Single source of truth tegese saben piece of data disimpen ing exactly one place, lan kabeh sing butuh baca saka kana — tinimbang nyimpen copies akeh-akehe sing bisa drift out of sync.
Masalah sing disingkal: duplicated, diverging state
() {
[user, setUser] = ({ : });
[displayName, setDisplayName] = ();
() {
({ ...user, : newName });
}
}
