derivedStateOf

vs

remember

. When should I prefer one over the other?

derivedStateOf is for when you need to read State objects to calculate your value. If you already have a State, it might be a good fit. Remember takes explicit keys, so it can handle that as well but is a bit more verbose. If you find yourself writing something like

val input: State<Int> = …
val

state by remember {

mutableStateOf(input.value * 2)
}.apply { value = input.value * 2 }

hen it might be time for derivedStateOf

Ah thanks. I'll be using that

derivedStateOf

more now.

From what I remember, you don't need derivedStateOf. You can just do val sum = a + b

Yes, for this example, you can just do the calculation. In a real use case, you’d presumably be doing some more expensive calculation.