Re: type and type string option

O_O OK,
it all makes sense now.

Thanks you

cedlemo

On 19/05/2016 15:41, Pierpaolo Bernardi wrote:
> On Thu, May 19, 2016 at 3:27 PM, cedlemo [email protected]
> [ocaml_beginners] <[email protected]> wrote:>
>> First I have read the documentation of Sys:
>>
>> val getenv : string -> string
>> Return the value associated to a variable in the process environment.
>> Raise Not_found if the variable is unbound.
> This is the documentation for the function getenv in the Sys module in
> the standard library.  But you are using the function getenv from the
> Sys module in the Core library, which is a different library. So you
> should read the documentation for the Core library.
>
>>> Since you're using core, `Sys.getenv` returns a string option
>> Does that mean that like in the documentation Sys.getenv returns a
>> string but when used used with the Core module it returns a string option ?
> they are two different functions which do different things. Yes, they
> have the same name. Yes, they reside in modules with the same name.
> Yes, someone thought this was a good idea. No, I don't know what they
> were smoking.