The core is the data change tracking and UI update problems
Concept finishing:
Called for the use of data services;
UI called for the state to use;
Changes in the UI can be monitored;
Data changes in real-time to reflect on the UI;
Data Change - "knockdown -> UI Reset state -" Update the UI;
UI status change -> Data status - "block
The UI state variables upgraded to monand variables
Setting and subscriptions;