Get Programming with Scala

44 Working with Future: map and flatMap

After reading this lesson, you will be able to

• Manipulate the result of an asynchronous computation using the map operation
• Merge two nested asynchronous computations using the flatten method
• Combine multiple asynchronous operations using the flatMap function

In the previous lesson, you learned the basics of expressing asynchronous computations using the type Future. In this lesson, you’ll learn how to use the methods map, flatten, and flatMap for an instance of Future. You’ll notice that they share many commonalities with the map, flatten, and flatMap methods you have mastered for other types. The map function allows you to transform the value that an asynchronous computation produces. The flatten ...