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Groups > comp.lang.javascript > #7847

Re: meaning of (toto)? true : false

Message-ID <2198638.IIGME3H9Hf@PointedEars.de> (permalink)
From Thomas 'PointedEars' Lahn <PointedEars@web.de>
Organization PointedEars Software (PES)
Date 2011-10-30 22:00 +0100
Subject Re: meaning of (toto)? true : false
Newsgroups comp.lang.javascript
References <4eab9340$0$27929$426a34cc@news.free.fr> <a6dra7132v6ul7qp4lbsaofmek24geomnv@4ax.com> <j8kdke$uqs$1@news.albasani.net>
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Andreas Bergmaier wrote:

> Hans-Georg Michna schrieb:
>> ? true : false
>> is another way to write,
>> "I don't understand JavaScript."
>>
>> If you really have to transform something into a boolean that
>> isn't already one, just write !! in front of it, but think again
                           ^^^^^^^^^^^^^^^^^^^^^^^
>> whether that is really needed.
> 
> I'm sure in his application he uses other values like strings. This
> console.log-thing was just to show his problem. Of course he could have
> written:
>   console.log("Why is this "+foo ? "true" : "false" + "?")

You appear to have missed the point:

  console.log("Why is this " + !!foo + "?");

> but does it matter?

If it leads to inefficient, error-prone code, then yes.


PointedEars
-- 
    realism:    HTML 4.01 Strict
    evangelism: XHTML 1.0 Strict
    madness:    XHTML 1.1 as application/xhtml+xml
                                                    -- Bjoern Hoehrmann

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Thread

meaning of (toto)? true : false Une Bévue <unbewusst.sein@fai.invalid> - 2011-10-29 07:46 +0200
  Re: meaning of (toto)? true : false Une Bévue <unbewusst.sein@fai.invalid> - 2011-10-29 07:53 +0200
  Re: meaning of (toto)? true : false "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2011-10-29 14:47 -0700
    Re: meaning of (toto)? true : false Une Bévue <unbewusst.sein@fai.invalid> - 2011-10-30 05:37 +0100
  Re: meaning of (toto)? true : false Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2011-10-30 21:38 +0100
    Re: meaning of (toto)? true : false Andreas Bergmaier <andber93@web.de> - 2011-10-30 21:55 +0100
      Re: meaning of (toto)? true : false Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-10-30 22:00 +0100
    Re: meaning of (toto)? true : false Dr J R Stockton <reply1144@merlyn.demon.co.uk> - 2011-10-31 18:06 +0000

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