Railo 4.2 Reference
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Object Method Struct.reduce

Iterates over every entry of the given struct and calls the closure with every key/value.
      This function will reduce the struct to a single value and will return this value.
Struct.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, string key, object value[, struct struct]):any].
initalValue object  No inital value passed as part of the first closure call