exercise-5-1-fast-reverse.ipynb

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       "The Glorious Glasgow Haskell Compilation System, version 7.10.2"
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    ":!ghc --version"
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       "I have a pen"
      ]
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    ":ext OverloadedStrings\n",
    "\n",
    "import qualified Data.Text as T\n",
    "import qualified Data.Text.IO as T\n",
    "import Data.Monoid ((<>))\n",
    "\n",
    "reverseInside' :: T.Text -> T.Text\n",
    "reverseInside' word\n",
    "  | T.length word <= 3 = word\n",
    "  | otherwise        = T.singleton prefix <> T.reverse inside <> T.singleton suffix\n",
    "    where\n",
    "      prefix = T.head word\n",
    "      inside = T.init (T.tail word)\n",
    "      suffix = T.last word\n",
    "\n",
    "-- sentence = \"wchih is why Esilgnh is slitl pltcefrey lbilege wehn you wtrie it lkie tihs\"\n",
    "sentence = \"I hvae a pen\"\n",
    "\n",
    "T.putStrLn $ T.unwords $ map reverseInside' (T.words sentence)"
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    ":t map\n",
    ":t (<>)\n",
    ":t (++)"
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