Called with a SubscriptionTracker that must be used to identify the reactive values it depends on,
which ensures it gets reevaluated whenever one of these change.
If you pass the tracker to Reactive.get this is done for you, so this is usually the recommended way to go.
Note that the function is only evaluated when needed (on the first unwrap since creation and any unwrap
after a dependency update), effectively caching the result.
Produces a value based on other reactive values.
Called with a SubscriptionTracker that must be used to identify the reactive values it depends on, which ensures it gets reevaluated whenever one of these change. If you pass the tracker to Reactive.get this is done for you, so this is usually the recommended way to go.
Note that the function is only evaluated when needed (on the first unwrap since creation and any unwrap after a dependency update), effectively caching the result.