Keys u Flutteru pomažu frameworku da ispravno identificira i čuva widgete tijekom rekonstrukcija — posebno važno za stateful widgete u listama koji se ponovno uređuju, dodaju ili uklanjaju. Razumijevanje kada su keys potrebni sprječava suptilne, zbunjujuće greške.
Što keys rade
During rebuilds, Flutter MATCHES new widgets to existing elements/state by POSITION and
TYPE. Usually this works fine. But when widgets of the SAME TYPE are reordered/added/
removed in a list, position-matching gets confused → state attaches to the WRONG widget.
→ KEYS give widgets a stable IDENTITY so Flutter matches them correctly across changes.
