Last updated on
Jan. 11, 2022
|
Also applies to ColdFusion
Description
Iterates over each item of the list and calls the closure to work on the item. This function will reduce the list to a single value and will return the value.
Returns
Any
Syntax
ListReduce(list, callback, initialValue, [delimiter, includeEmptyFields])
History
ColdFusion (2018 release): Introduced named parameters.
ColdFusion 11: Added this function.
Parameters
Parameter |
Req/Opt |
Default |
Description |
|---|---|---|---|
| list | Required | The input list. | |
| callback | Required | Closure or a function reference that will be called for each iteration. The arguments passed to the callback are
|
|
| initialValue | Optional | Initial value which will be used for the reduce operation. The type is any. | |
| delimiter | Optional | comma (,) | The list delimiter. The type is string . |
| includeEmptyFields | Optional | false | Include empty values. The type is boolean. |
Example
<cfscript>
myList="23,54,87,98,11,35,91";
closure=function(value1,value2){
return (value1+value2/ListLen(myList)); // Calculates the average of the values in the list
}
MyVal=ListReduce(myList,closure,0); // Initial value is 0
WriteOutput(#myVal#);
</cfscript>
Output
57
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