exceptions

main.dart

class OutOfLlamasException {}

breedMoreLlamas() {}
buyMoreLlamas() {}
cleanLlamaStalls() {}

class Point {}

main() {
  var numberOfLlamas = 1;
  if (numberOfLlamas <= 0) {
    throw new StateError(
        'Value must be greater than zero');
  }
  if (numberOfLlamas <= 0) {
    throw 'Out of llamas!';
  }

  distanceTo(Point other) =>
      throw new UnimplementedError();

  try {
    breedMoreLlamas();
  } on OutOfLlamasException {
    buyMoreLlamas();
  }

  try {
    breedMoreLlamas();
  } on OutOfLlamasException {
    // A specific exception
    buyMoreLlamas();
  } on Exception catch (e) {
    // Anything else that is an exception
    print('Unknown exception: $e');
  } catch (e) {
    // No specified type, handles all
    print('Something really unknown: $e');
  }

  try {
    breedMoreLlamas();
  } finally {
    // Always clean up, even if an exception is thrown.
    cleanLlamaStalls();
  }

  try {
    breedMoreLlamas();
  } catch (e) {
    print('Error: $e'); // Handle the exception first.
  } finally {
    cleanLlamaStalls(); // Then clean up.
  }
  
  try {
    throw new FormatException('Expected at least 1 section');
  } on FormatException catch (e) {
    print(e);
  }
}