Haskell by Example: Variadic Functions

original

Use list.

sum' :: [Int] -> IO ()
sum' xs = do
    putStr $ show xs ++ " "
    print $ sum xs

main = do
    sum' [1, 2]
    sum' [1, 2, 3]

    let nums = [1, 2, 3, 4]
    sum' nums

$ runhaskell variadic-functions.hs
[1,2] 3
[1,2,3] 6
[1,2,3,4] 10

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