Exercism v3 is up

https://twitter.com/exercism_io

That said, I've found Excercism in its previous incarnation a fantastic resource. Various programming languages had learning tracks of exercises grouped by level of difficulty, like koans. A volunteer mentor would follow your work and send reviews, finally okaying it or suggesting you put in more work. Then you could compare your answer with those of other members. Because there were so many languages involved and they had similar or sometime even identical exercises there was also a kind of Rosetta Stone effect -- ah, yeah, here's what a good Pythonic solution to this looks like, whereas in TypeScript it'd be more like that, in Clojure like this, in Elixir like that, and so on.