arrayReduceRight

This function iterates over every element of the array and calls the closure to work on that element. It will reduce the array to a single value, from the right to the left, and return it.
NOTE:This function is not available in Lucee 5.x or lower. Potentially use reverse() instead.

arrayReduceRight(array, function(result, item [,index, [array]]){} [, initialValue]) → returns any

Member Function Syntax

someArray.reduceRight(function(result, item [,index, [array]]){} [, initialValue])

This function requires Adobe ColdFusion 2021 and up. Not supported on Lucee, etc.

Argument Reference

array array
Required

The input array.

callback any
Required

Closure or a function reference that will be called for each iteration.

Callback parameters:

result* any : The result of the reduce operation after the previous iteration.
item* any : The value for the current iteration's item.
index* numeric : The current index for the iteration
array* array : A reference of the original array

initialValue any

Initial value which will be used for the reduce operation.

Links more information about arrayReduceRight

One last one! CFML higher-order functions compared to tag-based code: reduceRight - Blog entry by Adam Cameron covering the reduceRight function in CFML.

Practical uses for reduce functions - Blog entry by John Whish covering some practical uses for reduce functions in CFML.

Map, Reduce and other Higher Order Functions - A Primer for map, reduce, filter, and Higher Order Functions in general.

ColdFusion 11: .map() and .reduce() - A look at the new .map() and .reduce() methods that each of array, struct and lists all have

Examples

Sample code invoking the arrayReduceRight function

Simple arrayReduceRight Example

Demonstrate how the function works from right to left.

myArray=["a","b","c","d"];
newArray=arrayReduceRight(myArray,function(prev,next,idx,arr){ return prev & next & idx },"");
writedump(newArray);

Expected Result: d4c3b2a1

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arrayReduceRight

Member Function Syntax

Argument Reference

array array Required

callback any Required