base

Full standard library replacement for OCaml
IN THIS PACKAGE
include Applicative.S with type 'a t := 'a t
val both : 'a t -> 'b t -> ('a * 'b) t
val (<*>) : ( 'a -> 'b ) t -> 'a t -> 'b t

same as apply

val (<*) : 'a t -> unit t -> 'a t
val (*>) : unit t -> 'a t -> 'a t
val (>>|) : 'a t -> ( 'a -> 'b ) -> 'b t
val apply : ( 'a -> 'b ) t -> 'a t -> 'b t
val map2 : 'a t -> 'b t -> f:( 'a -> 'b -> 'c ) -> 'c t
val map3 : 'a t -> 'b t -> 'c t -> f:( 'a -> 'b -> 'c -> 'd ) -> 'd t
module Applicative_infix : sig ... end
include Monad.S with type 'a t := 'a t
val (>>=) : 'a t -> ( 'a -> 'b t ) -> 'b t

t >>= f returns a computation that sequences the computations represented by two monad elements. The resulting computation first does t to yield a value v, and then runs the computation returned by f v.

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

t >>| f is t >>= (fun a -> return (f a)).

module Monad_infix : sig ... end
val bind : 'a t -> f:( 'a -> 'b t ) -> 'b t

bind t ~f = t >>= f

val return : 'a -> 'a t

return v returns the (trivial) computation that returns v.

val map : 'a t -> f:( 'a -> 'b ) -> 'b t

map t ~f is t >>| f.

val join : 'a t t -> 'a t

join t is t >>= (fun t' -> t').

val ignore_m : 'a t -> unit t

ignore_m t is map t ~f:(fun _ -> ()). ignore_m used to be called ignore, but we decided that was a bad name, because it shadowed the widely used Caml.ignore. Some monads still do let ignore = ignore_m for historical reasons.

val all : 'a t list -> 'a list t
val all_unit : unit t list -> unit t

Like all, but ensures that every monadic value in the list produces a unit value, all of which are discarded rather than being collected into a list.

module Let_syntax : sig ... end

These are convenient to have in scope when programming with a monad: