importSwiftUI@mainstructLandmarksApp:App {// 4. use `@StateObject` to initialize a model object@StateObjectprivatevar modelData =ModelData()var body: some Scene {WindowGroup {/// The `WindowGroup` scene defined in the app body declares `ContentView`/// as the **root view** of the app.ContentView()// 5. put the model object in the environment .environmentObject(modelData) } }}