On Tuesday, November 22, 2016 at 4:59:22 AM UTC, Gusztáv Szikszai wrote:
>
> I think you are looking for something like this: 
> https://github.com/gdotdesign/elm-ui/blob/master/source/Ui/Helpers/Emitter.elm
>  
> It's a pure Elm pub / sub effects module (and possibly the most minimal 
> example of an effect module).
>

Yes, that is perfect for my use case, thanks. This should be added to the 
official packages?

I was wondering, would it be possible to make a send/listen pair where the 
type of the item being transmitted is variable? For example, the 
send/listen pair for a Json Value is:

send : String -> Value -> Cmd msg
listen : String -> (Value -> msg) -> Sub msg

But given there is no native code at all, why translate to json? It seems 
unnecessary. Instead I want a constructor for the send/listen pair:

mailbox : String -> (a -> Cmd msg, (a -> msg) -> Sub msg)

That is, I provide the name of the channel and it returns a send/listen 
pair that operate on type 'a'. Or perhaps it is just:

send : String -> a -> Cmd msg
listen : String -> (a -> msg) -> Sub msg

Is there some reason this cannot be done?

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