Practical Object-Oriented Design in Ruby: An Agile Primer Amazon 與 Google Play 暢銷書，眾多人士的高分推薦。 Ruby 程式語言的友善常為人所稱道，不過它也有不利的一面：許多 Ruby 及 Rails 應用程式在設計之初並未考量到後續的演變以及長期的可維護性。網路上總充斥著許多幾乎難以修改或擴展的 Ruby 程式碼。本書
(A story for children with low self-esteem) Ruby hates herself so much that she often feels more like a piece of rubbish than a little girl. Children at school bully her. Sometimes Ruby feels so miser
