If I define custom error classes like this:
class MyCustom Error extends Error{ }
How can I catch multiple errors like this:
try{
if(something)
throw MyCustomError();
if(something_else)
throw Error('lalala');
}catch(MyCustomError err){
}catch(err){
}
?
The code above does not work and gives some syntax error
The MDN docs recommends using an if/else block inside the catch statement. This is because it is impossible to have multiple catch statements and you cannot catch specific errors in that way.
try {
myroutine(); // may throw three types of exceptions
} catch (e) {
if (e instanceof TypeError) {
// statements to handle TypeError exceptions
} else if (e instanceof RangeError) {
// statements to handle RangeError exceptions
} else if (e instanceof EvalError) {
// statements to handle EvalError exceptions
} else {
// statements to handle any unspecified exceptions
logMyErrors(e); // pass exception object to error handler
}
}
JavaScript is weakly typed. Use if (err instanceof MyCustomError) inside the catch clause.
