Railo 4.2 Reference
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Object Method String.listReduce

Iterates over every entry of the given array and calls the closure with every element.       This function will reduce the array to a single value and will return the value.
String.listReduce(function closure,[object initalValue,[string delimiter,[boolean includeEmptyFields,[boolean multiCharacterDelimiter]]]]):any


The arguments for this function are set. You can not use other arguments except the following ones.
Name Type Required Description
closure function  Yes function/closure that implements the following constructor [function(any result, object value, numeric index , string list, string delimiter):any].
initalValue object  No inital value passed as part of the first closure call
delimiter string  No delimiter used to separate the string list
includeEmptyFields boolean  No include empty fields or not
multiCharacterDelimiter boolean  No specifying whether the delimiters parameter specifies a multi-character delimiter. If this parameter is true, the delimiters parameter must specify a single delimiter consisting of multiple characters. This parameter enables the ListToArray function to convert a list such as the following to an array of color names: red:|orange:|yellow:|green:|blue:|indigo:|violet.