> data Foo = Foo { a :: Int, b :: String }
>
> instance Show Foo where
> show f = show (a f) ++ " " ++ show (b f)
>
> foo = Foo { a = 99, b = "green bottles\n" }
>
> main = do print foo
> let bar = foo { a = 98 }
> print bar
The above code is from Haskell FAQ. I could not find the "data Foo = Foo
}" notation in my Haskell, The Craft of Functional Programming book. What
does it mean?
Also
> instance Show Foo where
> show f = show (a f) ++ " " ++ show (b f)
I do not understand show (a f) either. And same goes for "foo { a = 98 }"
notation.
Could you help me on this notation?
Thanks
