public final <V> Flux<V> switchMap(Function<? super T, Publisher<? extends V>> fn) {
		return switchMap(fn, Queues.XS_BUFFER_SIZE);
	}
public final <V> Flux<V> switchMap(Function<? super T, Publisher<? extends V>> fn) {
		return switchMap(fn, Queues.XS_BUFFER_SIZE);
	}
public final < V > Flux < V > switchMap ( Function < ? super T , Publisher < ? extends V > > fn ) { return switchMap ( fn , Queues . XS_BUFFER_SIZE ) ; }
Switch to a new {@link Publisher} generated via a {@link Function} whenever
this {@link Flux} produces an item. As such, the elements from each generated
Publisher are emitted in the resulting {@link Flux}.

<p>
<img class="marble" src="doc-files/marbles/switchMap.svg" alt="">

@param fn the {@link Function} to generate a {@link Publisher} for each source value
@param <V> the type of the return value of the transformation function

@return a new {@link Flux} that emits values from an alternative {@link Publisher}
for each source onNext
Switch to a new { @link Publisher } generated via a { @link Function } whenever this { @link Flux } produces an item . As such the elements from each generated Publisher are emitted in the resulting { @link Flux } .