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listReduceRight

This function iterates over every element of the list and calls the closure to work on that element. This function will reduce the list to a single value, from the right to the left, and will return the value. NOTE: Use caution if using the member function. list.reduceRight and list.listReduceRight may behave differently. NOTE:This function is not available in Lucee 5.x or lower. Potentially use reverse() instead.

listReduceRight(list, callback, initialValue[, delimiter][, includeEmptyFields])

returns any

Member Function Syntax

list.listReduceRight(callback, initialValue[, delimiter][, includeEmptyFields])

Argument Reference

Name	Type	Required	Default	Description
list	string	Yes		The input list.
callback	any	Yes		Closure or a function reference that will be called for each iteration.
initialValue	any	Yes		Initial value which will be used for the reduce operation.
delimiter	string	No	,	The list delimiter
includeEmptyFields	boolean	No	false	Include empty values?

callback ( callback arguments )

| Name | Type | Required | Description | | — | — | — | — | | result | any | No | The result of the reduce operation after the previous iteration. | item | any | No | The value for the current iteration’s item. | index | numeric | No | The current index for the iteration. | list | string | No | A reference of the original list.

Simple listReduceRight Example

Demonstrate how the function works from right to left.

myList="a,b,c,d";
newList=listReduceRight(myList,function(prev,next,idx,arr){ return prev & next & idx },"");
writedump(newList);

Expected Result: d4c3b2a1

listReduceRight as a Member Function

Demonstrate the member function.

myList="a,b,c,d";
newList=myList.listReduceRight(function(prev,next,idx,arr){ return prev & next & idx },"");
writedump(newList);

Expected Result: d4c3b2a1

Empty Elements

Demonstrate the behavior when there is an empty element.

myList="a,,,,,b,,,c,,,d";
newList=myList.listReduceRight(function(prev,next,idx){ return prev & next & idx },"");
writedump(newList);

Expected Result: d4c3b2a1

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