Book Image

Learning Concurrent Programming in Scala - Second Edition

By : Aleksandar Prokopec
Book Image

Learning Concurrent Programming in Scala - Second Edition

By: Aleksandar Prokopec

Overview of this book

Scala is a modern, multiparadigm programming language designed to express common programming patterns in a concise, elegant, and type-safe way. Scala smoothly integrates the features of object-oriented and functional languages. In this second edition, you will find updated coverage of the Scala 2.12 platform. The Scala 2.12 series targets Java 8 and requires it for execution. The book starts by introducing you to the foundations of concurrent programming on the JVM, outlining the basics of the Java Memory Model, and then shows some of the classic building blocks of concurrency, such as the atomic variables, thread pools, and concurrent data structures, along with the caveats of traditional concurrency. The book then walks you through different high-level concurrency abstractions, each tailored toward a specific class of programming tasks, while touching on the latest advancements of async programming capabilities of Scala. It also covers some useful patterns and idioms to use with the techniques described. Finally, the book presents an overview of when to use which concurrency library and demonstrates how they all work together, and then presents new exciting approaches to building concurrent and distributed systems. Who this book is written for If you are a Scala programmer with no prior knowledge of concurrent programming, or seeking to broaden your existing knowledge about concurrency, this book is for you. Basic knowledge of the Scala programming language will be helpful.
Table of Contents (19 chapters)
Learning Concurrent Programming in Scala - Second Edition
About the Author
About the Reviewers
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Scala collections in a nutshell

The Scala collections module is a package in the Scala standard library that contains a variety of general-purpose collection types. Scala collections provide a general and easy-to-use way of declaratively manipulating data using functional combinators. For example, in the following program, we use the filter combinator on a range of numbers to return a sequence of palindromes between 0 and 100,000; that is, numbers that are read in the same way in both the forward and reverse direction:

(0 until 100000).filter(x => x.toString == x.toString.reverse) 

Scala collections define three basic types of collections: sequences, maps, and sets. Elements stored in sequences are ordered and can be retrieved using the apply method and an integer index. Maps store key-value pairs and can be used to retrieve a value associated with a specific key. Sets can be used to test the element membership with the apply method.

The Scala collection library makes a distinction...