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removeIf
Last update:
Jun 9, 2026
Removes all elements that satisfy a predicate.
Description
Removes all elements that satisfy a predicate (callback). Typically, removeIf passes each element to a function or closure; elements for which the predicate returns true are removed from the set in place.
Returns
Void
Category
ColdFusion Set member methods
Function syntax
set.removeIf(predicate)Parameters
| Parameter | Description |
|---|---|
| predicate | Function or closure; return true to remove the element. |
See also
Example
The following example uses this API in
cfscript (syntax: set.removeIf(predicate)).
<cfscript>
s = setNew();
s.add(1);
s.add(2);
s.add(3);
s.add(4);
// Hypothetical: remove even numbers
s.removeIf( (n) => n mod 2 eq 0 );
</cfscript>
Real-world example
Drop cache keys whose expiry time is in the past (predicate reads a parallel expiry struct).
<cfscript>
/**
* Pseudocode: predicate checks external TTL map.
* Adjust to your engine's closure/lambda syntax.
*/
function removeExpiredKeys(required any keySet, required struct ttlByKey, required date now) {
keySet.removeIf( function(key) {
if (!structKeyExists(ttlByKey, key)) return true;
return ttlByKey[key].lt(now);
});
return keySet;
}
</cfscript>
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