Method concatMapSingle

src/main/java/io/reactivex/rxjava3/core/Maybe.java:3171–3176

Returns a Maybe based on applying a specified function to the item emitted by the current Maybe, where that function returns a Single. When this Maybe just completes the resulting Maybe completes as well. <img width="640" height="315" src="https://raw.gith

(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper)

     * @since 3.0.0
     */
    @CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public final <@NonNull R> Maybe<R> concatMapSingle(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper) {
        return flatMapSingle(mapper);
    }

    /**
     * Returns a {@link Flowable} that emits the items emitted from the current {@code Maybe}, then the {@code other} {@link MaybeSource}, one after