Is this what you want?:
try{
doSomething();
}
catch(e if e instanceof Error){
handleError(e);
}
Kris
On Nov 30, 1:41 am, "Peter Michaux" <[EMAIL PROTECTED]> wrote:
> I have a piece of code using a try-catch where I really only want to
> catch exceptions under certain conditions. For example. In Java I
> could write the following to catch only a certain type of exception
>
> try {
> doSomething();}
>
> catch (MyError e) {
> handleError()
>
> }
>
> In JavaScript I can write the more verbose
>
> try {
> doSomething();}
>
> catch (e) {
> if (e instanceOf MyError) {
> handleError()
> }
> else {
> throw e;
> }
>
> }
>
> The problem with the JavaScript version is that the re-thrown "e" will
> have a different stack trace than when "e" is caught.
>
> How can I preserve the stack trace so that the re-thrown "e" seems as
> though it was never caught at all?
>
> In the Java world, Hannes Wallnoefer suggested the following works
>
> "The important thing is really to preserve the stack info of the
> original exception, i.e. pass the original exception to the
> RuntimeException constructor."
>
> Various things I've tried in JavaScript running on Rhino has not been
> able to preserve the stack trace. It is fine if a solution only works
> on Rhino. Any suggestions?
>
> Thanks,
> Peter
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