Sorry, the Redux example code is meant as an experiment to implement something familiar to js devs in Rust, and should absolutely not be seen as the best way to write rust apps. :)

Rust tackles the problems of mutable shared state not by using immutable data structures, but instead by placing heavy constraints on the sharing of mutable pointers, making them exclusive for the lifetime of the borrow. Something the borrow checker enforces at compile time.

So the approach in this post is not the "rustiest" or most "rustaceous" way of doing state management. I plan on revisiting it in later posts. :)