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/// Model struct Cinnamon { let value: Int = 0 } enum Event { case increase } 45

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/// Model struct Cinnamon { let value: Int = 0 } enum Event { case increase } func reducer(state: Cinnamon, event: Event) -> Cinnamon { var newState = state if event == .increase { newState.value += 1 } return newState } /// UI let builder = Form(state: Cinnamon(), reducer: reducer) 46

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struct AddressBook { var contacts: [Person] var searchTerm: String var scrollPosition: Int } 50

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struct AddressBookApp { struct Data { var contacts: [Person] } var data: Data struct UI { var searchTerm: String var scrollPosition: Int } var ui: UI } 51

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private var subscribers: [String: (State)->Void] = [:] public func subscribe(_ subscriber: @escaping (State)->Void) -> String { let token = UUID().uuidString subscribers[token] = subscriber subscriber(state) return token } 66

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protocol FormComponent { associatedtype State func setup(with state: State) func update(state: State) -> Void } public func subscribe (_ subscriber: Component) -> String where Component.State == State {... 68

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func subscribe( path: KeyPath, action: @escaping (_ oldValue: Type, _ newValue: Type) -> Void ) -> String struct Person { let name: String } form.subscribe(path: \Person.name) { (old, new) in ... } 70

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private var history: [State] = [] func apply(_ change: (inout State) -> Void) { states.append(state) change(&state) notifySubscribers() } func undo() { state = history.popLast() notifySubscribers() } 71

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