get element by id about elm-list-extra HOT 6 CLOSED

Thanks, please submit a PR and remember to export the function, add a @doc + elm build to test it works. I think that probably the most efficient implementation will be something like:

List.head <| List.drop index list

For the infix priority, I left it unspecified (default is infixl 9 afaik) when I implemented (?) on Maybe. I suspect that's also a good default for !! since you most likely what !! to bracket on the left for multidimensional arrays. E.g.

matrix !! 3 !! 2 -- row 3, column 2 in a row-major 2x2 matrix

from elm-list-extra.

what do you mean with export and elm build ?

from elm-list-extra.

Just basically add the function in the export list you'll see at the top of the file:

module List.Extra
  ( last
  , ... 
  ,  <- Please add it here
  )  where

and then also build the package to make sure it compiles (We get many PR's that don't compile or don't export the newly added function :)).

from elm-list-extra.

Here's a complete implementation, if anyone would like to make a PR:

{-| Returns Just the element at the given index in the list,
or Nothing if the list is empty.
-}
getAt : Int -> List a -> Maybe a
getAt index list =
    List.head (List.drop (index) list)

from elm-list-extra.

I merged #22

from elm-list-extra.

Looks good, thank you for merging

from elm-list-extra.