🚦data flow
// value type : ■ internal, □ external
// reference type: ● internal, ○ external
@State private var isOn = true // ■
@Binding var isOn: Bool // □
@StateObject private var user = User() // ●
@ObservedObject var user: User // ○
@EnvironmentObject var modelData: ModelData // ○WWDC2019 ⟩ Data Flow Through SwiftUI
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