How can I get nth element from a list?

Question

How can I access a list by index in Haskell, analog to this C code?

int a[] = { 34, 45, 56 };
return a[1];

Answer 1

You can use !!, but if you want to do it recursively then below is one way to do it:

dataAt :: Int -> [a] -> a
dataAt _ [] = error "Empty List!"
dataAt y (x:xs)  | y <= 0 = x
                 | otherwise = dataAt (y-1) xs