problem_with_dart_constructors_and_default_values.dart

class Cool {
  final int count;
  Cool({ int? count = 20 }): this.count = count ?? 20;
}

class NotCool {
  final int count;
  NotCool({ this.count = 20 });
}


void main() {
  
  int? myArg = null;

  Cool(
    count: myArg
  );
  NotCool(
    // invoke without having to know the default value is impossible...
    count: myArg ?? 20
  );
  
}