RxSwift Xcoders Riga meetup

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RxSwift Introduction to reactive programming Kristaps Grinbergs @fassko

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RxSwift isn't KVO, ReactNative or ReactJS

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About me ● Swift developer at Qminder ● BCompSci & MComSci unfinished DmCompSci ● > 15 years in IT ● love open source

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Agenda ● What is Rx ● RxSwift and building blocks ● Examples ● Pros and Cons

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Imperative programming ● Saved state ● Order of execution ● Side effects

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In computing, reactive programming is a programming paradigm oriented around data flows and the propagation of change. Wikipedia

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Reactive programming is programming with asynchronous data streams

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Reactive programming ● Asynchronous ● No saved state ● Functional ● Responsive

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ReactiveX An API for asynchronous programming with observable streams. ● Microsoft (Rx.NET) - 2009 ● Supports many languages ● RxSwift - 2015

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Rx components ● Observable ● Observers ● Schedulers

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Observables Completed and Error will terminate the stream Next Completed Error

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Operators Filtering Transforming Combining

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RxMarbles.com

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UI bindings RxCocoa

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Testing ● Async XCTest with expectations ● RxBlocking making it synchronous ● Using RxTest and custom Schedulers ● https://www.raywenderlich.com/7408-testing-your-rxswift-code ● https://www.youtube.com/watch?v=FgbTenGH-P0

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+ Agile and reusable code Thread safety Eliminate state from code Testing Well tested Error handling Large community and extensions Extends MVVM

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- Steep learning curve Change previous practices Debugging Testing Over-reactive Overhead

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Resources ● http://reactivex.io/ ● https://github.com/ReactiveX/RxSwift ● https://github.com/RxSwiftCommunity ● http://adamborek.com/ ● http://rx-marin.com/ ● RayWenderlich RxSwift book ● Shai Michal presentations

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