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Несомтря на громкие слова в названиии "Database Programming, Data Science, Data Structures & Algorithms" - это просто небольшой справочник. Для абсолютных новичков в Руби (но уже имеющих опыт программирования) очень даже подойдёт. От силы 50 страниц, легко вникаемо.

Metaprogramming Ruby 2

The book is not for beginners in programming. If you already have programming experience, it will be very helpful in understanding the intricacies of Ruby. For example, for me, after php, was a surprise how the so to speak "stack inheritance" works in Ruby .

Also there is an excellent ready-made examples that you can actually adopt and use straight out of the book.

In short - the stuff is really high quality, very clearly explained. In the most difficult moments, you probably will have to re-read that paragraph a couple of times to grasp, but no more. Highly recommend.