Dart is an optional typed language. So the type of e is not required. you have to use the following syntax to catch only SomeException : try { // … } on SomeException catch(e) { //Handle exception of type SomeException } catch(e) { //Handle all other exceptions } See catch section of Dart: Up and … Read more
One thing to keep in mind: if you are using the IntelliJ IDE, just a simple copy/paste of Java code can convert it to Kotlin. Coming to your question, now. If you want to create a custom Exception, just extend Exception class like: class TestException(message:String): Exception(message) and throw it like: throw TestException(“Hey, I am testing … Read more
The answer is that this is the (somewhat surprising) semantics of imprecise exceptions When pure code can be shown to evaluate to a set of exceptional values (i.e. the value of error or undefined, and explicitly not the kind of exceptions generated in IO), then the language permits any value of that set to be … Read more
Exceptions make it really easy to write code where an exception being thrown will break invariants and leave objects in an inconsistent state. They essentially force you to remember that most every statement you make can potentially throw, and handle that correctly. Doing so can be tricky and counter-intuitive. Consider something like this as a … Read more
The rule of thumb is that you should use assertions when you are trying to catch your own errors, and exceptions when trying to catch other people’s errors. In other words, you should use exceptions to check the preconditions for the public API functions, and whenever you get any data that are external to your … Read more
Have you tried adding the __fieldname on those Lingua references in the ListinoTraduttoreAdmin search_fields, like: class ListinoTraduttoreAdmin(admin.ModelAdmin): list_display = (“traduttore”, “linguaDa”, “linguaA”, “prezzoParola”, “prezzoRiga”, “scontoCat”, “scontoFuzzy”, “scontoRipetizioni”) search_fields = [‘traduttore__nome”, “linguaDa__field1”, “linguaA_field2”]
Someone posted this link to the MDN in a comment, and I think it was very helpful. It describes things like ErrorTypes very thoroughly. EvalError — Creates an instance representing an error that occurs regarding the global function eval(). InternalError — Creates an instance representing an error that occurs when an internal error in the … Read more
Have you ever tried to debug a program raising five exceptions per second in the normal course of operation ? I have. The program was quite complex (it was a distributed calculation server), and a slight modification at one side of the program could easily break something in a totally different place. I wish I … Read more
The constructor’s job is to bring the object into a usable state. There are basically two schools of thought on this. One group favors two-stage construction. The constructor merely brings the object into a sleeper state in which it refuses to do any work. There’s an additional function that does the actual initialization. I’ve never … Read more
A method should only catch an exception when it can handle it in some sensible way. Otherwise, pass it on up, in the hope that a method higher up the call stack can make sense of it. As others have noted, it is good practice to have an unhandled exception handler (with logging) at the … Read more