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Re:Ruby Koans by cpursley on Thursday April 02, 2015 @09:09AM (#9310451)
Ruby Koans are great. Some others along the same idea area:

* https://github.com/JoshCheek/ruby-kickstart

* https://github.com/alexch/learn_ruby

Re:Ruby Koans by dhsb on Thursday April 02, 2015 @10:25AM (#9310858)
https://rubymonk.com/ is another good one. The theme got a little tiresome after a while but the lessons really forced me to mess around with Ruby in the console. I learned a lot.