Greetings.
Why does Haskell let you write functions that are not a part of type class?
For example instead of
elem :: Eq a => a -> [a] -> Bool
map :: (a -> b) -> [a] -> [b]
class Container a where
elem :: Eq b => b -> a b -> Bool
map :: (b -> c) -> a b -> a c
would define methods that can work on all containers, and create a
discipline to write more reusable and generic functions.
Thanks
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