Rx.Observable.case(selector, sources, [elseSource|scheduler])

Uses selector to determine which source in sources to use. There is an alias switchCase for browsers <IE9.

Arguments

1. selector (Function): The function which extracts the value for to test in a case statement.
2. sources (Object): A object which has keys which correspond to the case statement labels.
3. [elseSource|scheduler] (Observable | Scheduler): The observable sequence that will be run if the sources are not matched. If this is not provided, it defaults to Rx.Observabe.empty with the specified scheduler.

Returns

(Observable): An observable sequence which is determined by a case statement.

Example