In Haskell you define your functions and its arity. // nullary function a :: () => () -> String a = "Hello World" // unary function b :: (Integral c) => c -: String b x = "Hello Integral"
I think in Clojure and Scala you can define the arity of the function too. For the users of [functor] I think it would be easier to migrate their code to Java 8, or use it with Java 8, if both [functor] and Java 8 Function classes had similar behaviour. That would be interesting especially if the lambda project provided a backport jar. [functor] and lambda project provide 1 and 2 arities by default, but lambda doesn't provide nullary interfaces (or at least I couldn't find them in java.util.functions). Cheers Bruno P. Kinoshita http://kinoshita.eti.br http://tupilabs.com ----- Original Message ----- > From: Matt Benson <gudnabr...@gmail.com> > To: Commons Developers List <dev@commons.apache.org>; Bruno P. Kinoshita > <brunodepau...@yahoo.com.br> > Cc: > Sent: Tuesday, January 29, 2013 8:57 PM > Subject: Re: [functor] Change default arity of Function, Predicate and > Procedure > > What about in pure functional languages e.g. Haskell? > > Matt > > > On Tue, Jan 29, 2013 at 4:55 PM, Bruno P. Kinoshita < > brunodepau...@yahoo.com.br> wrote: > >> Hi all, >> >> In Java 8 and Guava the default arity of a Function is 1, but in [functor] >> it is 0, IOW, in Java 8 and Guava a Function is by default a UnaryFunction, >> while in [functor] it is a NullaryFunction. >> >> What do you guys think of changing the default arity of Function, >> Procedure and Predicate in [functor] to 1, rather than 0? >> >> Cheers >> >> Bruno P. Kinoshita >> http://kinoshita.eti.br >> http://tupilabs.com >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org >> For additional commands, e-mail: dev-h...@commons.apache.org >> >> > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
