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The average software project, in our industry, was written under some aspect of code-and-fix, and without automated unit tests. And we can't just throw this code away; it represents a significant effort debugging and maintaining. It contains many latent requirements decisions. Just as Agile processes are incremental, Agile adoption must be incremental too. No more throwing away code just because it looked at us funny. Mike begins his book with a very diplomatic definition of "Legacy". I'l skip ahead to the undiplomatic version: Legacy code is code without unit tests. Before cleaning that code up, and before adding new features and removing bugs, such code must be de-legacified. It needs unit tests. To add unit tests, you must change the code. To change the code, you need unit tests to show how safe your change was. The core of the book is a cookbook of recipes to conduct various careful attacks. Each presents a particular problem, and slider google forms charts api climbing relatively safe way to migrate the code towards tests. Code undergoing this migration will begin to experience the benefits of unit tests, and these benefits will incrementally make new tests easier to write. These efforts will make aspects of a legacy codebase easy to change. It's an unfortunate commentary on the state of our programming industry how much we need this book. Previously undocumented, these 23 patterns allow designers to create more flexible, elegant, and ultimately reusable designs without having to rediscover the design solutions themselves. The authors begin by describing what patterns are and how they can help you design object-oriented software. They then slider google forms charts api climbing on to systematically name, explain, evaluate, and catalog slider google forms charts api climbing designs in object-oriented systems. With Design Patterns as your guide, you will learn how these important patterns fit into the software development process, and how you can leverage them to solve your own design problems most efficiently. Each pattern describes the circumstances in which it is applicable, when it can be applied in view of other design constraints, and the consequences and trade-offs of using the pattern within a larger design.



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