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Re: How to perform an EXACT match for an item without looping through?

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Thomas 'PointedEars' Lahn wrote:

> Stefan Ram wrote:
>> justaguy <lichunshen84@gmail.com> writes:
>>>Sorry, it must be a misunderstanding.  For instance,
>>>list.indexOf('12345') produces "found", which is wrong
>>>because it's not the same as '123456', the latter is an item
>>>from the list while the '12345' is not.
>> 
>>   So, maybe, you're looking for
>> 
>> f=(x,y)=>new RegExp(",([^,]*"+y+"[^,]*),").exec(","+x+",")[1];
   ^ ^^^^^^^            ^ ^^^^^  ^            ^^^^^^^^^^^^^^^
 [1] [2]               [3] [6]  [4]           [5][6]

>> f("abcdefghi,jklmnopqrst,uvwxyz","mno")=="jklmnopqrst";
>> 
>>   then?
> 
> Good grief.

To elaborate, this is (from left to right)

  · error-prone[^1]
  · unnecessarily incompatible[^2]
  · unnecessarily unreadable (hard to maintain)[^2][^4]
  · insufficient[^3]
  · unsafe[^4]
  · unnecessarily complicated[^5]
  · unnecessarily inefficient[^6]

IOW: Just. DO. NOT. Do. This.  Ever.

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | <http://PointedEars.de/es-matrix>
<https://github.com/PointedEars> | <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | Please do not cc me./Bitte keine Kopien per E-Mail.

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How to perform an EXACT match for an item without looping through? justaguy <lichunshen84@gmail.com> - 2017-05-02 18:49 -0700
  Re: How to perform an EXACT match for an item without looping through? JJ <jj4public@vfemail.net> - 2017-05-03 18:36 +0700
    Re: How to perform an EXACT match for an item without looping through? justaguy <lichunshen84@gmail.com> - 2017-05-03 05:58 -0700
      Re: How to perform an EXACT match for an item without looping through? JJ <jj4public@vfemail.net> - 2017-05-04 15:03 +0700
        Re: How to perform an EXACT match for an item without looping through? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-05-04 10:57 +0200
        Re: How to perform an EXACT match for an item without looping through? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-05 18:40 +0200
      Re: How to perform an EXACT match for an item without looping through? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-05 19:59 +0200
        Re: How to perform an EXACT match for an item without looping through? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-05-06 02:10 +0200
  Re: How to perform an EXACT match for an item without looping through? John G Harris <niam@jghnorth.org.uk.invalid> - 2017-05-03 14:45 +0100
    Re: How to perform an EXACT match for an item without looping through? justaguy <lichunshen84@gmail.com> - 2017-05-03 07:12 -0700
    Re: How to perform an EXACT match for an item without looping through? justaguy <lichunshen84@gmail.com> - 2017-05-17 09:58 -0700
      Re: How to perform an EXACT match for an item without looping through? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-05-17 19:34 +0200
        Re: How to perform an EXACT match for an item without looping through? justaguy <lichunshen84@gmail.com> - 2017-05-17 11:12 -0700
          Re: How to perform an EXACT match for an item without looping through? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-05-17 20:33 +0200
            Re: How to perform an EXACT match for an item without looping through? justaguy <lichunshen84@gmail.com> - 2017-05-17 15:16 -0700
              Re: How to perform an EXACT match for an item without looping through? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-05-18 11:15 +0200
                Re: How to perform an EXACT match for an item without looping through? justaguy <lichunshen84@gmail.com> - 2017-05-19 07:58 -0700

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