I've been doing some frontend programming these last few months and loved how React and other JS libraries create UIs. So I tried doing something (kind of) similar in Vala and Gtk3 by using properties and bindings to fully separate UI construction and logic.
The full text is available at my blog (https://igordsm.github.io/blog/2021-12-06/) and DEV.to(https://dev.to/igordsm/vala-reactive-programming-2pf4). All code examples are available in Github (https://github.com/igordsm/reactive-gtk-vala).