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isSubsetOf
Last update:
Jun 9, 2026
Returns true if every element of this set is in the other set.
Description
Returns true if every element of this set is also contained in the other set (this set is a subset of `other`: (A is a subset of B). For the empty set, subset semantics typically follow mathematical convention (empty set is subset of any set).
Returns
Boolean.
Category
ColdFusion Set member methods
Function syntax
set.isSubsetOf(otherSet)Parameters
| Parameter | Description |
|---|---|
| otherSet | Potential superset. |
See also
Example
The following example uses this API in
cfscript (syntax: set.isSubsetOf(otherSet)).
<cfscript>
setA = setNew();
setA.add(2);
setA.add(3);
setB = setNew();
setB.add(1);
setB.add(2);
setB.add(3);
setB.add(4);
writeOutput(setA.isSubsetOf(setB)); // true
writeOutput(setB.isSubsetOf(setA)); // false
</cfscript>
Real-world example
Verify a request only asks for columns that exist on the table (required ⊆ allowed).
<cfscript>
function hasAllRequiredSkills(required any required, required any candidate) {
return required.isSubsetOf(candidate);
}
required = setNew();
required.add("A");
required.add("B");
candidate = setNew();
candidate.add("A");
candidate.add("B");
candidate.add("C");
writeOutput(hasAllRequiredSkills(required, candidate)); // true
</cfscript>
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