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func reduce(state: NewsState, event: AppEvent) -> NewsState

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func reduce(state: AppState, event: AppEvent) -> AppState

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func reduce(state: NewsState, event: NewsEvent) -> NewsState

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let firstReducer: Reducer = { state, event in
    var state = state
    switch event {
    case .newUserWasLoaded(let user):
        state.user = user
    default:
        return state
    }
    return state
}

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func combine(_ reducers: Reducer...) -> Reducer {
    return { state, event in
        reducers.reduce(state) { state, reducer in
            reducer(state, event)
        }
    }
}

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func combine(_ reducers: Reducer...) -> Reducer

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typealias Reducer = (AppState, AppEvent) -> AppState

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extension AppEvent {
    static func reduce(state: AppState, event: AppEvent) -> AppState {
        var state = state
        switch event {
        case .newUserWasLoaded(let user):
            state.user = user
        case .newsEvents(let event):
            if state.newsState == nil {
                state.newsState = NewsState(user: state.user, step: .initial)
            }

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extension AppEvent {
    static func reduce(state: AppState, event: AppEvent) -> AppState {
        var state = state
        switch event {
        case .newUserWasLoaded(let user):
            state.user = user
        case .newsEvents(let event):
            if state.newsState == nil {
                state.newsState = NewsState(user: state.user, step: .initial)
            }

atimca

extension AppEvent {
    static func reduce(state: AppState, event: AppEvent) -> AppState {
        var state = state
        switch event {
        case .newUserWasLoaded(let user):
            state.user = user
        case .newsEvents(let event):
            switch event {
            case .dataLoaded(let data):
                state.newsState?.step = .loaded(data: data)