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struct AppState {
    var value1: Int = 0
    var value2: Int = 0
    var value3: Int = 0
}

extension AppState {

    struct Injection: EnvironmentKey {
    

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struct ContentView: View {
    
    // The local view's state encapsulated in one container:
    @State private var state = ViewState()
    
    // The app's state injection
    @Environment(\.injected) private var injected: AppState.Injection
    
    var body: some View {
        Text("Value: \(state.value)")

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struct CustomView: View {
    @EnvironmentObject var appState: Deduplicated<AppState, Snapshot>
    
    var body: some View {
        Text("Value: \(appState.value)")
    }
}

let view = CustomView()
    .environmentObject(appState

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struct CustomView: View {
    @EnvironmentObject var appState: AppState
    
    var body: some View {
        Text("Value: \(appState.value)")
    }
}

let view = CustomView()
    .environmentObject(appState)

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object.objectWillChange
    .delay(for: .nanoseconds(1), scheduler: RunLoop.main)
    .compactMap { _ in makeSnapshot() }
    .prepend(makeSnapshot())
    .removeDuplicates()
    .dropFirst()
    .sink { [weak self] _ in
        self?.objectWillChange.send()
    }

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struct CustomView: View {
    @EnvironmentObject var appState: AppState
    private var prevValue: Int
    
    var body: some View {
        self.prevValue = appState.value
        return Text("Value: \(appState.value)")
    }
}

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class AppState: ObservableObject {
    @Published var value: Int = 0
}

struct CustomView: View {
    @EnvironmentObject var appState: AppState
    
    var body: some View {
        Text("Value: \(appState.value)")
    }

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//
//  Deduplicated.swift
//  CountriesSwiftUI
//
//  Created by Alexey Naumov on 17.12.2019.
//  Copyright © 2019 Alexey Naumov. All rights reserved.
//
import Foundation
import Combine

nalexn

struct ContentView: View {
    @State var selectedAnnotation: MKAnnotationID?
    @State var annotations: [MKAnnotation] = []
    
    var body: some View {
        ZStack {
            MapView(selected: self.$selectedAnnotation, annotations: self.$annotations)
            ForEach(self.annotations) { annotation in
                NavigationLink(
                    destination: AnnotationDetailsView(annotation: annotation),

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