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Sergey Leschev
Sergey Leschev

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Redux-like state container in SwiftUI. Reducer composition.

Important component of Redux-like state container is Reducer. We can extract and compose it as we do with state struct. It will allow us to respect a Single Responsibility principle and keep our reducers small and clean.

enum AppAction {
    case calendar(action: CalendarAction)
    case trends(action: TrendsAction)

func trendsReducer(
    state: inout TrendsState,
    action: TrendsAction
) -> AnyPublisher<TrendsAction, Never> {
    // Implement your state changes here

func calendarReducer(
    state: inout CalendarState,
    action: CalendarAction
) -> AnyPublisher<CalendarAction, Never>{
    // Implement your state changes here

func appReducer(
    state: inout AppState,
    action: AppAction
) -> AnyPublisher<AppAction, Never> {
    switch action {
    case let .calendar(action):
        return calendarReducer(&state.calendar, action)
    case let .trends(action):
        trendsReducer(&state.trends, action)

    return Empty().eraseToAnyPublisher()
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Redux provides a single source of truth, which eliminates tons of bugs produced by multiple states across the app. Best practices. Normalization and composition keep our app state simple and maintainable.

I have a clear focus on time-to-market and don't prioritize technical debt. And I took part in the Pre-Sale/RFX activity as a System Architect, assessment efforts for Mobile (iOS-Swift, Android-Kotlin), Frontend (React-TypeScript) and Backend (NodeJS-.NET-PHP-Kafka-SQL-NoSQL). And I also formed the work of Pre-Sale as a CTO from Opportunity to Proposal via knowledge transfer to Successful Delivery.

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