[Haskell-cafe] Roman to Decimal Algorithms

[Tillmann Rendel]

Hi Andrew,

Andrew Savige wrote:
  > Noticing this, you can replace the 205558`mod`(ord c)`mod`7 magic
> formula with a function that returns a string index (index() in
> Perl and Python). I am sometimes overwhelmed by the quantity and
> richness of all the functions in the GHC Haskell libraries.

Have you tried hoogle?

   http://haskell.org/hoogle/?hoogle=String+-%3E+Maybe+Int

This suggests Data.List.elemIndex.

   Tillmann