[Haskell-cafe] message passing style like in Haskell?
derek.a.elkins at gmail.com
Thu Jun 19 21:53:54 EDT 2008
On Thu, 2008-06-19 at 15:24 -0400, Brent Yorgey wrote:
> On Thu, Jun 19, 2008 at 3:35 AM, Ketil Malde <ketil at malde.org> wrote:
> jinjing <nfjinjing at gmail.com> writes:
> > Any way here's the code:
> > module Dot where
> > import Prelude hiding ( (.) )
> > (.) :: a -> (a -> b) -> b
> > a . f = f a
> > infixl 9 .
> Isn't this (roughly?) the same as flip ($)?
> As a side note, may I advise you to use another symbol, and
> leave the
> poor dot alone? Overloading it as a module separator is bad
> If you have a keyboard that allows greater-than-ascii input,
> there are
> plenty of options: « » ¡ £ ¥ ł € ® ª...
> Note that there already is a standard symbol for this, (>>>) from
> Control.Arrow. Well, actually (>>>) is more general than backwards
> function composition, so maybe making your own symbol is still a good
> idea while you're learning.
Application, not composition. Cont's return would work if it weren't
for the wrapping. Similarly, (>>=) for the Id monad.
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