[erlang-questions] Interesting style i haven't seen....

Colm Dougan <>
Fri Oct 30 17:45:42 CET 2009


I think it works because

Dog:woof()

means the same thing as :

dog:woof(Dog)

.. by virtue of the fact that Dog is a tuple with a first element of
"dog".  I seem to recall this is a consequence of the parametrized
modules feature.

Colm

On Fri, Oct 30, 2009 at 4:25 PM, Greg Smyth <> wrote:
> A friend just came up with this, and i thought it was pretty
> interesting(arguments against doing this kind of thing in Erlang
> aside...) as I'd never seen this type of thing done before...
>
> Anyone care to shed some light on why/how this works:-
>
> %%
> -module(dog).
> -export([new/1, woof/1]).
>
> new(Name) -> {dog, Name}.
>
> woof(Self) ->
>  {dog, Name} = Self,
>  io:format("~p says 'woof!'~n", [Name]).
> %%
>
> % 13> c(dog).
> % {ok,dog}
>
> % 14> Dog = dog:new("Fido").
> % {dog,"Fido"}
>
> % 15> Dog:woof().
> % "Fido" says 'woof!'
> % ok
>
> Many thanks,
> Greg
>
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