Pilquist Michael, Bjarnason Rúnar, Chiusano Paul. Functional Programming in Scala

2nd Edition. — Manning Publications, 2023. — 448 p.This international bestseller has been revised with new exercises, annotations, and full coverage of Scala 3.In Functional Programming in Scala, Second Edition you will learn how to:
Recognize and write purely functional code.
Work with errors without using exceptions.
Work with state and concurrency.
Interact with functional structures that define common behaviors.
Write code that performs I/O without sacrificing functional programming.Functional Programming in Scala has helped over 30,000 developers discover the power of functional programming. You’ll soon see why reviewers have called it “mindblowing”! The book smooths the complexity curve of functional programming, making it simple to understand the basics and intuitive to progress to more advanced topics. Concrete examples and exercises show you FP in the real world and reveal how it can improve your everyday coding practices. This second edition comes packed with the latest standards of FP, as well as full code updates to Scala 3, and its new language features.About the TechnologyFunctional code is easy to test, reuse, and parallelize, and it’s practically immune to whole categories of state-related bugs. With its strong functional features, familiar syntax, and seamless interoperability with Java, there’s no better place to start learning functional programming than the flexible Scala language.Functional programming (FP) is based on a simple premise with far-reaching implications: we construct our programs using only pure functions — in other words, functions that have no side effects. But what are the side effects? A function has a side effect if it does something other than simply return a result. This includes, for example, the following cases:Modifying a variable.
Modifying a data structure in place.
Setting a field on an object.
Throwing an exception or halting with an error.
Printing to the console or reading user input.
Reading from or writing to a file.
Drawing on the screen.About the BookIn Functional Programming in Scala, Second Edition you’ll learn functional programming from first principles. Hands-on exercises and examples make it easy to start thinking and coding functionally. This revised edition contains extensive exercise annotations to help you explore FP in-depth, along with steps to build your functional libraries in Scala. Once the functional lightbulb goes on, you’ll never look at coding the same way again.What's InsideRecognize and write purely functional code.
Work with errors without using exceptions.
Work with state and concurrency.
Interact with functional structures that define common behaviors.