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duplicate
Last update:
Jun 9, 2026
Duplicates a Set value using ColdFusion's duplicate() function.
Description
Deep copy semantics for CFML data structures apply where supported.
Returns
A copy of the value.
Category
ColdFusion functions
Function syntax
duplicate(set)Parameters
| Parameter | Description |
|---|---|
| set | Value to duplicate. |
See also
Example
The following example uses this API in
cfscript (syntax: duplicate(set)).
<cfscript>
s = setNew();
s.add("x");
s.add("y");
s2 = duplicate(s);
s2.add("z");
writeOutput(s.size()); // 2
writeOutput(s2.size()); // 3
</cfscript>
Real-world example
Store a snapshot of permissions in session without sharing the same set reference as application scope.
<cfscript>
function snapshotPermissions(required any permSet) {
return duplicate(permSet);
}
live = setNew();
live.add("EDIT");
session.userPermissions = snapshotPermissions(live);
live.add("DELETE");
</cfscript>
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