本文介绍了软件开发中的三个重要原则：YAGNI（You ain't gonna need it），鼓励程序员只在真正需要时才增加功能；DRY（Don't repeat yourself），旨在减少重复信息并确保每条信息唯一且权威的表示；KISS（Keep it simple, stupid），提倡简单直接的设计理念。
Just YAGNI, DRY and KISS for everything.
YAGNI - You ain't gonna need it
YAGNI is the principle in extreme programming that programmers should not add functionality until it is necessary. Ron Jefries writes, "Always implement things when you actually need them, never when you just foresee that you need them."
DRY - Don't repeat yourself
In software engineering, Don't Repeat Yourself or Duplication is Evil is a principle of software development aimed at reducing repetition of information of all kinds, especially useful in multi-tier architectures. The DRY principle is stated as "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system." The principle has been formulated by Andy Hunt and Dave Thomas in their book The Pragmatic Programmer. You can use refactor to remove duplication.
KISS - Keep it simple stupid by Kelly Johnson
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