Olsen R. Design Patterns in Ruby

Addison-Wesley, 2008. — 352 p.Foreword (From author, because there are no annotations)
Design Patterns: Elements of Reusable Object-Oriented Software, affectionately known by many as the Gang of Four book (GoF) is the first reference work on the topic to be published in a mainstream book. It has sold over half a million copies since 1995 and undoubtedly influenced the thoughts and code of millions of programmers worldwide. I still vividly remember buying my first copy of the book in the late nineties. Due in part to the enthusiasm with which it was recommended to me by my peers, I treated it as part of my coming-of-age as a programmer. I tore through the book in a few days, eagerly thinking up practical applications for each pattern.
It’s commonly agreed that the most useful thing about patterns is the way in which they form a vocabulary for articulating design decisions during the normal course of development conversations among programmers. This is especially true during pair- programming, a cornerstone of Extreme Programming and other Agile processes, where design is an ongoing and shared activity. It’s fantastically convenient to be able to say to your pair, I think we need a strategy here or Let’s add this functionality as an observer.Unfortunately, the book does not have an annotation, so I took the description from the author's preface. Just in case, I have attached the MS Word file into which I translated this book.