stringReduceRight

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

stringReduceRight(string, callback, initialValue) → returns any

Member Function Syntax

string.reduceRight(callback, initialValue)

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

Argument Reference

string string
Required

The input string.

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
Required

Initial value which will be used for the reduce operation.

Links more information about stringReduceRight

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 stringReduceRight function

Simple stringReduceRight Example

Demonstrate how the function works from right to left.

myString="abcd";
newString=stringReduceRight(myString,function(prev,next,idx,arr){ return prev & next & idx },"")
writedump(newString);

Expected Result: d4c3b2a1

How Do You Do This In Lucee?

This function will be added to Lucee in Version 6. But if you need to reverse a string now, use the reverse() function.

myString="abcd";
newString=myString.reverse();
writedump(newString);

Expected Result: dcba

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stringReduceRight

Member Function Syntax

Argument Reference

string string Required

callback any Required