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using instanceof in javascript [message #545369]

Wed, 07 July 2010 14:27

Zohar Amir

Messages: 419
Registered: July 2009

Senior Member

Hello,
I started using eclipse to develop with javascript (actually it's JSFL, but it's close enough). I used exceptions in my code and eclipse flagged my syntax as wrong:

try {
// code here
} catch (e if e instanceof MyException) {
// handle exception
}

I found this syntax in Mozilla's site

What's wrong?

Thanks,
Zohar.

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Re: using instanceof in javascript [message #545536 is a reply to message #545369]

Thu, 08 July 2010 08:12

Nitin Dahyabhai

Messages: 4434
Registered: July 2009

Senior Member

On 7/7/2010 10:27 AM, Zohar Amir wrote:
> Hello,
> I started using eclipse to develop with javascript (actually it's JSFL,
> but it's close enough). I used exceptions in my code and eclipse flagged
> my syntax as wrong:
>
> try {
> // code here
> } catch (e if e instanceof MyException) {
> // handle exception
> }
>
> I found this syntax in
> https://developer.mozilla.org/en/Core_JavaScript_1.5_Referen ce/Statements/try...catch
>
>
> What's wrong?
>
> Thanks,
> Zohar.

How "close enough" is it really? I don't know JSFL, but does it also
document this construct as supported?

--
Nitin Dahyabhai
Eclipse WTP Source Editing and JSDT
IBM Rational

_
Nitin Dahyabhai
Eclipse Web Tools Platform

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Re: using instanceof in javascript [message #545595 is a reply to message #545536]

Thu, 08 July 2010 11:10

Zohar Amir

Messages: 419
Registered: July 2009

Senior Member

Well, this construct works when I run it...
It's just that it's flagged as a syntax error by eclipse.
I'm new to using javascript - isn't this construct something normal?

Thanks,
Zohar

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Re: using instanceof in javascript [message #546999 is a reply to message #545595]

Wed, 14 July 2010 21:52

John J. Barton

Messages: 311
Registered: July 2009

Senior Member

Zohar Amir wrote:
> Well, this construct works when I run it... It's just that it's flagged
> as a syntax error by eclipse.
> I'm new to using javascript - isn't this construct something normal?

Note that the page you cite
https://developer.mozilla.org/en/Core_JavaScript_1.5_Referen ce/Statements/try...catch

says about conditional catch:

Note: This functionality is not part of the ECMAScript specification.

So I guess eclipse does not support it. (I've never seen it used).

jjb

>
> Thanks,
> Zohar

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Re: using instanceof in javascript [message #547518 is a reply to message #546999]

Sun, 18 July 2010 06:37

Zohar Amir

Messages: 419
Registered: July 2009

Senior Member

Hello John,
You're right of course, I just guessed Mozilla is a strong enough player to support this syntax, that they use.

Thank you for looking into this.
Zohar.

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