YAGNI

You aren't gonna need it

principle of extreme programming that states a programmer should not add functionality until deemed necessary

YAGNI是英文 “You aren't gonna need it” 的缩写，一般认为属于软件工程方法极限编程。YAGNI 原则指出，程序员应该在面临确凿的需求时，才实现相应功能。

摘自维基百科「YAGNI」，CC BY-SA 4.0

中文维基百科英文维基百科 Wikidata

类型: 首字母缩略字
是……的一个方面: 软件开发、极限编程

百科正文

在 YAGNI 的实践中，建议配合单元测试、持续整合和代码重构；以避免产生难以维护的代码（技术负债）。

以上内容摘自维基百科「YAGNI」，按 CC BY-SA 4.0 使用，去掉了参考文献、外部链接等尾部小节，公式改写成了纯文本。全文、配图和出处见原文。

英文维基百科补充中文条目比较短，下面是英文条目「You aren't gonna need it」的原文

"You aren't gonna need it" (YAGNI) is a principle which arose from extreme programming (XP) that states a programmer should not add functionality until deemed necessary. Other forms of the phrase include "You aren't going to need it" and "You ain't gonna need it".

Ron Jeffries, a co-founder of XP, explained the philosophy: "Always implement things when you actually need them, never when you just foresee that you [will] need them."

Context

YAGNI is a principle behind the XP practice of "do the simplest thing that could possibly work" (DTSTTCPW). It is meant to be used in combination with several other practices, such as continuous refactoring, continuous automated unit testing, and continuous integration. Used without continuous refactoring, it could lead to disorganized code and massive rework, known as technical debt. YAGNI's dependency on supporting practices is part of the original definition of XP.

以上内容摘自英文维基百科「You aren't gonna need it」，按 CC BY-SA 4.0 使用，去掉了参考文献、外部链接等尾部小节，公式改写成了纯文本。全文、配图和出处见原文。