You aren't gonna need it
Software engineering principle / From Wikipedia, the free encyclopedia
"You aren't gonna need it"[1][2] (YAGNI)[3] is a principle which arose from extreme programming (XP) that states a programmer should not add functionality until deemed necessary.[4] Other forms of the phrase include "You aren't going to need it" (YAGTNI) [5][6] and "You ain't gonna need it" (YAGNI).[7]
Software engineering principle
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."[8] John Carmack wrote "It is hard for less experienced developers to appreciate how rarely architecting for future requirements / applications turns out net-positive."[9]