purescript-concur-react VS purescript-concur-core

Before 2012, all of my websites were made using HTML, CSS and a sprinkling of JS. Then, I went all-in on AngularJS, followed by React. I started using Typescript and then PureScript and learned more frameworks like Halogen and Concur. I even wrote my own UI framework called purescript-deku.

I was wondering that myself. Here's an Ajax example: https://github.com/purescript-concur/purescript-concur-react...

It could use some type signatures, but it makes sense.

As for managing state, my understanding of the Elm Architecture is that there is one "global" state data structure, and various parts of it are handed down from parent to child. So my question would be the opposite of yours: what if I want local state? Is that possible? There are situations where some toggle being on or off isn't very important and keeping track of it in a global data structure is burdensome

And here is an example of a fully editable tree in a handful of lines of code using signals - https://github.com/purescript-concur/purescript-concur-react/blob/master/examples/src/Test/EditHeadingsSignals.purs.

The author of the article might be interested in seeing the counter example in purescript-concur

1. Application wide state is easy since you can always access state from parent components in child components. The problem occurs when you want to update parent state from child components.

Fortunately, you can make your own abstractions in Concur. For example, you can use a "Wire" - which lets multiple child components share and update parts of the parent's state (https://github.com/purescript-concur/purescript-concur-core/...). Note how this abstraction just uses the high level Concur API, and doesn't depend on the UI backend. With a wire the code might look something like this -

  -- A wire into parent's state, accessible using `with`, and updateable using `wire.send`

Have you looked at signals? AFAICT they are exactly what you are looking for. A signal is just Cofree widget (https://github.com/purescript-concur/purescript-concur-core/blob/master/src/Concur/Core/FRP.purs#L26).