ShouldUpdate

• When the state changes, the store flatly notifies all the components.
• By default, the framework uses identical to compare the old and new state to determine if a refresh is needed.
• If we have a very precise request for component refresh, then we can define a ShouldUpdate ourselves.
• Sample Code

bool shouldUpdate(DetailState old, DetailState now) {
    return old.message != now.message;
}