On 12/9/05, Scott Hyndman <[EMAIL PROTECTED]> wrote:
> I just did a test. The bitwise approach is not faster...although when you
> think about it, it really should be.
Hi Scott,
the test won't work because (50010001 % 2 == 1) always resolves to
false and the compiler will optimize it (at least MMC, not sure about
MTASC). basically, the same is true for Boolean(50010001 & 1), but
maybe it just optimizes the (50010001 & 1) part because Boolean might
be a custom replacement for the intrinsic class?
mark
> Here is the test code:
>
> // Modulo - Time ~225ms
> var time:Number = getTimer();
> for (var i:Number = 0; i < 80000; i++) {
> var isOdd:Boolean = 50010001 % 2 == 1;
> }
> trace(getTimer() - time);
>
> // Bitwise And - Time: ~356ms
> time = getTimer();
> for (var i:Number = 0; i < 80000; i++) {
> var isOdd:Boolean = Boolean(50010001 & 1);
> }
> trace(getTimer() - time);
>
> I also did a quick test in Java. The bitwise AND approach is about 50%
> faster...really makes you wonder. Maybe AS3 is an improvement.
>
> Scott
>
> -----Original Message-----
> From: [EMAIL PROTECTED] on behalf of Boon Chew
> Sent: Thu 12/8/2005 9:34 PM
> To: Flashcoders mailing list
> Cc:
> Subject: Re: [Flashcoders] Even odds
>
> Yet another way (and probably the fastest):
>
> var isOdd:Boolean = Boolean(num & 1);
>
> - boon
>
> Mike Boutin <[EMAIL PROTECTED]> wrote: Is it possible to check a number to
> see if its even / odd?
>
>
> Thanks!
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