I’m not in Ruby core or, well, even a confident C coder anymore, but I’ve long enjoyed digging in the Ruby MRI source code to understand weird behavior and to pick up stuff for my Ruby course.

Pat Shaughnessy is also a fan of digging around in Ruby’s internals and has written some great posts like How Ruby Executes Your Code, Objects, Classes and Modules, and Exploring Ruby’s Regular Expression Algorithm.

When Pat released his Ruby Under a Microscope book, I knew it would be right up my street! He digs into how objects are represented internally, why MRI, Rubinius and JRuby act in certain ways and, of course, “lots more.”

I invited Pat to take a very high level cruise through the MRI codebase with me so we could share that knowledge with Ruby programmers who haven’t dared take a look ‘under the hood’ and to show it’s not as scary or pointless as it may seem. Read More

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