It is possible to make it so that one
Observable instance won't begin its emissions until another emits, or so that it would emit only if another doesn't emit anything. These
Observable instances are able to emit items under given conditions, and these conditions are applied to them using conditional operators. In this section, we'll take a look at some of the conditional operators provided by RxJava.
amb() operator has overloads that take from two up to nine source
Observable instances or an
Iterable instance of the
Observable instances. It emits the items of the source
Observable instance that starts emitting first. It doesn't matter what this is, whether
OnCompleted notification, or data. ...