RxFeedback

TypeScript/JavaScript version of RxFeedback

20min video pitch

The simplest architecture for RxJS

    type FeedbackLoop<State, Event> = 
        (state: rx.Observable<State>, scheduler: IScheduler) => rx.Observable<Event>;
 
    declare module 'rxjs/Observable' {
        namespace Observable {
            function system<State, Event>(
                initialState: State,
                reduce: (state: State, event: Event) => State,
                feedback: FeedbackLoop<State, Event>[],
            ): Observable<State>;
        }
    }

Why

• Straightforward

  • If it did happen -> Event
  • If it should happen -> Request
  • To fulfill Request -> Feedback loo

• Declarative

  • System behavior is first declaratively specified and effects begin after subscribe is called => Compile time proof there are no "unhandled states"

• Debugging is easier

  • A lot of logic is just normal pure function that can be debugged using Xcode debugger, or just printing the commands.

• Can be applied on any level

  • Entire system
  • application (state is stored inside a database, CoreData, Firebase, Realm)
  • view controller (state is stored inside system operator)
  • inside feedback loop (another system operator inside feedback loop)

• Works awesome with dependency injection

• Testing

  • Reducer is a pure function, just call it and assert results
  • In case effects are being tested -> TestScheduler

• Can model circular dependencies

• Completely separates business logic from effects (Rx).

  • Business logic can be transpiled between platforms

Installing with NPM

$ npm install rxfeedback

import * as RxFeedback from 'rxfeedback';