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This page talks about ''higher-order functions'' introduced with [[XQuery 3.0]]. The BaseX-specific <code>hof</code> module containing contains some more very usful useful functions can be found at ([[Higher-Order Functions Module]]).
=Function Items=
basic higher-order function on sequences. It starts from a seed value and incrementally
builds up a result, consuming one element from the sequence at a time and combining it with
the aggregate with of a user-defined function.
Folds are one solution to the problem of not having ''state'' in functional programs.
