package preface

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package preface
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type 'a t = 'a Core.t

The type held by the Monad.

val compose_right_to_left : ('b -> 'c t) -> ('a -> 'b t) -> 'a -> 'c t

Composing monadic functions using Kleisli Arrow (from right to left).

val lift : ('a -> 'b) -> 'a t -> 'b t

Mapping over from 'a to 'b over 'a t to 'b t.

val lift2 : ('a -> 'b -> 'c) -> 'a t -> 'b t -> 'c t

Mapping over from 'a and 'b to 'c over 'a t and 'b t to 'c t.

val lift3 : ('a -> 'b -> 'c -> 'd) -> 'a t -> 'b t -> 'c t -> 'd t

Mapping over from 'a and 'b and 'c to 'd over 'a t and 'b t and 'c t to 'd t.

val times_nel : int -> 'a t -> 'a t option

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

val reduce_nel : 'a t Preface_core.Nonempty_list.t -> 'a t

Reduce a Nonempty_list.t using combine.

val replace : 'a -> 'b t -> 'a t

Create a new 'a t, replacing all values in the 'b t by given a value of 'a.

val void : 'a t -> unit t

Create a new unit t, replacing all values in the 'a t by unit.

val times : int -> 'a t -> 'a t

times n x apply combine on x n times. If n is lower than 1 the function will returns neutral.

val reduce : 'a t list -> 'a t

Reduce a List.t using combine.

val filter : ('a -> bool) -> 'a t -> 'a t

Filtering over Monad_plus.

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