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ArrayReduce
Last update:
May 18, 2026
Description
Iterates over every entry of the array and calls the closure to work on the elements of the array. This function will reduce the array to a single value and will return the value.
Returns
Any
Syntax
ArrayReduce(array, callback,[ initialValue=null]) |
History
ColdFusion (2018 release): Changed parameter function to callback.
ColdFusion 11: Added this function.
Parameters
Parameter | Req/Opt | Default | Description |
| array | Required | The input array. | |
| callback | Required | Closure or a function reference that will be called for each of the iteration . The arguments passed to the callback are
| |
| initialValue | Optional | Initial value which will be used for the reduce operation. The type is any. |
Example
<cfscript>
arr = [1,2,3,4,5];
function square(element, index)
{
writeOutput("index is " & index);
return element * element;
}
sq = arrayMap(arr, square);
writeDump(sq);
result = arrayReduce(sq, function(value, element)
{
value = value?:0;
value += element;
return value;
});
writeDump(result);
</cfscript>
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