[erlang-questions] passing a function to lists:map
Bengt Kleberg
bengt.kleberg@REDACTED
Mon Mar 22 12:57:14 CET 2010
Greetings,
You do not need to export the function to be able to use it in a
fun func/arity
expression.
ebngt
On Mon, 2010-03-22 at 12:53 +0100, Jeroen Koops wrote:
> Hi Martin,
>
> use:
>
> -export([ ta/1 ]).
>
> and then:
>
> atomize(List) -> lists:map(fun ta/1, List).
>
> Regards,
>
>
>
> On Mon, Mar 22, 2010 at 12:49 PM, Martin DeMello <martindemello@REDACTED>wrote:
>
> > ta(X) when is_list(X) -> list_to_atom(X);
> > ta(X) when is_tuple(X) -> tuple_to_list(X);
> > ta(X) when is_integer(X) -> X.
> >
> > % this doesn't work
> > atomize(List) -> lists:map(ta, List).
> >
> > % this does
> > atomize(List) -> lists:map(fun(X) -> ta(X) end, List).
> >
> > What's the difference? Have I just got the syntax wrong, or is there
> > some fundamental reason I need the second version?
> >
> > martin
> >
> > ________________________________________________________________
> > erlang-questions (at) erlang.org mailing list.
> > See http://www.erlang.org/faq.html
> > To unsubscribe; mailto:erlang-questions-unsubscribe@REDACTED
> >
> >
More information about the erlang-questions
mailing list