Book Image

Learn Scala Programming

By : Slava Schmidt
Book Image

Learn Scala Programming

By: Slava Schmidt

Overview of this book

The second version of Scala has undergone multiple changes to support features and library implementations. Scala 2.13, with its main focus on modularizing the standard library and simplifying collections, brings with it a host of updates. Learn Scala Programming addresses both technical and architectural changes to the redesigned standard library and collections, along with covering in-depth type systems and first-level support for functions. You will discover how to leverage implicits as a primary mechanism for building type classes and look at different ways to test Scala code. You will also learn about abstract building blocks used in functional programming, giving you sufficient understanding to pick and use any existing functional programming library out there. In the concluding chapters, you will explore reactive programming by covering the Akka framework and reactive streams. By the end of this book, you will have built microservices and learned to implement them with the Scala and Lagom framework.
Table of Contents (19 chapters)


  1. How do you map an endpoint with a query parameter to a REST call?
  2. What is the recommended serialization format for persistent entities?
  3. Can you explain why clustering is required in order to use persistence in Lagom?
  4. Describe one possible data model which could be used to make the Manager a persistent entity.
  5. Outline an alternative way to implement the Baker service.
  6. Can you identify a design bug in current implementation of the Chef?
  7. The Manager implementation stores a number of cookies in memory and this number will be lost at the moment the service restarts. Can you name another reason why it is a bad idea to hold the number of cookies in a local variable?