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Re: Modify Element Tag Question

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In comp.lang.javascript message <XnsA0596AFCC343Eeejj99@194.109.133.133>
, Sun, 20 May 2012 08:31:04, Evertjan. <exjxw.hannivoort@interxnl.net>
posted:

>Dr J R Stockton wrote on 19 mei 2012 in comp.lang.javascript:
>
>> In comp.lang.javascript message
>> <60e864d1-ef34-4b1d-924e-5a8ec62c849a@3g 2000vbx.googlegroups.com>,
>> Thu, 17 May 2012 18:48:05, Scott Sauyet <scott.sauyet@gmail.com>
>> posted:
>>
>>>The page Mel supplied included a fair bit of sensitive customer data,
>>>which, I assume is why he hasn't posted simpler versions anywhere.
>>>But there is nothing sensitive about the sorting routines, and they
>>>are simple and appropriate:
>>>
>>>    function cmpNameAsc(x, y) {
>>>      if (x.mem === y.mem) return 0;
>>>      return (x.mem > y.mem) ? 1 : -1;
>>>    }
>
>No reason for prohibiting typeconversion with ===,
>or is this a speed issue?
>
>if the === false and the == is true,
>you would end up with returning -1,
>not so useful.

In using a sort routine for a comparison function, it seems to me rather
probable that the two arguments will be of the same type.  One could of
course construct an artificial counter-example.


>> I think, supported by very brief testing, that it would be better to
>> do
>>a > test and return +1, else do a < test and return -1; else return 0.
>> That is on the assumption that equality is rare.
>>
>> The code shown will almost half of the time do one comparison, whereas
>> comparing first with 0 will almost always do two comparisons.
>>
>> The difference made to the overall time will be small but possibly
>> measurable; and it may be browser-dependent.
>
>
>function cmpNameAsc(x, y) {
>     return (x.mem > y.mem) ? 1 : (x.mem < y.mem) -1 : 0;
>};
>
>This way it looks nicer to me,
>would it be even faster?

No.  At least, not in FF12, in a crude test.  But the OP should try that
properly.

-- 
 (c) John Stockton, nr London, UK.    ?@merlyn.demon.co.uk     Turnpike v6.05.
 Website  <http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms
 PAS EXE etc. : <http://www.merlyn.demon.co.uk/programs/> - see in 00index.htm
 Dates - miscdate.htm estrdate.htm js-dates.htm pas-time.htm critdate.htm etc.

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Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-11 13:42 -0600
  Re: Modify Element Tag Question Martin Honnen <mahotrash@yahoo.de> - 2012-05-12 12:00 +0200
    Re: Modify Element Tag Question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-05-12 15:02 +0200
      Re: Modify Element Tag Question John G Harris <john@nospam.demon.co.uk> - 2012-05-12 16:15 +0100
        Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-12 14:32 -0600
  Re: Modify Element Tag Question Dr J R Stockton <reply1219@merlyn.demon.co.uk.not.invalid> - 2012-05-12 19:29 +0100
    Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-12 18:08 -0600
      Re: Modify Element Tag Question "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-05-13 08:11 +0000
    Re: Modify Element Tag Question Martin Honnen <mahotrash@yahoo.de> - 2012-05-13 11:25 +0200
      Re: Modify Element Tag Question Dr J R Stockton <reply1220@merlyn.demon.co.uk.not.invalid> - 2012-05-14 20:19 +0100
  Re: Modify Element Tag Question Denis McMahon <denismfmcmahon@gmail.com> - 2012-05-13 02:59 +0000
    Re: Modify Element Tag Question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-05-13 15:50 +0200
      Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-13 08:56 -0600
      Re: Modify Element Tag Question Dr J R Stockton <reply1219@merlyn.demon.co.uk.not.invalid> - 2012-05-14 20:01 +0100
    Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-13 09:00 -0600
      Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-14 08:45 -0600
        Re: Modify Element Tag Question Scott Sauyet <scott.sauyet@gmail.com> - 2012-05-14 16:31 -0700
          Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-15 09:03 -0600
        Re: Modify Element Tag Question Dr J R Stockton <reply1220@merlyn.demon.co.uk.not.invalid> - 2012-05-15 20:04 +0100
          Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-15 22:19 -0600
            Re: Modify Element Tag Question Dr J R Stockton <reply1220@merlyn.demon.co.uk.not.invalid> - 2012-05-17 19:13 +0100
              Re: Modify Element Tag Question Scott Sauyet <scott.sauyet@gmail.com> - 2012-05-17 18:48 -0700
                Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-18 13:14 -0600
                Re: Modify Element Tag Question Dr J R Stockton <reply1220@merlyn.demon.co.uk.not.invalid> - 2012-05-19 20:47 +0100
                Re: Modify Element Tag Question "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-05-20 08:31 +0000
                Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-20 18:25 -0600
                Re: Modify Element Tag Question "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-05-21 16:06 +0000
                Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-21 13:24 -0600
                Re: Modify Element Tag Question "Mel Smith" <med_cutout_syntel@aol.com> - 2012-05-21 13:34 -0600
                Re: Modify Element Tag Question Scott Sauyet <scott.sauyet@gmail.com> - 2012-05-21 13:09 -0700
                Re: Modify Element Tag Question Dr J R Stockton <reply1221@merlyn.demon.co.uk.not.invalid> - 2012-05-21 20:33 +0100

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