ArrayReduce

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Останнє оновлення: 11 січ. 2022 р. | Також застосовується до ColdFusion

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>