[erlang-questions] examples for erlang with joins

Richard O'Keefe <>
Mon Mar 9 02:36:04 CET 2009


On 9 Mar 2009, at 1:04 am, Zvi wrote:
{mochiweb has}
>

> -define(IS_WHITESPACE(C),
>    (C =:= $\s orelse C =:= $\t orelse C =:= $\r orelse C =:= $\n)).
>
> f(C) when IS_WHITESPACE(C) -> ...

Given that we have '=:=' and 'orelse' and 'length',
it wouldn't be much of a change to Erlang to allow
member(C, " \t\r\n") in a guard.
>
> I would suggest some better syntax/operator instead of "and"  
> keyword, like:
>
> f(C = ($\s ^ $\t ^ $\r ^ $\n) ) -> ...

Syntax we _already_ have would be even better.
I looked at the Mochiweb code recently.  My first reaction
was to ask for member/2 in guards; my second reaction was
that character classification predicates would probably be
more to the point.

But none of this really has anything to do with joins.




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