Hello!
I have an app that loads some JSON from a website and displays it. The
state of the app could be modelled a bit like this:
type State =
Loading |
Displaying Stuff
type alias Stuff = { … }
Now I am writing the update function to handle messages:
update : Msg -> State -> (State, Cmd Msg)
update msg state = case msg of
UpdateThis -> …
UpdateThat -> …
My problem is that the state can be either Loading or Displaying, but most
of the messages only make sense in the Displaying state, leading me to code
like this:
update : Msg -> State -> (State, Cmd Msg)
update msg state = case msg of
UpdateThis -> case state of
Displaying stuff -> …
_ -> (Failed "Invalid state", Cmd.none)
UpdateThat -> case state of
Displaying stuff -> …
_ -> (Failed "Invalid state", Cmd.none)
Obviously, this is dumb. How can I “divide” the loading and the displaying
part of the app? (Assuming that UpdateThis and UpdateThat can only arrive
in the correct, Displaying state.)
Thank you!
T.
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