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Re: FAQ Topic - How do I format a Number as a String with exactly 2 decimal places? (2013-03-15)

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Dr J R Stockton wrote on 16 mrt 2013 in comp.lang.javascript:

> In comp.lang.javascript message <XnsA18460B31AE76eejj99@194.109.133.133>
> , Fri, 15 Mar 2013 09:30:21, Evertjan. <exxjxw.hannivoort@inter.nl.net>
> posted:
> 
>>FAQ server wrote on 15 mrt 2013 in comp.lang.javascript:
>>
>>> 
-----------------------------------------------------------------------
>>> FAQ Topic - How do I format a Number as a String with
>>> exactly 2 decimal places?
>>> 
-----------------------------------------------------------------------
>>>
>>> When formatting money for example, to format 6.57634 to 6.58, 6.7 to
>>> 6.50, and 6 to 6.00?
>>
>>[Negative values should be included in this specification]
>>
>>function formatNumber2(n) {
>>   sign = (n<0) ?'-' :'';
>>   n = Math.abs(n * 100 + .5);

The above line should be:

   n = Math.abs(n) * 100 + .5;

>>   n = Math.floor(n).toString();
>>   while (n.length<3) n = '0' + n;
>>   n = n.replace(/(\d{2})$/,'.$1');
>>   return sign + n;
>>};
>>
>>//====== test: =======
>>
>>var n = -.0657634;
>>document.write(formatNumber2(n) + '<br>');
>>
>>var n = .999999;
>>document.write(formatNumber2(n) + '<br>');
>>
>>var n = -12.01999;
>>document.write(formatNumber2(n) + '<br>');
>>
>>var n = -0;
>>document.write(formatNumber2(n) + '<br>');
> 
> I expect that you did not test it with n = -33, or n = null.  The one in
> the FAQ is better; it does -33 correctly.  I used current Windows XP
> Firefox.

No reason why it should work with null. 
Should it work for n = 'blah';,
or for n being an object?

-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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FAQ Topic - How do I format a Number as a String with exactly 2 decimal places? (2013-03-15) "FAQ server" <javascript@dotinternet.be> - 2013-03-15 00:00 +0000
  Re: FAQ Topic - How do I format a Number as a String with exactly 2 decimal places? (2013-03-15) "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-03-15 09:30 +0100
    Re: FAQ Topic - How do I format a Number as a String with exactly 2 decimal places? (2013-03-15) Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-03-16 19:57 +0000
      Re: FAQ Topic - How do I format a Number as a String with exactly 2 decimal places? (2013-03-15) "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-03-17 19:36 +0100
        Re: FAQ Topic - How do I format a Number as a String with exactly 2 decimal places? (2013-03-15) Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-03-18 19:21 +0000
          Re: FAQ Topic - How do I format a Number as a String with exactly 2 decimal places? (2013-03-15) "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-03-19 08:43 +0100

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