Replace individual list elements in Haskell?

Question

I have a list of elements and I wish to update them:

from this: [\"Off\",\"Off\",\"Off\",\"Off\"]

to this: [\"Off\",\"Off\",\"On\",\"Off\

Answer 1

Actually, for many cases (not always) where you'd use a List, a Data.Vector is a better choice.

It comes with an update function, see Hackage, that does exactly what you need.