@Ben-G Ben-G released this Apr 20, 2017 · 57 commits to master since this release

Breaking API Changes:

  • Introduced a new Subscription API (#203) - @Ben-G, @mjarvis, @DivineDominion

    • The subscription API provides basic operators, such as skipRepeats (skip calls to newState unless state value changed) and select (sub-select a state).

    • This is a breaking API change that requires migrating existing subscriptions that sub-select a portion of a store's state:

      • Subselecting state in 3.0.0:

        store.subscribe(subscriber) { ($0.testValue, $0.otherState?.name) }
      • Subselecting state in 4.0.0:

        store.subscribe(subscriber) {
          $0.select {
            ($0.testValue, $0.otherState?.name)
    • For any store state that is Equatable or any sub-selected state that is Equatable, skipRepeats will be used by default.

    • For states/substates that are not Equatable, skipRepeats can be implemented via a closure:

      store.subscribe(subscriber) {
        $0.select {
            }.skipRepeats {
                return $0 == $1
  • Reducer type has been removed in favor of reducer function (#177) - Ben-G

    • Here's an example of a new app reducer, for details see the README:

      func counterReducer(action: Action, state: AppState?) -> AppState {
          var state = state ?? AppState()
          switch action {
          case _ as CounterActionIncrease:
              state.counter += 1
          case _ as CounterActionDecrease:
              state.counter -= 1
          return state
  • dispatch functions now return Void instead of Any (#187) - @Qata

    • The return type has been removed without any replacement, since the core team did not find any use cases of it. A common usage of the return type in redux is returning a promise that is fullfilled when a dispatched action is processed. While it's generally discouraged to disrupt the unidirectional data flow using this mechanism we do provide a dispatch overload that takes a callback argument and serves this purpose.
  • Make dispatch argument in middleware non-optional (#225) - @dimazen, @mjarvis, @Ben-G

  • Middleware now has a generic type parameter that is used for the getState method and matches the Store's State type. This allows accessing the state in middleware code without type casting (#226) - @mjarvis


  • Extend StoreType with substate selector subscription (#192) - @mjarvis
  • Add DispatchingStoreType protocol for testing (#197) - @mjarvis
  • Installation guide for Swift Package Manager - @thomaspaulmann
  • Update documentation to reflect breaking API changes - @mjarvis
  • Clarify error message on concurrent usage of ReSwift - @langford