Using an accumulator, "iterating"...

[Brett Kelly]

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Hello all,

I'm trying to write a function that takes a list and a element (same type) =
and
returns the index of the first instance of the element in the list.  like:
getindex "brett" 'e' would return 2, etc.

i'm trying to accomplish this using an accumulator, here's what i've got:

pyindex :: Eq a =3D> a -> [a] -> Maybe Int
pyindex c l =3D pyindex' 0 chr (x:xs)
    where pyindex' count chr (x:xs) =3D do
        if x =3D=3D chr=20
          then return count
          else pyindex' (count + 1) chr xs

now, i know i've got a syntax problem, because i'm pretty sure my logic is
correct (or at least MOSTLY correct).

can anybody see what's wrong with my stuff?

thanks!
--=20
Brett Kelly
bkelly@sourcereview.net
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