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: How to have multiple and undetermined number of arguments for function?
Date: Mon, 10 Oct 2016 18:22:29 +0100
Organization: PointedEars Software (PES)
Lines: 44
Message-ID: <9018847.nUPlyArG6x@PointedEars.de>
References: <c8d1b70e-031e-4b10-a454-afee5d0c9590@googlegroups.com> <l4lkvb5qrrojvvt7h9f34g2b3rhp81pcki@4ax.com> <9abdc041-3977-470c-a886-b6ae885818c8@googlegroups.com> <87oa2ttk3f.fsf@bsb.me.uk> <441c0eb7-210d-4310-b58c-216a6a157dae@googlegroups.com> <XnsA69CEE721F5C2eejj99@194.109.6.166> <7112eabe-6254-4ac4-b2f2-ff9d3d6cff5e@googlegroups.com> <f50fbc4b-55b1-4e66-8745-e20fba0b54d8@googlegroups.com> <ntgbvb$5e0$1@dont-email.me> <718ec6b6-a194-48b3-87b9-3330b2f485d1@googlegroups.com> <ntgh20$p79$1@dont-email.me>
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 1476120150 15391 eJwFwYEBwDAEBMCVKrwwDnn2H6F3UBd/1xxuWCwrnXpCjFmturKNIfLSQjFRXZ00tzeH/H4o2BHJ (10 Oct 2016 17:22:30 GMT)
X-Complaints-To: abuse@news.solani.org
NNTP-Posting-Date: Mon, 10 Oct 2016 17:22:30 +0000 (UTC)
User-Agent: KNode/4.14.2
X-User-ID: eJwNyskBwDAIA7CVSs1hxiEE9h+h1VsGF+9QN1dbW6ldisS9hkFRybeD8CcTO5grYdLJ88CPVv6hsyQOdzTnA0Q4FSk=
X-NNTP-Posting-Host: eJwFwYERAEEEBLCWGCxfDuv0X8InYVAwHQGPizv5THtPQGhdbnhzBbUzZXjkdNHo+fps/Qcs1hIf
Cancel-Lock: sha1:16CD6c8hpRMox4yKE981pxEPi8k=
Xref: csiph.com comp.lang.javascript:31555

Jake Jarvis wrote:

> Am 10.10.2016 um 17:50 schrieb justaguy:
>> […]
>> I see.  Thought, indexOf is sort of "contains".  In the meantime, I have
>> another statement, if (arguments[counter][0].indexOf('_row2')) {
>> // do this an that
>> }
>> and it found it.  How come?
> 
> You need to look a bit closer, something is being done to the result of
> indexOf.
> The ! operator is applied to it.
> 
> indexOf just returns -1 or position inside the string
> 
> For what numbers that indexOf might return does ! give a true?
> For a 0

(I stand) correct(ed).  But now they have omitted the “!” operator, 
reversing the condition, so the block will be executed whenever the element 
either does not contain or does not start with "_row2".

IOW, the proper way to do this is

  if (arguments[counter][0].indexOf("_row2") > -1)
  {
    /* do things if first element contains "_row2" */
  }

or

  if (arguments[counter][0].indexOf("_row2") >= 0)
  {
    /* do things if first element contains "_row2" */
  }

if arguments[counter] is a reference to an array-like object.

-- 
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.