Java Reactive: Test Your FlatMap Knowledge

What is the primary purpose of reactive data flow manipulation?

• To limit the number of threads in an application

• To process and work with data efficiently

• To enhance graphical user interfaces

• To create static data structures

Which operation is used to change the structure of data in a stream?

• Filter

• Transform

• Sort

• Distinct

What does the 'filter' operation do in a stream?

• It limits the number of elements

• It sorts the elements

• It selects elements based on criteria

• It maps elements to new values

Which of the following is NOT an intermediate operation in Java Streams?

• map

• distinct

• collect

• filter

What does the 'flatMap' operation do?

• It sorts the elements in a stream

• It limits the number of elements in a stream

• It filters elements based on a predicate

• It flattens nested streams into a single stream

What is 'deferred execution' in Java?

• Execution of code in a synchronous manner

• Execution of code at a later time

• Execution of code in a separate thread

• Execution of code immediately

What does the 'defer' function in ReactiveX do?

• Creates an Observable immediately

• Defers the creation of an Observable until subscription

• Executes code synchronously

• Limits the number of emissions from an Observable

What is the purpose of the 'Callable' interface in Java?

• To manage user input

• To handle exceptions in synchronous code

• To create static methods

• To define tasks that can be executed concurrently

What does 'Single.fromCallable' do in RxJava?

• Sorts elements in a stream

• Filters elements from a stream

• Creates a new thread for execution

• Converts a function into a Single observable

Which method is used to limit the size of a stream?

• distinct

• filter

• limit

• map