Andrew Savige wrote:
--- Cale Gibbard wrote:
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.
Thanks to all for the excellent suggestions. I'm liking the
Haskell version of this function a lot more now. :-)
To help me learn Haskell, I'm converting a small Ruby
program to Haskell. In Ruby this can be done in one line:
def myeval(x, y, op)
x.send op, y
end
This could be done in Haskell by
myeval :: a->b->(a -> b -> c) -> c
myeval x y op = op x y
eg myeval (+) 1 2
Regards, Brian.
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