Snippet 9: The late keyword

main.dart

// Sometimes fields in a class *should* be
// non-nullable, but can't be assigned a
// value right away. For cases like that,
// use the `late` keyword. It's a way to
// tell Dart that:
//
// * You aren't going to assign that
//   field a value right away.
// * But you *are* going to assign it a
//   value later.
// * And you'll make sure it's assigned a
//   value before it's accessed.
//
// If you declare a field `late` and it's
// read before it has a  value, a
// `LateInitializationError` is thrown to
// let you know what went wrong.
//
// Try using the `late` keyword to
// correct the following code. For a
// little extra fun afterward, try
// commenting out the line that sets
// `description`!

class Meal {
  String description;
  
  void setDescription(String str) {
    description = str;
  }
}

void main() {
  final myMeal = Meal();
  myMeal.setDescription('Feijoada!');
  print(myMeal.description);
}