Examples of View redrawing in SwiftUI

Observable.swift

@Observable
class VM {
    var counter = 0
}

struct ContentView: View {
    @State var vm = VM()
    
    var body: some View {
        // doesn't get executed on button tap
        let _ = Self._printChanges()
        VStack {
            Button("Increase") { vm.counter += 1 }
            OtherView()
        }
        .environment(vm)
    }
}

struct OtherView: View {
    @Environment(VM.self) var vm
    
    var body: some View {
        // doesn't get executed on button tap
        let _ = Self._printChanges()
        Text("Just view")
    }
}

ObservableObject.swift

class VM: ObservableObject {
    @Published var counter = 0
}

struct ContentView: View {
    @StateObject var vm = VM()
    
    var body: some View {
        // executes every time, when button tapped
        let _ = Self._printChanges()
        VStack {
            Button("Increase") { vm.counter += 1 }
            OtherView()
        }
        .environmentObject(vm)
    }
}

struct OtherView: View {
    @EnvironmentObject var vm: VM
    
    var body: some View {
        // executes every time, when button tapped
        let _ = Self._printChanges()
        Text("Just view")
    }
}

StateBinding.swift

struct ContentView: View {
    @State var counter = 0
    
    var body: some View {
        // doesn't get executed on button tap
        let _ = Self._printChanges()
        VStack {
            Button("Increase") { counter += 1 }
            OtherView(counter: $counter)
        }
    }
}

struct OtherView: View {
    @Binding var counter: Int
    
    var body: some View {
        // doesn't get executed on button tap
        let _ = Self._printChanges()
        Text("Just view")
    }
}