[FIXED] What is difference between LaunchedEffect parameters?

Issue

When I use LaunchedEffect in jetpack compose screen, what is difference between using viewmodel and Unit in key1 parameter?

Solution

From the documentation (href="https://developer.android.com/jetpack/compose/side-effects#launchedeffect" rel="nofollow noreferrer">https://developer.android.com/jetpack/compose/side-effects#launchedeffect) :

LaunchedEffect restarts when one of the key parameters changes.

Using Unit would guarantee this will only run once for the composable scope (Unit being an object) no matter how many times it is recomposed, where as if the viewmodel "changes" (equals method returns false) it would be "launched" again (lambda block would execute again, cancelling the previous suspend block first).

Answered By - Mark
Answer Checked By - Clifford M. (JavaFixing Volunteer)