iced-counter2 VS elm-architecture-tutorial

The iced package requires the messages to implement the Debug, Clone, and Send traits, none of which are available for closures. I was able to implement something similar to your example[0] but it only supports plain function pointers for the callbacks. The compiler wasn't able to derive a sufficiently general Debug trait for the function pointer due to an issue with the lifetime of the argument, so I had to implement that myself as well.

Incidentally, as long as there are situations where only function pointers can be used and not closures it would be really nice to have some support for anonymous function pointers in Rust (with the fn type and not just the Fn trait) so that one could write e.g. "Message(fn |c| c.value += 1)" instead of "Message({ fn f(c: &mut Counter) { c.value += 1 } f })". Or just infer the fn type for "closures" which don't actually close over any variables without the need for an extra keyword.

[0] https://github.com/nybble41/iced-counter2/blob/master/src/ma...

I'm learning Haskell right now, pure functional language, but if anyone is interested, Elm is based on Haskell and much easier to learn. Elm is a web development language that compiles to JS. https://guide.elm-lang.org/

Elm is a different approach that compiles into JavaScript. In the extreme case, you have Emscripten which will compile many language into JavaScript but will feel really clumsy compared to using JavaScript in a lot of cases.

And if you want to stay in the UI realm, Elm is a good introduction into functional programming.

If you want to get better at data structures you should strongly consider learning a functional language. A huge part of functional programming is manipulating data structures. The language Elm is a great place to start for you since it's frontend specific. For example, check out the doc page for the Dict data type and see if that kind of stuff is what you're looking for.

https://guide.elm-lang.org/ for a high level guide, and an unstyled button example https://elm-lang.org/examples/buttons.

I hope this tiny guide was helpful, and that you learned something new today. If you want to learn more about Elm, you should check out the official guide or say hello in the Elm Slack #beginners channel

https://guide.elm-lang.org/ is always a solid example for me

After going through the whole Introductory Guide to the Elm Language and reading the Elm in Action book, I already felt quite comfortable developing webapps in this paradigm. I liked Elm so much that I started a project to teach programming to beginners using this language and made the first classes available on the website elm.dev.br (in Brazilian Portuguese).