CombineLatest.swift

@Published var state1 = "0"
@Published var state2 = "a"

func combineLatestExample() {
  $state1.combineLatest($state2)
    .sink { value in
      print("sink", value)
    }
    .store(in: &cancellables)
        
    print("will change state1 to 1")
    state1 = "1"
    print("will change state1 to 2")
    state1 = "2"
    print("will change state2 to b")
    state2 = "b"
    print("will change state1 to 3")
    state1 = "3"
    print("will change state2 to c")
    state2 = "c"
}
/* example
sink ("0", "a")
will change state1 to 1
sink ("1", "a")
will change state1 to 2
sink ("2", "a")
will change state2 to b
sink ("2", "b")
will change state1 to 3
sink ("3", "b")
will change state2 to c
sink ("3", "c")
*/