console.log("raw time", +new Date - start);
+new Date --> Yeah!
>
> start = +new Date;
> for (var i = 0; i < 1000; i++) {
> var tainted = Object.tainted();
> for (var key in test) {
> if (!tainted || !Object.prototype[key]) {
> fn(key, test[key]);
> }
> }
> }
> console.log("checked time", +new Date - start);
>
> The second version seems be about 15 to 20 % slower, but thats for a
> million iterations... There difference is much smaller for this
> version:
>
20% seems like a relevant percent to me. This is most called method.
Note that having firebug on, messes up numbers. Specially for function calls
(Object.tainted).
I'd try that w/o firebug.
As a small improvement:
var clean = !Object.tainted();
Saves you one boolean cast for each iteration.
> I've modified $.each to include the Object.prototype check and ran it
> against ?core&selector, couldn't see any performance difference, if
> anything, it seemed to be faster. Not a good benchmark either, but
> from what I see, just doing the Object.prototype check, maybe caching
> the Object.prototype lookup in a local var, is safe and irrelevant for
> performance.
>
Did you tried that (caching in a var) with a benchmarker ?
--
Ariel Flesler
http://flesler.blogspot.com
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