Railo 4.2 Reference
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Object Method Array.reduce

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.
Array.reduce(function closure,[object initalValue]):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, [, numericindex [, array]]):any].
initalValue object  No inital value passed as part of the first closure call