Exercises and code from "Haskell Programming from First Principles"
Solutions to the exercises from the book "Haskell Programming from First Principles" by Christopher Allen and Julie Moronuki.
Book available for purchase here: http://haskellbook.com/
The cipher code doesn't cycle around the letters when for example "zZ" is inputted as the string: it instead goes to the next unicode letters.
While a function using ord/chr and mods is feasible, I instead just used a recursive function that used a large number of guard blocks:
enumCipher :: String -> Int -> String
enumCipher str shift
| shift < 0 = enumCipher str (mod (26 - shift) 26)
| shift > 26 = enumCipher str (mod shift 26)
| shift == 0 = str
| otherwise = enumCipher (map shiftFunc str) (shift - 1)
where shiftFunc chr
| chr == 'z' = 'a'
| chr == 'Z' = 'A'
| otherwise = succ chr
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