In the realm of software development, designing maintainable and flexible systems is a continual challenge. This book offers a pragmatic approach to object-oriented design, grounded in agile principles and illustrated through Ruby, a language known for its elegance and expressiveness. The author presents practical guidance that empowers developers to write code that is not only functional but also adaptable to change, an essential quality in fast-paced development environments.

• Single Responsibility Principle: Each class should have one reason to change, promoting focused and manageable code components.
• Dependency Injection: Encourages designing classes that receive their dependencies externally,...
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