DevOps: What are feature flags?

1// LaunchDarkly / Unleash /.Flagsmith
2import { useFeatureFlag } from "./featureFlags";
3
4function Dashboard() {
5  const showNewUI = useFeatureFlag("new-dashboard-ui");
6
7  if (showNewUI) {
8    return <NewDashboard />;
9  }
10  return <OldDashboard />;
11}
12
13// A/B testing
14function getVariant(userId) {
15  const hash = hashCode(userId);
16  return hash % 2 === 0 ? "A" : "B";
17}
18
19function App() {
20  const variant = getVariant(userId);
21  return variant === "A" ? <VersionA /> : <VersionB />;
22}