As we add new pages to our application, and data to our model, the complexity and maintainability of our application increases. Using the RemoteData pattern, we can modify our page type to represent only the current, valid state of the app.

Examples Main.elm

``` type Msg = TopStoriesFetched (WebData HomeModel)

type Page = Home (WebData HomeModel)

type alias HomeModel = { topStories : List StoryId }

type alias Model = { page : Page }

update : Msg -> Model -> ( Model, Cmd Msg ) update msg model = case msg of TopStoriesFetched webData -> ( { model | page = Home webData }, Cmd.none )

```

Links * Elmseeds Episode 37: RemoteData