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Fully updated for Ruby 2.5, this guide shows how to Each technique is illustrated with extended examples in the easy-to-understand Ruby programming language, all downloadable from the companion website,. Sandi Metz demonstrates how to build new applications that can “survive success” and repair existing applications that have become impossible to change. Practical Object-Oriented Design, Second Edition, immerses you in an OO mindset and teaches you powerful, real-world, object-oriented design techniques with simple and practical examples. Unfortunately, the world is awash with object-oriented (OO) applications that are difficult to understand and expensive to change. Object-oriented programming languages exist to help you create beautiful, straightforward applications that are easy to change and simple to extend. The Complete Guide to Writing Maintainable, Manageable, Pleasing, and Powerful Object-Oriented Applications