I am a fan of http://www.rubykoans.com http://www.rubykoans.com for Ruby. I am thinking about developing something similar using the Go playground for that lang

I am a fan of http://www.rubykoans.com http://www.rubykoans.com for Ruby. I am thinking about developing something similar using the Go playground for that language, and maybe an alternative for Rust. Where I'd want to stretch it is some data structure and algorithm exercises, maybe even some design patterns. I'd love to be able to have a common environment where I can start to learn any one of multiple languages using similar exercises.