In 1995, design patterns were all the rage. Today, I find the exact opposite. Patterns have become commonplace, and most developers use patterns on a daily basis without giving it much thought. New patterns rarely emerge today that have the same impact of the Gang of Four (GOF) patterns.1 In fact, the industry has largely moved past the patterns movement. Patterns are no longer fashionable. They are simply part of a developer’s arsenal of tools that help them design software systems.

But, the role design patterns have played over the past decade should not be diminished. They were a catalyst that propelled object-oriented development into the mainstream. They helped legions of developers understand the real value of inheritance and ...

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