September 2017 Update

Task/URL-decoding/Haskell/url-decoding-2.hs

@@ -0,0 +1,13 @@
+import Data.Char (chr)
+import Data.List.Split (splitOn)
+
+deCode :: String -> String
+deCode url =
+  let ps = splitOn "%" url
+  in concat $
+     head ps :
+     ((\(a, b) -> (chr . read) (mappend "0x" a) : b) <$> (splitAt 2 <$> tail ps))
+
+-- TEST ------------------------------------------------------------------------
+main :: IO ()
+main = putStrLn $ deCode "http%3A%2F%2Ffoo%20bar%2F"