-> Bool { lhs.contains(rhs) } } let vegitablesIDs: Set<Int> = [1, 2, 3] let fruitsIDs: Set<Int> = [4, 5, 6] func printPlantCategory(plantID: Int) { switch plantID { case vegitablesIDs: print("vegitables") case fruitsIDs: print("fruits") default: print("not vegitables nor fruits") } }