The default value of an optional parameter must be constant

Question

So Im creating this Event Tracker app and I have two screens which are the map and the events list. I am trying to get the place list to be equal to my places in my App state. B

Answer 1

A common workaround to requiring constant values for default arguments is to instead provide a sentinel argument as the default that can be const. Typically that sentinel argument can be null:

class AppState {
   AppState({
    List<Place> places,
    ...
   }) : places = places ?? PlaceMapState.placeList,
        assert(places != null),
        assert(selectedCategory != null);