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isDisjointFrom
Last update:
May 18, 2026
Returns true if the two sets have no elements in common.
Description
Returns a new set containing elements that are in either this set or the other set, but not in both (exclusive OR of membership: (A ∪ B) \ (A ∩ B)).
Returns
Boolean.
Category
ColdFusion Set member methods
Function syntax
set.isDisjointFrom(otherSet)Parameters
| Parameter | Description |
|---|---|
| otherSet | Another Set. |
See also
Example
The following example uses this API in
cfscript (syntax: set.isDisjointFrom(otherSet)).
<cfscript>
setA = setNew();
setA.add(1);
setA.add(2);
setA.add(3);
setB = setNew();
setB.add(2);
setB.add(3);
setB.add(4);
symmetricSet = setA.symmetricDifference(setB);
// 1 and 4 are only on one side; 2 and 3 are in both → excluded
writeOutput(symmetricSet.size()); // 2
</cfscript>
Real-world example
Ensure two product bundles in a cart are mutually exclusive (no shared SKUs).
<cfscript>
/**
* Symmetric difference highlights IDs that appear in only one snapshot
* (new or removed compared to pairwise “in both” sets).
*/
yesterday = setNew();
yesterday.add("user1");
yesterday.add("user2");
today = setNew();
today.add("user2");
today.add("user3");
changed = yesterday.symmetricDifference(today);
// user1 only yesterday, user3 only today
writeOutput(changed.size()); // 2
</cfscript>
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