[Javascript] Try and Catch Question

[Alexander Freiria]

I am a C# .NET developer. I know that there are different types of objects
that are thrown... Given this, it is possible to check the type of object
thrown and react in different ways... For the how that this is done in
Javascript I am not too sure. An example of this would be nice.

On Mon, Mar 2, 2009 at 8:51 AM, MEM <talofo at gmail.com> wrote:

> Ok... we have to have patience with me, sorry, here it goes:
>
> So you are saying that the (e) is there so we can identify what as being
> thrown. Why? Because if we identify what as being thrown we can use that
> identifier somehow, for example,
> If "we want to ignore some errors but we want to respond to others". Is
> this
> assumption correct?
>
> The fact that we cannot have a catch() without something inside is because
> we are not defining WHAT we want to catch, but that supposes that, with a
> catch(), we can catch more than exceptions. Right?
> But is that really important to distinguish what kind of catch are we
> having
> there? I mean, since the procedure is the same for no matter what is catch
> by the catch function, why can't we have a simple catch(), for the cases
> that we don't want to distinguish the exceptions? I'm sure someone have
> thinking this before, and there is a reason why we cannot have catch()
> alone. That's probably the main reason why I can't fully understand, in
> some
> cases, (because the other cases you have already told me) why oh why, we
> need something inside the ().
>
>
> Ps- I've really search on the net for this, but it seems like everybody
> explains how to do the "try catch" thing, but they don't explain properly
> what each part of the "try catch" really means.
>
>
> Thanks a lot once again,
> Márcio
>
>
> -----Original Message-----
> From: javascript-bounces at lists.evolt.org
> [mailto:javascript-bounces at lists.evolt.org] On Behalf Of John Warner
> Sent: segunda-feira, 2 de Março de 2009 12:49
> To: 'JavaScript List'
> Subject: Re: [Javascript] Try and Catch Question
>
> (e) allows your catch block to indentify the exception thrown. In some try
> blocks more than one thing can go wrong, you might choose to ignore some
> errors but want to respond to others.
>
> John Warner
>
>
> > -----Original Message-----
> > From: javascript-bounces at lists.evolt.org [mailto:javascript-
> > bounces at lists.evolt.org] On Behalf Of MEM
> > Sent: Monday, March 02, 2009 7:16 AM
> > To: javascript at lists.evolt.org
> > Subject: [Javascript] Try and Catch Question
> >
> > Hi all, this is my first post, (so if anything is not right in the way I
> > post, please let me know).
> >
> >
> >
> >
> >
> > When we use a try catch statement like this:
> >
> > try {
> >
> >
> >
> > } catch (e) {
> >
> >
> >
> > }
> >
> >
> >
> > Why do we need the ‘e’ ?
> >
> >
> >
> > Well, I have seen also with ‘err’ etc, so I presume the point is to have
> > only something that represents the name error. But, what for? I mean,
> > normally in this kind of statements I never see that ‘e’ or ‘err’ being
> used
> > for nothing, I see no e=”ups error” or something. So, what is that e
> for?
> >
> >
> >
> >
> >
> > Thanks a lot,
> >
> > Márcio
> >
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>
>
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