Is it even possible in any other circumstance to create such a structure/array with undefined elements? I had assumed no, and coded many a function with that assumption.
Yup. Very easy. Call any Java method in a way that returns a null pointer and assign it to a struct element or array element - CF will treat it as an undefined value.
// NullValue.java:
public class NullValue {
public Object getNull() { return null; }
}<!--- UseNull.cfm: --->
<cfset nullvalue = createObject("java","NullValue") />
<cfset arr = arrayNew(1) />
<cfset arr[1] = "one" />
<cfset arr[2] = "two" />
<cfset arr[3] = "three" />
<cfset arr[2] = nullvalue.getNull() />
<cfif not isDefined("arr[2]")>
arr[2] is not defined!
</cfif>
<cfset str = structNew() />
<cfset str.one = 1 />
<cfset str.two = 2 />
<cfset str.three = 3 />
<cfset str.two = nullvalue.getNull() />
<cfif not isDefined("str.two")>
str.two is not defined!
</cfif>(untested code but I think it'll show what I mean)
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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