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You aren't gonna need it
"You aren't gonna need it"〔〔 (acronym: YAGNI)〔 is a principle of extreme programming (XP) that states a programmer should not add functionality until deemed necessary.〔 XP co-founder Ron Jeffries has written: "Always implement things when you actually need them, never when you just foresee that you need them."〔 Other forms of the phrase include "You aren't going to need it"〔〔 and "You ain't gonna need it".〔
==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. Continuous refactoring in turn relies on automated unit tests or static analysis tools as a safety net and continuous integration to prevent wider integration problems. The efficacy of YAGNI, even when considered in combination with the supporting practices, is controversial. YAGNI's dependency on supporting practices is part of the original definition of XP.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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