[thelist] CF Arrays vs. List Tip
Joshua Olson
joshua at alphashop.net
Sun Sep 16 18:11:39 CDT 2001
<tip type="ColdFusion" author="Joshua Olson">
ColdFusion Array handling is *much* faster than list functions. If you have
an loop that iterates through a list and uses ListGetAt in every loop, you
may find a significant speed increase by creating an array before the loop
ListToArray and using indexes instead. The longer the lists, the more
profound the disparity becomes.
Example:
Assume you have two long lists of the same length and you want to display
elements from both lists side by side.
slow method
~~~~~~~~~~~~~~~~
<cfloop from="1" to="#ListLen(longList)#" index="i">
<cfset text1 = ListGetAt(long, i)>
<cfset text2 = ListGetAt(complementaryList, i)>
#text1# - #text2#<br>
</cfloop>
faster method
~~~~~~~~~~~~~~~~
<cfset longArray = ListToArray(longList)>
<cfset complementaryArray = ListToArray(complementaryList)>
<cfloop index="i" from="1" to="#ArrayLen(longArray)#">
#longArray[i]# - #complementaryArray[i]#<br>
</cfloop>
</tip>
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