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greeting('Woah'); # Waits
...
greeting('Nelly'); # prints now that it has both arguments

    greeting verb object = putStrLn (verb ++ ", " ++ object)

    greeting :: String -> String -> IO ()

    greeting :: String -> ( String -> IO () )

    greeting "Hello" "World"
    (greeting "Hello") "World"
    ((greeting) "Hello") "World"

    greeting "Hello" "World" :: IO ()
    greeting "Hello"         :: String -> IO ()
    greeting                 :: String -> String -> IO ()

    sub foo { print "@_" }

    (-) 2 1            ==>  1
    flip (-) 2 1       ==> -1

    dec1 = flip (-) 1
    dec1 2             ==> 1