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In RX you work with an Observable<T> which behaves quite like a Collection<T> in Java 8 so you can filter/map/concat and so forth. The Observable<T> then acts as a typesafe composable API for working with asynchronous events in a collection-like way.

Once you have an Observable<T> you can then

• filter events
• transform events
• combine event streams
• other utility methods

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