[Haskell-cafe] flip1 through flip9, useful?
Tony Morris
tonymorris at gmail.com
Tue Jan 14 06:57:14 UTC 2014
On 14/01/14 15:48, Christian Marie wrote:
> I have defined a bunch of functions like this:
>
> -- | Move the fourth argument to the first place
> rotate4 :: (a -> b -> c -> d -> e) -> (d -> a -> b -> c -> e)
>
> -- | Reverse four arguments
> flip4 :: (a -> b -> c -> d -> e) -> (d -> c -> b -> a -> e)
>
> I decided to upload this as a library to hackage, as I personally find it
> useful, especially for writing FFI bindings.
>
> It seems like I can't be the first to write a library like this though, am I
> missing something obvious? Is this useful or stupid? Does it exist already?
>
> Full definition here:
>
> https://github.com/christian-marie/flippers/blob/master/src/Control/Flippers.hs
>
>
>
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Why not generalise to any functor?
let flip f a = fmap ($a) f
--
Tony Morris
http://tmorris.net/
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