Get Programming with Scala

28 Working with List: map and flatMap

After reading this lesson, you will be able to

• Transform the elements of a sequence using the map function
• Simplify a nested structure using the flatten method
• Manipulate and combine lists using the flatMap operation
• Chain instances of List using for-comprehension

In the previous lesson, you learned the basics of the type List of the Scala standard collection library. In this lesson, you’ll learn about the basic operations you can perform on lists similar to those you have seen for the class Option. You will see how to use the map operation to apply a function to a sequence’s elements, unify nested lists using flatten, and chain them together using flatMap. You’ll learn how to use for-comprehension to ...