When comparing The Bastards Book of Ruby vs Ruby Essentials, the Slant community recommends The Bastards Book of Ruby for most people. In the question“What are the best resources to learn Ruby?” The Bastards Book of Ruby is ranked 10th while Ruby Essentials is ranked 20th. The most important reason people chose The Bastards Book of Ruby is:
Available for free online.
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Pros
Pro Free
Available for free online.
Pro Free
Available online for free.
Cons
Con Currently little activity from the writers
This series, which is great, has not seen many updates from the developers who are writing the project. It appears that this is because they have had to focus their time in other more pressing development projects. But currently, it doesn't appear that this resources is entirely active. However, it's great in content and quality, so I would suggest checking for future updates.