I have a function that is returning an array that is a local variable inside the component... i beleive an array is considered a complex data type so does this mean its going to pass a referenece rather than a copy?
<cfcomponent>
<cfset variables.anArray = NewArray(1) />
<cffunction name="getList" returntype="array">
<cfreturn variables.anArray />
</cffunction>
</cfcomponent>
Update: Correction: I forgot that arrays are an exception.
http://www.coldfusionjedi.com/index.cfm/2009/5/1/ColdFusion-and-Pass-by-Reference-versus-Value
But confusingly, you can still modify the underlying array under some circumstances. For example:
<!--- this would modify the underlying array --->
<cfset arrayAppend( application.myComponent.getList(), "new value")) >
<cfdump var="#application.myComponent.getList()#" label="getList() contents">
<!--- this WILL NOT change the array inside the component --->
<cfset copyOfArray = application.myComponent.getList() />
<cfset arrayAppend( copyOfArray, "new value")) >
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