Practical Object-Oriented Design: An Agile Primer Using Ruby

Explores practical object-oriented design (OOD), particularly within the context of Ruby programming, offering guidance for creating changeable and maintainable software. It covers fundamental principles such as single responsibility, managing dependencies, and designing flexible interfaces, emphasizing the importance of messages over classes and the strategic use of public and private interfaces. The material also explains advanced concepts like duck typing, classical inheritance, and object composition, contrasting their benefits and costs to help developers choose appropriate architectural relationships. Furthermore, it provides essential advice on designing cost-effective tests that support refactoring and reduce overall development costs, highlighting that well-designed applications and tests inherently lower maintenance burdens.

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