On 28/01/06, Andrew Savige <[EMAIL PROTECTED]> wrote: > Haskell beginner using GHC. > > I have a function to do some simple arithmetic at run time: > > myeval :: Int -> Int -> String -> Int > myeval x y "+" = (+) x y > myeval x y "-" = (-) x y > myeval x y "*" = (*) x y > -- ... > > While that works, I'm curious to know if it can be done more > elegantly. I'm thinking of something like: > > myeval :: Int -> Int -> String -> Int > myeval x y op = (read op) x y > > Thanks, > /-\
Apart from moving to a lookup Map or something, a simple reordering of the arguments allows you to shorten things up a bit: myeval :: String -> Int -> Int -> Int myeval "+" = (+) myeval "-" = (-) myeval "*" = (*) etc. - Cale _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
