Batteries user guide : BatOption.Monad

# Module BatOption.Monad

    module Monad: sig .. end

This module provides everything needed to write and execute computations in the Option monad.

    type 'a m = 'a option

The type of values in this monad : option

    val return : 'a -> 'a m

`return x` puts a value in the Option monad, that is, returns `Some x`.

    val bind : 'a m -> ('a -> 'b m) -> 'b m

`bind m f` combines the calculation result `m` with the function `f`. E.g, in the Option monad : `bind (Some 1) (fun x -> if x = 1 then Some 4 else None)` returns Some 4.