When should you re-initialize the effect launched by LaunchedEffect in Compose?

In Jetpack Compose, the LaunchedEffect should be re-launched when the key parameters it depends on change. This allows reacting to changes in state or input data.

For example, if you use LaunchedEffect to load data based on a user ID, then when this ID changes, the effect should restart to load new data.

@Composable
fun UserProfile(userId: String) {
    LaunchedEffect(userId) {
        // Load data for the new userId
    }
}

If the key (in this case userId) does not change, the effect will not be restarted, preventing unnecessary operations.