When putting together some code for the post I made a few minutes ago I
ran into trouble manipulating arrays with a cffunction. It appears that
arrays are being passed by value. Specifically, I originally wrote the
example with this code:
<cfset sortIdArray(rootArray)>
<cffunction name="sortIdArray" returnType="void">
<cfargument name="arrayToSort" type="Array" required="true">
<cfset var i=0>
<cfset var j=0>
<cfset var a = arguments.arrayToSort>
<cfset var al = arrayLen(a)>
<cfset var t="">
<cfloop index="i" from="1" to="#al-1#">
<cfloop index="j" from="#i+1#" to="#al#">
<cfif recStruct[a[i]] GT recStruct[a[j]]>
<cfset t = a[i]>
<cfset a[i] = a[j]>
<cfset a[j] = t>
</cfif>
</cfloop>
</cfloop>
</cffunction>
But it didn't work. The sortIdArray ran, it seemed to do the proper
sorting, but later uses of the array were not sorted. So, I changed it
to this:
<cfset rootArray = sortIdArray(rootArray)>
<cffunction name="sortIdArray" returnType="Array">
<cfargument name="arrayToSort" type="Array" required="true">
<cfset var i=0>
<cfset var j=0>
<cfset var a = arguments.arrayToSort>
<cfset var al = arrayLen(a)>
<cfset var t="">
<cfloop index="i" from="1" to="#al-1#">
<cfloop index="j" from="#i+1#" to="#al#">
<cfif recStruct[a[i]] GT recStruct[a[j]]>
<cfset t = a[i]>
<cfset a[i] = a[j]>
<cfset a[j] = t>
</cfif>
</cfloop>
</cfloop>
<cfreturn a>
</cffunction>
and it worked fine. Changes were in first cfset, returnType, and added
cfreturn.
This seems to indicate Arrays are passed by value. I didn't check if
it's a deep copy (duplicate) or if it's just a first level copy. Is
this expected/correct behavior?
Sam
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