Refactor catch statements

Question

We have many try-catch blocks in our code handling the exceptions of the api calls. Since most of the catch blocks are identical we want to refactor them and only them (because the try blocks should stay in the place they are). How is this possible in Flutter?

Example code:

try {
  _userData = apiService.call("user_data");
} on ResourceNotFoundException {
  handleResourceNotFoundException();
} on NetworkException {
  handleNetworkException();
}

Answer 1

The best solution I found is using a general catch, fit everything into a handleException function, and in there rethrow the exception again.

try {
  _userData = apiService.call("user_data");
} on catch (e) {
  handleException(e);
}


void handleException(e) {
   try {
      throw e;
   } on ResourceNotFoundException {
      handleResourceNotFoundException();
   } on NetworkException {
      handleNetworkException();
   }
 }

This way it is possible to reuse the exception handling logic and also extend it.