[Haskell-cafe] message passing style like in Haskell?

[Brent Yorgey]

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 enough.
> If you have a keyboard that allows greater-than-ascii input, there are
> plenty of options: « » ¡ £ ¥ ł € (R) 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.

-Brent
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