Zed has got it twisted. Khan Academy's environment was 'inspired' by Victor's 'Inventing on Principle' talk which encompassed much more than what's discussed here. Resig did not implement Victor's 'Learnable Programming' article, because the article was, in fact, a response to the Khan Academy implementation. I imagine Victor built upon Resig's work to make those little demos in the article. Victor explicitly states JavaScript is a poor educational language, and the demos are just the simplest examples of his principles, by extending the Khan Academy model. [1]

[1] http://worrydream.com/LearnableProgramming/ (the bottom)