Mastering Advanced Scala
Mastering Advanced Scala
Exploring the deep end of functional programming
About the Book
In this book, you will learn how to utilize type classes for implementing ad-hoc polymorphism and discover why category theory abstractions are useful in real-life programming. A substantial part of the book is devoted to the overview of exisitng purely functional libraries such as Cats, Shapeless and ScalaZ where we discuss what concepts they are built on and how you can apply them to improve your code. The book also explores some less known concepts such as iteratees and optics.
Who this book is for
This book is intended for people who already know how to write applications in Scala but want to know more. If you are only starting out, I would recommend you start with my other book "Modern Web Development with Scala".
Which versions are used
The book is periodically updated to use the most relevant versions of the libraries. Check out the book's GitHub repository for details.
My special thanks go to Julien Truffaut and Alexandru Nedelcu for their valuable feedback on the Monocle and Monix chapters, repectively. Also, the cover illustration was designed by Freepik.
Advanced language features
- Implicit parameters
- Implicit conversions
- Type erasure and type tags
- Existential types
- Type classes
- Using Simulacrum
- ScalaZ disjunctions
- ScalaZ Task
- ScalaZ Actor
- Monad transformers
- Free monads
Dealing with side effects
- The standard Future
- The ScalaZ Task
- The Cats IO monad
- Thread shifting
- Iteratees, enumeratees and enumerators
- Building simple transformations
- Using iteratees with Eval
- Analyzing texts with iteratees
Working with asynchronous code
- Using Monix
- Monix Task
Lenses and other optics
- Pure streams
- Effectful streams
- Pipes and sinks
- Text processing with streams
Working with JSON
- Using Circe
- Parsing and navigating
Generic programming with Shapeless
- The Aux technique
- HList operations
- Product types
- Generic codec derivation
- Abstracting over arity
Purely functional HTTP services
- HTTP server as a pure function
Database access with doobie
- Simple queries
- Selecting multiple columns
- Using connection pools
- Closing remarks
- Appendix A. Source code
- Appendix B. References
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