[Haskell-cafe] Different return type?

[John Ky]

Hi,

Possibly a silly question but is it possible to have a function that has a
different return type based on it's first argument?

For instance

data Person = Person { name :: String, ... }
data Business = Business { business_number :: Int, ...}

key person = name person
key business = business_number business

Thanks

-John
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