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ArrayReduce

Last updated on May 30, 2024 | Also applies to ColdFusion

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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	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 result: result of the reduce operation after the previous iteration item: item in the array index : current index for the iteration array : reference of the original array
initialValue	Optional	Initial value which will be used for the reduce operation. The type is any.

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

result: result of the reduce operation after the previous iteration
item: item in the array
index : current index for the iteration
array : reference of the original array

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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