Haskell : unit : Return nothing from IO action

Haskell provides (), which is pronounced as unit. You can return () from an I/O action if you don't want to return anything.

main = do
    putStrLn "Hello "
    let a = 10
    let b = a + 10
    return ()

processInfo :: IO ()
processInfo = do
        putStrLn "Hello Haskell"  
        return ()

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