What does “! []” Elm code syntax in Todomvc mean

Question

Coming from react, I am learning to understand Elm.

In the Todomvc example code, there is the following code snippet:

-- How we update our Model on a         


        

Answer 1

Note that this syntax is going away in the next version of Elm (0.19) so don't get into the habit of using it ;-)

You can use today, and with 0.19:

update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
  case msg of
    NoOp ->
      (model, Cmd.none)