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)


Property-based testing is a supplementary technique to the traditional unit testing and behavior-driven development. It allows one to describe program properties in the form of an abstract specification, and the test data in the form of rules to apply for its generation.

Properly generated data includes edge cases, which are often ignored during example-based testing, and allows for higher code coverage.

The ScalaCheck is a framework for property-based testing with Scala. It has three main components—properties, generators, and shrinkers.

Universally quantified properties must hold for any test data in any state of the program. Conditional properties are defined for some subset of the data or specific states of the system.

ScalaCheck provides a lots of generators for standard types out of the box. The best way to create generators for custom types is by combining...