RxJava quiz

Test your RxJava knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What is RxJava commonly used for on Android, especially before Kotlin coroutines became widely adopted?

1. What is RxJava commonly used for on Android, especially before Kotlin coroutines became widely adopted?
2. What is the purpose of RxJava operators like `map`, `filter`, and `flatMap`?
3. What is backpressure, and why does RxJava introduce `Flowable` (alongside `Observable`) to address it?
4. What is the difference between a "hot" and a "cold" Observable in RxJava?
5. What does `Completable` represent in RxJava, and what is a typical use case?
6. What is the purpose of the `debounce` operator in RxJava, and what is a typical use case?
7. What is a `Single` in RxJava, and how does it differ from an `Observable`?
8. What are the three main types of notifications an RxJava `Observable` can emit to its subscribers?
9. Why is it considered important to dispose of RxJava subscriptions (e.g. via a `CompositeDisposable`) when a component (like an Android Activity or Fragment) is destroyed?
10. How do Kotlin coroutines (with Flow) compare to RxJava as an approach to asynchronous/reactive programming on the JVM/Android?
11. What is the core abstraction RxJava is built around?
12. What does the `flatMap` operator specifically do that `map` does not?

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