FAQ Topic - How do I convert a Number into a String with exactly 2 decimal places? (2007-12-15) - Javascript

In comp.lang.javascript message <47631908$0$90270$14726298@news.sunsite.
dk>, Sat, 15 Dec 2007 00:00:01, FAQ server <javascript@dotinternet.be>
posted:
>
> function Stretch(Q, L, c) { var S = Q
> if (c.length>0) while (S.length<L) { S = c+S }
^^^^^^^^^^^^^^^ That seems unnecessary in this context. Indeed, the
loop could be incorporated in StrU.

> return S
> }
> function StrU(X, M, N) { // X>=0.0
> var T, S=new String(Math.round(X*Number("1e"+N)))
^^^^^^^^^^^^^^ Math.pow is better
> if (S.search && S.search(/\D/)!=-1) { return ''+X }
No need to .search; /\D/.test(St) is simpler
It would be better to left-pad that return value to width M+N+1

> with (new String(Stretch(S, M+N, '0')))
^^^^ ISTR an expressed dislike of using with.
^^^ ^^^^^^ there should be no need for a new string.

> return substring(0, T=(length-N)) + '.' + substring(T)
> }


> Number.prototype.toFixed= function(n){ return StrS(this,1,n)};
Tatty spacing.

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 MIME.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/&c., FAQqy topics & links;
<URL:http://www.merlyn.demon.co.uk/clpb-faq.txt> RAH Prins : c.l.p.b mFAQ;
<URL:ftp://garbo.uwasa.fi/pc/link/tsfaqp.zip> Timo Salmi's Turbo Pascal FAQ.

Dr J R Stockton wrote:

[...]

>> Number.prototype.toFixed= function(n){ return StrS(this,1,n)};
>
> Tatty spacing.

Maybe this is an occasion on how whitespace (and by extension) line-
end are handled in the daily FAQ-postings.

The nature of the application requires to start from
http://www.jibbering.com/faq/index.xml with all whitespaces and line-
ends as written in the source code.

This is not like browser displays where whitespace and EOL are treated
differently.

I had invented the following regular expressions in order to obtain a
(IMO) best possible Usenet-display:

"p" => "\n",
"/p" => "\n",
"em" => "_",
"/em" => "_",
"url" => "\n\n",
"/url" => "\n\n",
"ul" => "\n",
"/ul" => "\n",
"li" => "* ",
"/li" => "",
"moreinfo" => "\n\n",
"/moreinfo" => "\n\n",
"resource" => "\n\n",
"/resource" => "\n\n",
"icode" => "` ",
"/icode" => " `",
"code" => "\n\n",
"/code" => "\n\n",

Additional rules:
- If more than three successive end-of-lines characters occur, they
are replaced by two.
- Six trailing spaces are removed.
- End-of-lines at the beginning an end of every message are removed.

Sometimes this may lead to less-than-optimal results, but I'm afraid
there is no other possibility because the application needs some rules
anyway how it should display the input stream.

Quick link to the results:
http://groups.google.com/groups/sear...t.be&scoring=d

For all clarity, this does not apply to the code line that you
mentioned as this is literally the same as the source.

--
Bart

Bart Van der Donck wrote:

> Additional rules:
> - If more than three successive end-of-lines characters occur, they
> are replaced by two.
> - Six trailing spaces are removed.

I meant leading spaces.

--
Bart