Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!weretis.net!feeder1.news.weretis.net!news.solani.org!.POSTED!not-for-mail
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Nested try catch
Date: Mon, 21 Jul 2014 03:58:24 +0200
Organization: PointedEars Software (PES)
Lines: 50
Message-ID: <2060326.l3rICqCpkh@PointedEars.de>
References: <7rSdna_x9Z-mw1HOnZ2dnUVZ_vWdnZ2d@westnet.com.au>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8Bit
X-Trace: solani.org 1405907906 5881 eJwFwYEBwCAIA7CXCoU6zxkK/59gkpTprFAqcnL6bN41cqvipjXdbfBBcjLs2j+XUKIbqHkOhhCF (21 Jul 2014 01:58:26 GMT)
X-Complaints-To: abuse@news.solani.org
NNTP-Posting-Date: Mon, 21 Jul 2014 01:58:26 +0000 (UTC)
User-Agent: KNode/4.12.4
X-User-ID: eJwNxMkBwCAIBMCWIByr5Swo/Zdg5jFhqdnwjPSYGHBgOPdb5+5oqbsZOr7Y6fYnEMbmcaKqelhilQoVV6c+cSkWBw==
Face: 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
X-Face: %i>XG-yXR'\"2P/C_aO%~;2o~?g0pPKmbOw^=NT`tprDEf++D.m7"}HW6.#=U:?2GGctkL,f89@H46O$ASoW&?s}.k+&.<b';Md8`dH6iqhT)6C^.Px|[=M@7=Ik[_w<%n1Up"LPQNu2m8|L!/3iby{-]A+#YE}Kl{Cw$\U!kD%K}\2jz"QQP6Uqr],./"?;=4v
Cancel-Lock: sha1:ui2dWvFHWbeMTAqdji72yMUs+jU=
X-NNTP-Posting-Host: eJwNwgERwDAIA0BLSwMB5Aza+pew3b9T0ITJZX5/+WahK+oK0Vqgx5C5R1gmgs/sc7qPIREfAa8QSQ==
Xref: csiph.com comp.lang.javascript:25490

Andrew Poulos wrote:

> If I have this
> 
> try {
>    // blah
> } catch(e) {
>    try {
>      // blah 2
>    } catch(e) {}
> }
> 
> jslint.com says "'e' is already defined" - fair enough. But if I change
> it to
> 
> try {
>    // blah
> } catch(e) {
>    try {
>      // blah 2
>    } catch(e2) {}
> }
> 
> jslint.com says "Expected 'ignore' and instead saw 'e2'".
> 
> Is 'ignore' just a variable name that jslint.com prefers?

Given that jslint.com reports identifiers that are clearly block-scoped per 
Specification as global variables, I would not put too much weight on what 
jslint.com has to say.

This is just one of jslint.com’s many idiosyncrasies imposing Douglas 
Crockford’s defective perception of ECMAScript and its implementations on 
developers: If the “catch” block is empty (not considering comments), he/it 
expects the identifier for the exception value to be “ignore”, and anything 
else is considered an error; otherwise the identifier “ignore” is considered 
an error.

ISTM that jslint.com checks grow more rediculous by the year.  Perhaps 
Douglas Crockford cares to explain what is so bad about block code indented 
with two spaces instead of four?  I would not mind making additional checks 
optional, but to make them the default is highly presumptuous of him.

My advice: Just ignore the new Crockford, his books, and jslint.com.

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
Please do not Cc: me. / Bitte keine Kopien per E-Mail.