Awesome! I've only seen one other place doing something similar: https://scrimba.com/
This is definitely better than ordinary videos, and I like the point about multiple explanations. Although I do personally prefer that futurecoder rarely shows/tells without actually forcing users to run code and see for themselves, so they always have to be engaged. Even when they're told the exact code to run, they occasionally get asked to predict what the output will be, to make sure they're paying attention.
> I have no idea what your educational background is, but if you ever want a stable position that supports your educational innovation, consider applying for a teaching faculty job: https://go.cs.illinois.edu/teaching-faculty-hiring. (Currently our openings require a Masters degree.) We need more creators in computer science education.
It'd be great if I could be paid to work on futurecoder or something similar full time, and I've tried finding a way to make that happen before. But now I've just started a dream job at https://ought.org/ (working with AI, not education) and it'd be very hard to compete with that.
I don't have a Masters and I prefer to create things that are infinitely reusable rather than teaching directly. But thanks for the suggestion!