YAGNI ('You Aren't Gonna Need It') is a design principle from Extreme Programming (XP) stating that developers should only implement functionality when it is actually needed, not when they anticipate needing it. Ron Jeffries, an XP founder, emphasized doing the simplest thing that works. The principle helps speed up iteration and reduces design fatigue. However, YAGNI works best when paired with continuous refactoring, automated unit testing, and continuous integration — without these practices, skipping upfront design can accumulate significant technical debt. Developers should understand testable code, SOLID principles, and refactoring to apply YAGNI effectively.
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