Switch on a Set using List literals as cases in Dart.

main.dart

// Switch on a Set using List literals as cases in Dart.
// Can be really useful to avoid many if/else statements.

enum Direction { up, down, left, right }

class MapTile {
  var directions = Set<Direction>();

  String render() {
    switch (directions.toList()) {
      case [Direction.up, Direction.down]:
        return 'map_tile_vertical.png';
      case [Direction.left, Direction.right]:
        return 'map_tile_horizontal.png';
      default:
        return 'default.png';
    }
  }
}

void main() {
  final mapTile = MapTile();
  mapTile.directions = const {Direction.up};
  print(mapTile.render());
}

https://dartpad.dartlang.org/9ed0ec3f00f9691fab14563f1d864515