If you want to see some example code, there is a bunch of little scripts here:
https://github.com/jonathanhogg/flitter-examples
At some point I will put sample outputs in there too so you can see what they do without running them, but it won’t be for a few weeks…
If you’re wondering what the paradigm is, it’s roughly JSX but with a functional language: evaluate an expression 60 times a second to generate a node tree that describes what the screen looks like