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Frameworks & web · #jetpackcompose
Use derivedStateOf to memoize filtered lists and UI flags in Jetpack Compose so recomposition only happens when the projected result actually changes, not on every source update.
Learn how to use Jetpack Compose's rememberSaveable to keep UI state like text field content or custom data objects alive across screen rotations and process death, with a worked example and verification steps.
Learn how to hoist UI state out of Jetpack Compose composables to make them pure, reusable, and easy to test, with a concrete counter‑button example and verification steps.
LazyColumn or a scrollable Column? A decision guide covering composition cost, keys, the infinite-constraints crash, and a quick way to validate the difference yourself.
Learn how hoisting state with remember and mutableStateOf keeps composables stateless, limits recomposition scope, and improves UI performance.
When an Android app is restored from Auto Backup, Compose UI state held by rememberSaveable is not recovered. The SavedStateRegistry that backs rememberSaveable is excluded from the backup payload, so any counter, scroll position, or form input stored this way resets to its initial value after reinstall. Persistent storage such as DataStore or SharedPreferen