flat
Transforms an ObservableList of type T into a single Observable of type arrow.core.Option<O> by fusing the individual observables obtained from each item in the list.
The emissions are merged, as in the flatMap operator of the ReactiveX convention: the result emits the value of whichever mapped observable emitted, and the current value of the observables of elements joining the list. Observables of elements leaving the list are unsubscribed. Merging has no single current value: Observable.current is the current value of the observable of the first element of the list. To follow only the observable selected by the latest value, use Observables.switchMap instead.
Return
An Observable of type arrow.core.Option<O> that is safe to use on empty lists.
Parameters
A function that maps each element of the source ObservableList to an Observable of type O.
Type Parameters
The type of elements in the ObservableList.
The type of the resulting fused observable.