I got a list, and now I want the nth item. In Haskell I would use !!, but I can't find an elm variant of that.
There is no equivalent of this in Elm. You could of course implement it yourself.
(Note: This is not a "total" function, so it creates an exception when the index is out of range).
infixl 9 !!
(!!) : [a] -> Int -> a
xs !! n = head (drop n xs)
A better way would be to define a total function, using the Maybe data type.
infixl 9 !!
(!!) : [a] -> Int -> Maybe a
xs !! n =
if | n < 0 -> Nothing
| otherwise -> case (xs,n) of
([],_) -> Nothing
(x::xs,0) -> Just x
(_::xs,n) -> xs !! (n-1)
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