Practical Object Oriented Design in Ruby: An Agile Primer by Sandi Metz (Paperback, 2012)

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The Web is awash in Ruby code that is now virtually impossible to change or extend. This guide will help you Understand how object-oriented programming can help you craft Ruby code that is easier to maintain and upgrade Decide what belongs in a single Ruby class Avoid entangling objects that should be kept separate Define flexible interfaces among objects Reduce programming overhead costs with duck typing Successfully apply inheritance Build objects via composition Design cost-effective tests Solve common problems associated with poorly designed Ruby code.