package preface

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package preface
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A generic monoid.

val times : ('a -> 'a -> 'a) -> int -> 'a -> 'a option

times combine n x apply combine on x n times. If n is lower than 1 the function will returns None .

val reduce_nel : ('a -> 'a -> 'a) -> 'a Nonempty_list.t -> 'a

reduce_nel combine list Reduce a Nonempty_list.t using combine.

val reduce : ('a -> 'a -> 'a) -> 'a -> 'a list -> 'a

reduce combine neutral list Reduce a list using combine and neutral as initial value.