@ CheckReturnValue @ BackpressureSupport ( BackpressureKind . FULL ) @ SchedulerSupport ( SchedulerSupport . NONE ) public final < U > Flowable < U > concatMapIterable ( Function < ? super T , ? extends Iterable < ? extends U > > mapper ) { return concatMapIterable ( mapper , 2 ) ; }
Returns a Flowable that concatenate each item emitted by the source Publisher with the values in an Iterable corresponding to that item that is generated by a selector .