Update a list of a list of elements in a single list?

Question

I have some code which is designed to replace a value in a list

replaceNth n newVal (x:xs)
 | n == 0 = newVal:xs
 | otherwise = x:replaceNth (n-1) newVal xs
         


        

Answer 1

perhaps this does what you want (applied to the list of lists):

replaceNth 1 (replaceNth 3 4 [3,3,3,3,3])