flat Map
Calls the mapper with the value emitted by the Single and subscribes to the returned inner Single. Emits the value from the inner Single.
Please refer to the corresponding RxJava document.
Calls the mapper with the value emitted by the Single and subscribes to the returned inner Single. When the inner Single emits, calls the resultSelector function with the original and the inner values and emits the result.
Please refer to the corresponding RxJava document.