marcinOz

// Assign a value to b if b is null; otherwise, b stays the same
b ??= value;

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final s = ["d", "e", "f"];
final s2 = ["a", "b", "c", ...s];
print(s2); // [a, b, c, d, e, f]

var s;
final s2 = ["a", "b", "c", ...?s];
print(s2); // [a, b, c]

marcinOz

val s = arrayOf("d", "e", "f")
val s2 = listOf("a", "b", "c", *s)
println(s2) // [a, b, c, d, e, f]

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final person = Person() 
    ..name = "Marcin" 
    ..surname = "Oziemski" 
    ..age = 99

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val person = Person().apply { 
    name = "Marcin" 
    surname = "Oziemski"
    age = 99
}

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_navigate(Store<AppState> store, action, NextDispatcher next) {
 if (action is NavigatePopAction && navigatorKey.currentState.canPop()) {
   navigatorKey.currentState.pop();
 } else if (action is NavigatePushAction) {
   if (store.state.route.last != action.routeName) {
     navigatorKey.currentState.pushNamed(action.routeName);
   }
 }
 next(action); //This need to be after name checks
}

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class FabRoute<T> extends MaterialPageRoute<T> {
  FabRoute(Widget widget, {RouteSettings settings})
      : super(
            builder: (_) => RouteAwareWidget(child: widget),
            settings: settings);

  @override
  Widget buildTransitions(BuildContext context, Animation<double> animation,
      Animation<double> secondaryAnimation, Widget child) {
    if (settings.isInitialRoute) return child;

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final RouteObserver<PageRoute> routeObserver = RouteObserver<PageRoute>();

class RouteAwareWidget extends StatefulWidget {
  final Widget child;

  RouteAwareWidget({this.child});

  State<RouteAwareWidget> createState() => RouteAwareWidgetState(child: child);
}

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List<Middleware<AppState>> createNavigationMiddleware() {
  return [
    TypedMiddleware<AppState, NavigateReplaceAction>(_navigateReplace),
    TypedMiddleware<AppState, NavigatePushAction>(_navigate),
  ];
}

_navigateReplace(Store<AppState> store, action, NextDispatcher next) {
  final routeName = (action as NavigateReplaceAction).routeName;
  if (store.state.route.last != routeName) {

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      floatingActionButton: FloatingActionButton(
        onPressed: () => StoreProvider.of<AppState>(context)
            .dispatch(NavigatePushAction(AppRoutes.addGame)),
        tooltip: 'Add new game',
        child: Icon(Icons.add),
      ),