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A Common Design Vocabulary ¶
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DesignPatterns provide a common vocabulary for designers to use to communicate, document, and explore design alternatives.
A Documentation and Learning Aid ¶
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Learning these DesignPatterns will help you understand existing object-oriented system.
Describing a system in terms of the DesignPatterns that it uses will make it a lot easier to understand.
An Adjunct to Existing Methods ¶
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DesignPatterns are an important piece that's been missing from object-oriented design methods. (primitive techniques, applicability, consequences, implementations ...)
A Target for Refactoring ¶
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DesignPatterns capture many of the structures that result from refactoring. Using these patterns early in the life of a design prevents later refactorings. But even if you don't see how to apply a pattern until after you've built your system, the pattern can still show you how to change it. Design patterns thus provide targets for your refactorings.
