[elm-discuss] Re: port module for JS interop.. without main/view ?

[Jörg Winter]

Hey thanks for that blog-post about this use-case, exactly what I aimed for 
initially.

Meanwhile I discovered that the Elm.embed(node) interop-variant actually 
makes sense for me so I can use Elm's view afterall.
Works great so far.

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[elm-discuss] Re: port module for JS interop.. without main/view ?

[art yerkes]

You do need a main, at the very least to pass init, update and 
subscriptions to the runtime that will iterate your app.  View can return a 
single DOM node and be satisfied.  It won't actually be displayed, but 
needs to be there.

Elm works well in this scenario.  Here's an example I did a while back:

https://medium.com/@prozacchiwawa/the-im-stupid-elm-language-nugget-10-3a9c119ed6f9#.k0ywnnh2f

On Saturday, July 23, 2016 at 3:20:26 PM UTC-7, Jörg Winter wrote:
>
> So I have this port module which lets me invoke elm-actions from JS and 
> get back results into JS
> (Basically I just want to use this elm module like a library of elm 
> functions, no Html rendering needed!)
>
> It seems I have to give it a main function and use Html.App.program, which 
> in turn requires me to define a view function.
>
> Is there any way to expose ports to JS -without- defining a full blown 
> main + view ?
> Just using Elm for implementing a library ?
>
>

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Re: [elm-discuss] port module for JS interop.. without main/view ?

[Jörg Winter]

That is exactly what I did in Js ... I calLed that worker() function, assuming 
there was no requirement to have a view.
Yet elm was complaining when I removed the view function from my (port) module.

view is required in Html.App.program

Removing main entirely does not work either.. elm just won't run anything in 
that case.


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Re: [elm-discuss] Why can 'main' have several types?

[Peter Damoc]

Elm has parametric polymorphism so, functions can work over types that have
one or more type variables.
The type variables are unrestricted BUT, there are three restricted type
variables: number, comparable, appendable.
For example, `number` is restricted to Float and Int.

Maybe it is easier to understand the type of main as one of these
restricted type variables that is restricted to `Html a` and `Program a`.



On Sun, Jul 24, 2016 at 8:58 AM, Duane Johnson 
wrote:

> I was working through Elm in Action (first 2 chapters) today and I
> realized I don't understand how `main` can be of type `Html.Html`:
>
> main =
>>   div [ class "content" ] [ text "Photo Groove" ]
>
>
> In the documentation for `Platform
> `
> it says:
>
> Every Elm project will define main to be some sort of `Program`.
>
>
> Is `Html.Html` a kind of `Program`? Is there some kind of magic going on
> here? Thanks!
>
> Duane
>
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-- 
There is NO FATE, we are the creators.
blog: http://damoc.ro/

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Re: [elm-discuss] Why can 'main' have several types?

[Janis Voigtländer]

No, Html.Html is not related to Program. That Html.Html is permitted as
type of main is special-cased “magic”. It’s useful, for example, to give
SSCCE s when writing bug reports.
​

2016-07-24 7:58 GMT+02:00 Duane Johnson :

> I was working through Elm in Action (first 2 chapters) today and I
> realized I don't understand how `main` can be of type `Html.Html`:
>
> main =
>>   div [ class "content" ] [ text "Photo Groove" ]
>
>
> In the documentation for `Platform
> `
> it says:
>
> Every Elm project will define main to be some sort of `Program`.
>
>
> Is `Html.Html` a kind of `Program`? Is there some kind of magic going on
> here? Thanks!
>
> Duane
>
> --
> You received this message because you are subscribed to the Google Groups
> "Elm Discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to elm-discuss+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>

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