第 17 章 一致性

Chapter 17 Consistency

Consistency is a powerful tool for reducing the complexity of a system and making its behavior more obvious. If a system is consistent, it means that similar things are done in similar ways, and dissimilar things are done in different ways. Consistency creates cognitive leverage: once you have learned how something is done in one place, you can use that knowledge to immediately understand other places that use the same approach. If a system is not implemented in a consistent fashion, developers must learn about each situation separately. This will take more time.

一致性是降低系统复杂性并使其行为更明显的强大工具。如果系统是一致的，则意味着相似的事情以相似的方式完成，而不同的事情则以不同的方式完成。一致性会产生认知影响力：一旦您了解了某个地方的工作方式，就可以使用该知识立即了解其他使用相同方法的地方。如果系统的实施方式不一致，则开发人员必须分别了解每种情况。这将花费更多时间。

Consistency reduces mistakes. If a system is not consistent, two situations may appear the same when in fact they are different. A developer may see a pattern that looks familiar and make incorrect assumptions based on previous encounters with that pattern. On the other hand, if the system is consistent, assumptions made based on familiar-looking situations will be safe. Consistency allows developers to work more quickly with fewer mistakes.

一致性减少了错误。如果系统不一致，则实际上两种情况可能不同，但两种情况可能看起来相同。开发人员可能会看到一个看起来很熟悉的模式，并根据以前对该模式的遭遇做出错误的假设。另一方面，如果系统是一致的，则基于熟悉情况的假设将是安全的。一致性允许开发人员以更少的错误来更快地工作。