Re: null variable issue???

Path	csiph.com!news.mixmin.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: null variable issue???
Date	Fri, 20 May 2016 21:06:59 +0200
Organization	PointedEars Software (PES)
Lines	29
Message-ID	<1592358.q6somyMhXi@PointedEars.de> (permalink)
References	<d247ae48-6485-40e6-8063-ae3797422142@googlegroups.com> <64f704db-05a1-48a5-b107-6d8425090f0e@googlegroups.com> <oy5fyi8p1oou.n88uyzgd3k3p.dlg@40tude.net>
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 1463771220 22674 eJwNyckBwCAMA7CVCDkZJ+B4/xFafeUaEi8tPMzpzKk21sIZ7IlxXsWf71CEXVepmMzAwn7THzQaEjQ= (20 May 2016 19:07:00 GMT)
X-Complaints-To	abuse@news.solani.org
NNTP-Posting-Date	Fri, 20 May 2016 19:07:00 +0000 (UTC)
User-Agent	KNode/4.14.2
X-User-ID	eJwNy8kBwCAMA7CVcMFOM06aY/8Ryl/iFpR2RB0OBw5hyafSFDbqz9Ld5L3eOl1XV3jupHUEb0MR8wxD4P4BUaQVew==
Cancel-Lock	sha1:72ABF4GSeYibUV9IgM9CUDbtjVI=
X-NNTP-Posting-Host	eJwNyMkBwCAIBMCWRNiVlIMc/Zdg5jlQCvMYQcNgdsWO9jWypEIbm1ldbrxU99Ls/w4Bnfz0PihJEWE=
Xref	csiph.com comp.lang.javascript:30502

Show key headers only | View raw

JJ wrote:

> On Fri, 20 May 2016 06:29:57 -0700 (PDT), helixpoint@gmail.com wrote:
>> On Friday, May 20, 2016 at 7:45:35 AM UTC-4, helix...@gmail.com wrote:
>>> This is the line. Can't I use...&& to stop this from returning null
>>> 
>>> return (E.Util.ieVersion() < 9 ? a.caller : a.caller.caller);
>>> 
>>> I know this is wrong, but something like....
>>> 
>>> return (E.Util.ieVersion() < 9 ? &&a.caller : &&a.caller.caller);
>> 
>> If both object are null in the ternary, I get an error because it is
>> looking for a true or false returned. If it is null, I need to return
>> true
> 
> Use this then.
> 
>   return (E.Util.ieVersion() < 9 ? a.caller : a.caller.caller) || true;

It is a mistake to depend on browser sniffing when there are more reliable 
alternatives.  The OP is probably having an X–Y problem, attempting to fix
with this a problem that occurred only because of a wrong approach.

-- 
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.

Thread

null variable issue??? helixpoint@gmail.com - 2016-05-20 04:45 -0700
  Re: null variable issue??? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-05-20 05:21 -0700
  Re: null variable issue??? helixpoint@gmail.com - 2016-05-20 05:42 -0700
    Re: null variable issue??? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-05-20 06:05 -0700
    Re: null variable issue??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-05-20 14:10 +0100
  Re: null variable issue??? helixpoint@gmail.com - 2016-05-20 06:29 -0700
    Re: null variable issue??? JJ <jj4public@vfemail.net> - 2016-05-20 20:53 +0700
    Re: null variable issue??? JJ <jj4public@vfemail.net> - 2016-05-20 20:55 +0700
      Re: null variable issue??? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-05-20 21:06 +0200
        arguments object in strict mode (was: null variable issue???) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-05-22 07:23 +0200
  Re: null variable issue??? JJ <jj4public@vfemail.net> - 2016-05-20 20:46 +0700

csiph-web