A callback method that is invoked immediately after
Angular has completed initialization of a component's view.
It is invoked only once when the view is instantiated.
A callback method that is invoked immediately after the
default change detector has checked data-bound properties
if at least one has changed, and before the view and content
children are checked.
A callback method that is invoked immediately after Angular has completed initialization of a component's view. It is invoked only once when the view is instantiated.