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I'm a big fan of Codewars (http://www.codewars.com/ http://www.codewars.com/). I'm not sure if I'd consider it Kata though.

• vamega 13y ago
  Signup seems to not be working for me. I keep seeing a bar on the top that says "undefined method `[]' for nil:NilClass"
• guiomie 13y ago
  Pretty cool. Is this just javascript based?
  • zachlatta 13y ago
    Yeah, with Rails on the backend.