DART

dart try-catch

try {
  // ...
} on SomeException catch(e) {
 //Handle exception of type SomeException
} catch(e) {
 //Handle all other exceptions
}

dart try catch

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');
} finally {							// Always clean up, even if case of exception
  cleanLlamaStalls();
}

try except flutter

try {
  print(x);
} on Exception catch (_) {
  print('never reached');
}