Re: null variable issue???

From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups	comp.lang.javascript
Subject	Re: null variable issue???
Date	2016-05-20 21:06 +0200
Organization	PointedEars Software (PES)
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>

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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
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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

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