Handling specific errors in JavaScript (think exceptions)

Question

How would you implement different types of errors, so you\'d be able to catch specific ones and let others bubble up..?

One way to achieve this is to modify the

Answer 1

As noted in the comments below this is Mozilla specific, but you can use 'conditional catch' blocks. e.g.:

try {
  ...
  throwSpecificError();
  ...
}
catch (e if e.sender === "specific") {
  specificHandler(e);
}
catch (e if e.sender === "unspecific") {
  unspecificHandler(e);
}
catch (e) {
  // don't know what to do
  throw e;
} 

This gives something more akin to typed exception handling used in Java, at least syntactically.