The code in the rust folder does contain the completed code that was done for my front end masters course. The danger to seeing it in its completed state is that the final part, which displays the pain of working with the borrow checker, will be exposed! So please, go through the course, before looking into the code too deep.
I intentionally used non standard descriptions or terms for things. One thing that really sticks out is pointing out that options have the map function which allows them to be inserted into iterator chains. that is not technically true, but I felt that it was the easiest way to consume the idea for a dev coming from TypeScript.
Hate the language, not the player