Re: FAQ Topic - How do I trim whitespace - LTRIM/RTRIM/TRIM?

In comp.lang.javascript message <1193957400.023804.169070@xxxxxxxxxxxxxx
oglegroups.com>, Thu, 1 Nov 2007 22:50:00, Peter Michaux
<petermichaux@xxxxxxxxx> posted:

function lTrim(str) {
for (var k=0; k<str.length && str.charAt(k)<=" "; k++) ;
return str.substring(k, str.length);
}
function rTrim(str) {
for (var j=str.length-1; j>=0 && str.charAt(j)<=" "; j--) ;
return str.substring(0, j+1);
}

It is often considered good practice for the terminal condition of a FOR
loop to be constant during that loop, to reduce confusion. Therefore
(undertested) :-

function lTrim(str) { var k = 0
while( k<str.length && str.charAt(k)<=" ") k++
return str.substring(k, str.length);
}

function rTrim(str) { var k = str.length-1
while (k>=0 && str.charAt(k)<=" ") k--
return str.substring(0, k+1);
}

Functions, except maybe when one-liners, should be separated by vertical
whitespace, for legibility. And k is better than j.

The character l should not be used where it might be, even momentarily,
thought to be a 1. Therefore, the names might be changed to trimL and
for symmetry trimR, matching trim in case. To facilitate searching for
the identifier, I suggest trim be renamed to trimX (X for eXtremes).

And "ASCII<32" is wrong, since the characters are UniCode.

--
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