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

On Thu, Jun 19, 2008 at 3:35 AM, Ketil Malde wrote:

jinjing writes:

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Any way here's the code:

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module Dot where import Prelude hiding ( (.) )

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(.) :: a -> (a -> b) -> b a . f = f a

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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