[Javascript] How quick is quick ?

[liorean]

On Tue, 9 Nov 2004 16:36:11 -0000, Tim Makins <spindrift at oceanfree.net> wrote:
> A few comments recently about how this will take time, and how that will be really slow.
> It would be nice to know exactly - has anyone got a routine that monitors the time a javascript routine takes to operate ??

    /* make sure everything that is needed for the test is done here,
before the first date. Examples are variable instantiation and static
parts such as caching values.*/
    var
        d=new Date;
    /* dotest*/;
    d-=new Date; // Stores the time difference directly after doing
the test. Note that this will be a negative value.

A typical example of this technique is the following benchmark:
    var
        i=5e5,
        d=new Date;
    do
        /*whatever*/;
    while(0<--i);
    d-=new Date;
    alert('Run time, 500 000 cycles: '+(-d));
-- 
David "liorean" Andersson
<uri:http://liorean.web-graphics.com/>