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Well, if you're programming in Ruby, a great place to start is the Ruby Science book by ThoughtBot. It's a bottom-up approach to improving your code by identifying code smells and applying OO principles to fix them. Identifying smells in your own code will lead you to the OO principles that you need to learn to build your OO skills.
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Sevalla
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The above allocates a Proc up to MRI 3.1, but doesn't in 3.2. https://github.com/ruby/ruby/pull/6286.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.