custom_error_handler.dart

void main() {
  dynamic r1 = CustomErrorHandler<dynamic>().execute(
    mightThrow: () => []..elementAt(2),
    onError: (e) => print("Found Error: <$e>"),
    shouldRethrow: false,
  );
  print(r1);
  
  dynamic r2 = CustomErrorHandler<int>().execute(
    mightThrow: () => 1 ~/ 0,
    onError: (e) => print("Found Error: <$e>"),
    shouldRethrow: false,
  );
  print(r2);
}


class CustomErrorHandler<T> {
  T execute({
    T Function() mightThrow,
    void Function(dynamic e) onError,
    bool shouldRethrow=true,
  }) {
    try {
      return mightThrow();
    } catch (e) {
      onError(e);
      if (shouldRethrow) {
        throw e;  
      }
      return null;
    }
  }
}