Summary
The pattern movement has revolutionized the way people are developing software. By capturing the wisdom of experts in their respective areas, pattern catalogs can be used for software engineering, library design, and all areas where they are available. The famous GoF pattern book started the whole movement in the year 1994. Some notable catalogs include POSA, POEAA, EIP, J2EE, DDD, and Arlow/Nuestadt. We have also seen how a multi-paradigm language such as C# is well-suited for pattern-based software development, considering the language's evolution in terms of features. We will continue to explore the applicability and consequence of patterns in the following chapters. We will also be looking at the key design principles, and will explain the need for design patterns using an application case study.
