Hi Martin,
On Tue, 20 Jan 2009, Martin wrote:
> I think I found it in my source code. It's a shame.
>
> What I was doing in my callback function (called from rpc.callAsync) was:
>
> for (i=0;i<result.lenght;i++)
>
> and it should have been
>
> for (var i=0;i<result.lenght;i++)
>
> I think I've been rewriting some global variable called "i" (which
> could've been part of some class definition or something).
two comments (unrelated to your error):
- var in JS is working on a function level, NOT on block-level (as e.g. in
Perl). So in case you have a variable i outside the for loop but inside
the same function, you'll still overwriting it, even with var in the for
loop:
function test() {
var i=5;
for (var i=0; i<10; i++) {
}
alert('i='+i);
}
will give i=9
Very ugly indeed.
- Apparently, in JS result.length in your look will be evaluated in every
iteration. Therefore you should move it outside the loop:
var i;
var len=result.length;
for (i=0; i<len; i++) {
}
There also seem to be other (rather unexpected) issues with loop
performance, see e.g.
http://www.webreference.com/programming/optimize/speedup/chap10/3/2.html
Note: I did not benchmark these optimisations myself yet ...
In any case, they probably really matter only for loops with many
iterations (or ones being called frequently).
Cheers,
Fritz
--
Oetiker+Partner AG tel: +41 62 775 99 03 (direct)
Fritz Zaucker +41 62 775 99 00 (switch board)
Aarweg 15 +41 79 675 06 30 (mobile)
CH-4600 Olten fax: +41 62 775 99 05
Schweiz web: www.oetiker.ch
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