On Wednesday, July 31, 2002, at 10:23 , Brook Davies wrote:
> How does this work? Instead of using evaluate? Is this faster? I have a
> lot
> of evaluate statements in my code and Ramond Chan's words haunt me ;)
Show us some of your code that uses evaluate() and we'll see if we can
show you a simpler and/or faster way to write it.
> And, another question. If I have a big long fat list, is it faster to
> convert it to an array and loop over the array than it is to just loop
> over
> the list or use the listgetat() command?
I would *expect* it to be faster to convert the list once and then loop
over it. Hmm, I feel a performance test coming on...
Big difference in speed!!! 20x
1000 iterations:
listGetAt took 13589 ms
array took 724 ms
Here's the test:
<cfparam name="URL.loop" type="numeric" default="1"/>
<cfscript>
loop = URL.loop;
listOfStuff = "000";
for ( i = 1; i le 100; i = i + 1 )
listOfStuff = listOfStuff & "," & i & i & i;
s1 = getTickCount();
for ( q = 1; q le loop; q = q + 1 ) {
len = listLen(listOfStuff);
for ( i = 1; i le len; i = i + 1 )
x = listGetAt(listOfStuff,i);
}
e1 = getTickCount();
s2 = getTickCount();
for ( q = 1; q le loop; q = q + 1 ) {
arrayOfStuff = listToArray(listOfStuff);
len = arrayLen(arrayOfStuff);
for ( i = 1; i le len; i = i + 1 )
x = arrayOfStuff[i];
}
e2 = getTickCount();
</cfscript>
<cfoutput>
#loop# iterations:<br/>
listGetAt took #e1 - s1# ms<br/>
array took #e2 - s2# ms<br/>
</cfoutput>
Sean A Corfield -- http://www.corfield.org/blog/
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
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