Created
February 28, 2020 08:40
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Draft implementation of a Store in swift
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| public final class Store<Value: Equatable, Action> { | |
| private let reducer: (inout Value, Action) -> Void | |
| private var _observable: BehaviorSubject<Value> | |
| public var observable: Observable<Value> { | |
| get { | |
| return _observable.distinctUntilChanged() | |
| } | |
| } | |
| private var value: Value { | |
| didSet { | |
| _observable.onNext(value) | |
| } | |
| } | |
| private var disposeBag = DisposeBag() | |
| public init(initialValue: Value, reducer: @escaping (inout Value, Action) -> Void) { | |
| self.reducer = reducer | |
| self.value = initialValue | |
| self._observable = BehaviorSubject(value: value) | |
| } | |
| public func send(_ action: Action) { | |
| self.reducer(&value, action) | |
| } | |
| public func view<LocalValue, LocalAction>( | |
| value toLocalValue: @escaping (Value) -> LocalValue, | |
| action toGlobalAction: @escaping (LocalAction) -> Action | |
| ) -> Store<LocalValue, LocalAction> { | |
| let localStore = Store<LocalValue, LocalAction>( | |
| initialValue: toLocalValue(self.value), | |
| reducer: { localValue, localAction in | |
| self.send(toGlobalAction(localAction)) | |
| localValue = toLocalValue(self.value) | |
| } | |
| ) | |
| self.observable.subscribe(onNext: { [weak localStore] newValue in | |
| localStore?.value = toLocalValue(newValue) | |
| }).disposed(by: disposeBag) | |
| return localStore | |
| } | |
| } |
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