medium10 pts · first answer countsandroidjetpack-composestate

Adding to a list in state

Items are added with items.add(x), but the LazyColumn does not update. Why?

val items by remember { mutableStateOf(mutableListOf<String>()) }
// later
items.add("New order")

A.LazyColumn can only ever show immutable listsB.add() is always run on a background threadC.Same list object, so no change seen; use mutableStateListOfD.The list needs a key parameter before it updates

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Adding to a list in state

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