''Reduce'' is a function or method that is used to take the values in an array or a list and apply a function to successive members of the list to produce (or reduce them to), a single value.


;Task:
Show how ''reduce'' (or ''foldl'' or ''foldr'' etc), work (or would be implemented) in your language.


;See also:
* Wikipedia article:   [[wp:Fold (higher-order function)|Fold]]
* Wikipedia article:   [[wp:Catamorphism|Catamorphism]]
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