TrySink

The key into the sink's attribute map.

Or -1 if the number of channels cannot be determined.

Prepares the view to be able to run.

Registers a live observer with this observable. The method is called with the observing function which receives the observable's update message of type A, and the method generates an opaque Disposable instance, which may be used to remove the observer eventually (through the dispose method).

Like react, but also invokes the function with the current state immediately.

Runs the view, whatever that means for the particular object. If the object is not prepared and needs preparing, the view will take care of running the prepare step (without mapping any attr map).