data Datum = S String | D Double
lst :: [Datum]
lst = [S "a", D 3.14]
In Python we'd have to write the logic to handle both cases and fail with an exception or do an instanceof check. In Haskell we'd do this by pattern matching on the sum type.
case (lst !! 42) of
S n -> -- handle string
D n -> -- handle number
Comments
Use a sum type:
In Python we'd have to write the logic to handle both cases and fail with an exception or do an instanceof check. In Haskell we'd do this by pattern matching on the sum type.