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Re:Ruby Koans by anindyabd on Thursday April 02, 2015 @10:24AM (#9310855)
When I started off with Ruby I tried reading through some freely available books (including Why's Poignant Guide) but going through the koans was by far the fastest and most effective way to learn Ruby syntax.

There are also Go koans: https://github.com/cdarwin/go-koans

Re:Ruby Koans by sciurus on Thursday April 02, 2015 @10:55AM (#9311032)
I found reading The Well-Grounded Rubyist and completing the koans to be a good combination. You get an understanding of the underlying concepts of the language as well as experience with the syntax and core classes.

http://www.manning.com/black3/