Data commit

Task/Variadic-function/Haskell/variadic-function-1.hs

@@ -0,0 +1,17 @@
+class PrintAllType t where
+    process :: [String] -> t
+
+instance PrintAllType (IO a) where
+    process args = do mapM_ putStrLn args
+                      return undefined
+
+instance (Show a, PrintAllType r) => PrintAllType (a -> r) where
+    process args = \a -> process (args ++ [show a])
+
+printAll :: (PrintAllType t) => t
+printAll = process []
+
+main :: IO ()
+main = do printAll 5 "Mary" "had" "a" "little" "lamb"
+          printAll 4 3 5
+          printAll "Rosetta" "Code" "Is" "Awesome!"

Task/Variadic-function/Haskell/variadic-function-2.hs

@@ -0,0 +1,7 @@
+{-# LANGUAGE GADTs #-}
+...
+
+instance a ~ () => PrintAllType (IO a) where
+    process args = do mapM_ putStrLn args
+
+...