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Re: how to remove trailing decimal or decimal 0 of a string?

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In comp.lang.javascript message <1-ydnQHMtu9oVTfNnZ2dnUVZ_hednZ2d@westne
t.com.au>, Tue, 20 Nov 2012 11:03:55, Andrew Poulos
<ap_prog@hotmail.com> posted:

>On 20/11/2012 6:53 AM, Dr J R Stockton wrote:
>> In comp.lang.javascript message <1788183.LAg6v8g3if@PointedEars.de>,
>> Sun, 18 Nov 2012 01:56:31, Thomas 'PointedEars' Lahn
>> <PointedEars@web.de> posted:
>>
>>> Number(myString) will return NaN if there are any non-digits and non-dots in
>>> myString, ignoring leading whitespace.
>>
>> Trebly untrue, even disregarding the omissions of "decimal" and of
>> trailing whitespace.
>
>On IE 9 at least, PE seems to be correct:
>
>var myString = "33a";
>window.alert(Number(myString)); // alerts NaN
>
>myString = "3 3";
>window.alert(Number(myString)); // alerts NaN
>
>myString = "33-";
>window.alert(Number(myString)); // alerts NaN
>
>myString = "  33";
>window.alert(Number(myString)); // alerts 3
>
>myString = "33  ";
>window.alert(Number(myString)); // alerts 3


You are merely proving that some non-digit non-dot characters will
result in NaN, which is not the same thing.  To prove the quoted
assertion, you need to consider all possible non-s in all possible
places.  But to disprove an "any" statement, a single failure suffices.


>
>> And, of course, those of the digits i v I V etc. which are in UniCode
>> 0000-FFFF, and IIRC various even stranger digits, including \u261D.
>
>Aren't those referred to as "Roman numerals"? "Digits" are any of the
>Arabic figures of 1 through 9 and 0.


Read my article again, noticing the word "disregarding".  However, those
characters are in some sense digits, and a precisionist like Lahn (is
anyone like him? I hope not) should have remembered them.

-- 
 (c) John Stockton, nr London, UK.  Mail via homepage.  Turnpike v6.05  MIME.
  Web  <http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms and links;
  Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
 No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News.

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how to remove trailing decimal or decimal 0 of a string? skrite <shawn@skrite.net> - 2012-11-16 09:12 -0800
  Re: how to remove trailing decimal or decimal 0 of a string? Andrew Poulos <ap_prog@hotmail.com> - 2012-11-17 07:10 +1100
    Re: how to remove trailing decimal or decimal 0 of a string? Andrew Poulos <ap_prog@hotmail.com> - 2012-11-17 13:51 +1100
    Re: how to remove trailing decimal or decimal 0 of a string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-17 15:37 +0100
      Re: how to remove trailing decimal or decimal 0 of a string? Andrew Poulos <ap_prog@hotmail.com> - 2012-11-18 08:28 +1100
        Re: how to remove trailing decimal or decimal 0 of a string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-18 01:02 +0100
          Re: how to remove trailing decimal or decimal 0 of a string? Andrew Poulos <ap_prog@hotmail.com> - 2012-11-18 15:40 +1100
  Re: how to remove trailing decimal or decimal 0 of a string? Denis McMahon <denismfmcmahon@gmail.com> - 2012-11-17 08:05 +0000
  Re: how to remove trailing decimal or decimal 0 of a string? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-11-17 09:24 +0100
    Re: how to remove trailing decimal or decimal 0 of a string? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-11-17 09:29 +0100
  Re: how to remove trailing decimal or decimal 0 of a string? Christoph Becker <cmbecker69@gmx.de> - 2012-11-17 12:04 +0100
  Re: how to remove trailing decimal or decimal 0 of a string? BootNic <bootnic.bounce@gmail.com> - 2012-11-17 11:28 -0500
    Re: how to remove trailing decimal or decimal 0 of a string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-18 01:56 +0100
      Re: how to remove trailing decimal or decimal 0 of a string? Dr J R Stockton <reply1247@merlyn.demon.co.uk.invalid> - 2012-11-19 19:53 +0000
        Re: how to remove trailing decimal or decimal 0 of a string? Andrew Poulos <ap_prog@hotmail.com> - 2012-11-20 11:03 +1100
          Re: how to remove trailing decimal or decimal 0 of a string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-20 01:50 +0100
          Re: how to remove trailing decimal or decimal 0 of a string? Dr J R Stockton <reply1247@merlyn.demon.co.uk.invalid> - 2012-11-21 18:44 +0000
            Re: how to remove trailing decimal or decimal 0 of a string? Andrew Poulos <ap_prog@hotmail.com> - 2012-11-22 14:07 +1100
        Re: how to remove trailing decimal or decimal 0 of a string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-20 01:04 +0100
          Re: how to remove trailing decimal or decimal 0 of a string? Dr J R Stockton <reply1247@merlyn.demon.co.uk.invalid> - 2012-11-21 19:00 +0000
      Re: how to remove trailing decimal or decimal 0 of a string? Christoph Becker <cmbecker69@gmx.de> - 2012-11-20 02:10 +0100
        Re: how to remove trailing decimal or decimal 0 of a string? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-20 21:58 +0100
        Re: how to remove trailing decimal or decimal 0 of a string? Dr J R Stockton <reply1247@merlyn.demon.co.uk.invalid> - 2012-11-21 19:09 +0000
  Re: how to remove trailing decimal or decimal 0 of a string? Dr J R Stockton <reply1246@merlyn.demon.co.uk.invalid> - 2012-11-17 21:08 +0000

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