[Haskell-cafe] Is 'flip' really necessary?
daniel.is.fischer at web.de
Sun Jul 25 17:27:32 EDT 2010
On Sunday 25 July 2010 23:13:16, aditya siram wrote:
> Eta-reducing is nice, and sometimes it makes code more readable. But
> 'flip' is one of those functions that always seems to hinder rather than
> help readability, conversely factoring out flip always makes code easier
> to comprehend. I don't see a need for its existence - maybe I'm missing
> something and more experienced Haskellers can comment.
sortBy (flip compare)
is very convenient (easier to parse¹ and it provides fewer opportunities
for error than (\a b -> compare b a)).
foldl' (flip Set.insert) Set.empty values
and such stuff.
Sometimes, functions have the wrong argument order for what you want to do,
then flip is very handy.
¹ This is of course not a universal truth but a personal preference.
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