```Completable.fromCallable { someBackgroundTask...

# rx

[Brendan Weinstein]

Completable.fromCallable {
  someBackgroundTaskA.blockingGet()
  someBackgroundTaskB.blockingGet()
}.applySchedulers().subscribe(onError = { })

vs

someBackgroundTaskA.flatMap { someBackgroundTaskB }
 .applySchedulers().subscribe(onError = { })

would be an example