On Friday, October 14, 2016 at 2:50:44 PM UTC+1, Peter Damoc wrote:
> On Fri, Oct 14, 2016 at 1:35 PM, 'Rupert Smith' via Elm Discuss <
> elm-d...@googlegroups.com <javascript:>> wrote:
>> 1. Build some support into the Elm compiler for webcomponents. 
> There could also be a direction where Elm compiler only implements support 
> for  Custom Elements. 
> It would be awesome if someone more knowledgeble in JS could research what 
> is the minimal amount of change needed to support that in a nice way. 
> Ideally, it would be some library that would allow the implementation of 
> the custom elements without ports or need for extra JS so that custom 
> elements could be implemented and shared through the official package 
> repository. 
> This could simplify a lot of things, if taken in a 5 years perspective 
> where Elm has even better tools take advantage of all the extra information 
> that the language brings in order to create highly efficient deliverables.  

The thing is... custom elements are only part of what makes a component. 
Indeed in Elm, you don't even really need custom components, since you are 
not working in Html directly but writing functions to generate Html. For 
example, from the elm-mdl library I can do  "Card.view ..." to add a card 
component to my UI. Already the limited pallete of Html has been overcome 
by a library of functions.

The ports are used to receive updates or to set state on the component. In 
a modular sense, a component encapsulates some state and provides a set of 
'methods' to read and write that state in a carefully controlled manner, 
with the intention of providing a nice abstraction for working with a 
component, that cannot be put into an illegal state by reading or writing 
private state.

So in terms of compiler/langauge support that is what is missing - a way 
for one Elm program to include another as a module, but to only be able to 
access that module through a restricted set of events and writeable state.

It is Parnas principles of modular design really.

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