Re: [Haskell-beginners] flip lookup in ghci

On Fri, Feb 20, 2009 at 12:44 PM, Matt R wrote:

Rafael Gustavo da Cunha Pereira Pinto :

...

you are applying the type to lookup only!

try let lookupIn = ((flip lookup ) :: (Eq a) => [(a, b)] -> a -> Maybe b )

Oops, I didn't mean to include my attempts at type annotation in my previous email...I meant to write

ghci> let lookupIn = flip lookup

But it doesn't seem to make any difference either way. I still get

ghci> :t lookupIn lookupIn :: [((), b)] -> () -> Maybe b

regardless :(

Indeed, how funky: GHCi, version 6.8.2: http://www.haskell.org/ghc/ :? for help Loading package base ... linking ... done. Prelude> :t flip lookup flip lookup :: (Eq a) => [(a, b)] -> a -> Maybe b Prelude> let lookupIn = flip lookup Prelude> :t lookupIn lookupIn :: [((), b)] -> () -> Maybe b Prelude> /M -- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnus＠therning．org Jabber: magnus＠therning．org http://therning.org/magnus identi.ca|twitter: magthe