationDurationForDataRequestView(dataRequestView: ALDataRequestView) -> NSTimeInterval } ALDataRequestView, by A. van der Lee  https://github.com/AvdLee/ALDataRequestView CONNECTING TIFNETWORK TO ALDATAREQUESTVIEW

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DEMO: REVEAL RAFFLE Source: https://github.com/AvdLee/MeetupRafﬂe

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DEMO: REVEAL RAFFLE 15% DISCOUNT CODE: AMSTERDAM-DO-IOS-NOV16 (valid until the 31st of November).

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OTHER FRP IDEAS BASED ON .attachToSignalProducerReloader(foregroundReloader, reloadAction: reloaderReloadAction) UIApplicationDidBecomeActive

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OTHER FRP IDEAS BASED ON .attachToSignalProducerReloader(appearReloader, reloadAction: reloaderReloadAction) override func viewDidAppear(animated: Bool) { super.viewDidAppear(animated) appearReloader.viewAppeared() }

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THAT’S IT! :-)

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THANKS!! @twannl avdlee www.avanderlee.com RESOURCES: https://github.com/AvdLee/Moya-JASONMapper https://github.com/Moya/Moya https://github.com/ReactiveX/RxSwift https://github.com/ReactiveCocoa/ReactiveSwift https://github.com/AvdLee/ALDataRequestView https://github.com/AvdLee/ALReactiveCocoaExtension http://www.avanderlee.com/reactivecocoa/moya-with-swiftyjson/ https://github.com/AvdLee/MeetupRaffle