Reactive Programming on Android with RxJava_468 x 60 copy 2.png

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RxJava

Since its inception in 2012, RxJava has slowly gained in popularity for enabling reactive programming on Android. It is now deemed as the go-to and leading reactive library. Many companies have adopted the reactive way of programming, including Google, with its release of Android Architecture Components, which has many reactive elements in its design.

In this course, you will learn the fundamental principles of RxJava which will serve as a foundation for experienced Android developers who are new to the library and want to start integrating it into their apps.

Reactive Programming with RxJava

Which of the following blocking operators should replace `X` in the code below?
```java
Observable<Long> source = Observable.interval(1, TimeUnit.SECONDS).take(10);; 
Iterable<Long> iter = source.X; 
for (Long i: iter) {System.out.println(i);}
```

Which of the following blocking operators should replace <code>X</code> in the code below?
<pre><code class="language-java">Observable&lt;Long&gt; source = Observable.interval(1, TimeUnit.SECONDS).take(10);; 
Iterable&lt;Long&gt; iter = source.X; 
for (Long i: iter) {System.out.println(i);}
</code></pre>

**(True or False)** In RxJava, data is pulled rather than pushed. 

(True or False) In RxJava, data is pulled rather than pushed.

What is the output of the code below?
```java
Completable.fromSingle(Single.just(1)).subscribe(() -> System.out.println("Done"));
```

What is the output of the code below?
<pre><code class="language-java">Completable.fromSingle(Single.just(1)).subscribe(() -&gt; System.out.println(&quot;Done&quot;));
</code></pre>

**(Select all that apply.)** Which of the following can be replaced by an `Observable`?

(Select all that apply.) Which of the following can be replaced by an <code>Observable</code>?

Consider the following example:
```java
public List<User> getUsersWithBlogs() {
 return Observable.fromIterable(UserCache.getAllUsers())
 .filter(user -> user.blog != null && !user.blog.isEmpty())
 .sorted((user1, user2) -> user1.name.compareTo(user2.name))
 .toList()
 .blockingGet();
}
```
What does the `.toList()` operator return on an `Observable`?

Consider the following example:
<pre><code class="language-java">public List&lt;User&gt; getUsersWithBlogs() {
 return Observable.fromIterable(UserCache.getAllUsers())
 .filter(user -&gt; user.blog != null &amp;&amp; !user.blog.isEmpty())
 .sorted((user1, user2) -&gt; user1.name.compareTo(user2.name))
 .toList()
 .blockingGet();
}
</code></pre>
What does the <code>.toList()</code> operator return on an <code>Observable</code>?

 Take this quiz to test how well you have grasped the concepts of reactive modeling.

Quiz

Take this quiz to test how well you have grasped the concepts of reactive modeling.

Getting Started

Part 1: RxJava Basics

Reactive Programming

RxJava Core Components

Operators

Multithreading

Part 2: RxJava Advanced

Reactive Modeling on Android

Backpressure

Error Handling

Conclusion

Quiz