Trim functions

[RobG]

There is an interseting examination of varions trim functions here:

<URL: http://blog.stevenlevithan.com/archi...rim-javascript >

The best all-round function seems to be trim3 when strings have lots
of leading and trailing whitespace, which is when other functions slow
down and speed is of most importance.


--
Rob

[Evertjan.]

Re: Trim functions

RobG wrote on 03 jun 2008 in comp.lang.javas cript:

There is an interseting examination of varions trim functions here:
>
<URL: http://blog.stevenlevithan.com/archi...rim-javascript >
>
The best all-round function seems to be trim3 when strings have lots
of leading and trailing whitespace, which is when other functions slow
down and speed is of most importance.
>

Interesting!

While his trim12 is very good at longer strings,
these do better at short ones:

function myTrim1 (str) {
var str = str.replace(/^\s\s*/, '');
str = str.replace(/\s\s*$/, '');
};

function trim1 (str) {
var str = str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
};

His trim1 taking nearly TWICE the time myTrim1 takes in IE7 and FF2
independent of string length!

Why would that be?


=============== =======

btw: Leaving of the ;;; does gain round 10%.

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

[Evertjan.]

Re: Trim functions

Evertjan. wrote on 03 jun 2008 in comp.lang.javas cript:

function myTrim1 (str) {
var str = str.replace(/^\s\s*/, '');
str = str.replace(/\s\s*$/, '');
>};
>
function trim1 (str) {
var str = str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
>};
>
His trim1 taking nearly TWICE the time myTrim1 takes in IE7 and FF2
>

Forget that, I mixed them up, it is the other, more logical, way around.

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