There are quite a few very good Scala books in the market today. The book I have written has the following
intent and focus:
My main focus in this book is to help an experienced Java developer learn the essentials of
Scala so that he/she can become productive fairly quickly to write concurrent applications using it.
To this effect, I take the reader quickly through the main concepts like closures, how to write
classes, how things are similar and where they differ from Java, how to use collections, traits,
and pattern matching. Then I show how Scala alleviates the problems in multithreading and show
how to program using actors. You will learn how to create and use actors and when to use react vs. receive.
In the final chapter I create a single threaded application and then evolve it in a few steps into a concurrent
application, providing the reasons for the steps taken.