val return : 'a -> 'a option
val (>>=) : 'a option -> ('a -> 'a option) -> 'a option
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 option -> ('a -> 'b) -> 'a option
t >>| f
is t >>= (fun a -> return (f a))
.