SwitchMapExtension<T>  extension 
 
Extends the Stream with the ability to convert one stream into a new Stream whenever the source emits an item. Every time a new Stream is created, the previous Stream is discarded.
- on
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          - Stream<T> 
 
- Stream<
Methods
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  switchMap<S> (Stream< S> mapper(T value)) → Stream<S> 
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      Available on Stream< Converts each emitted item into a Stream using the given mapper function. The newly created Stream will be be listened to and begin emitting items, and any previously created Stream will stop emitting.T> , provided by the SwitchMapExtension extension