If your application source code is overly verbose, it can be a nightmare to maintain. Write concise and expressive, type-safe code in an environment that lets you build for the JVM, browser, and more. Key Features Expert guidance that shows you to efficiently use both object-oriented and functional programming techniques Understand functional programming libraries, such as Cats and Scalaz, and use them to augment your Scala development Perfectly balances theory and hands-on exercises, assessments, and activities Book Description This book teaches you how to build and contribute to Scala programs, recognizing common patterns and techniques used with the language. You'll learn how to write concise, functional code with Scala. After an introduction to core concepts, syntax, and writing example applications with scalac, you'll learn about the Scala Collections API and how the language handles type safety via static types out-of-the-box. You'll then learn about advanced functional programming patterns, and how you can write your own Domain Specific Languages (DSLs). By the end of the book, you'll be equipped with the skills you need to successfully build smart, efficient applications in Scala that can be compiled to the JVM. What you will learn Understand the key language syntax and core concepts for application development Master the type system to create scalable type-safe applications while cutting down your time spent debugging Understand how you can work with advanced data structures via built-in features such as the Collections library Use classes, objects, and traits to transform a trivial chatbot program into a useful assistant Understand what are pure functions, immutability, and higher-order functions Recognize and implement popular functional programming design patterns Who this book is for This is an ideal book for developers who are looking to learn Scala, and is particularly well suited for Java developers looking to migrate across to Scala for application development on the JVM. Downloading the example code for this book You can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have the files e-mailed directly to you Contents......Page 3 Preface......Page 9 Set up the Environment......Page 15 Simple Program......Page 17 Structure of Scala Project......Page 20 Base Syntax......Page 26 Unit Testing......Page 30 Basic Language Features......Page 38 Objects, Classes & Traits......Page 39 OO in our Chatbot......Page 51 Function Calls......Page 58 Functions......Page 65 Functions......Page 66 Exploring Pattern Matching......Page 72 Partial Functions in Practice......Page 76 Scala Collections......Page 83 Lists......Page 84 Abstracting on Sequences......Page 89 Other Collections......Page 93 Scala Type System......Page 98 Type Basics & Polymorphism......Page 99 Variance......Page 104 Advanced Types......Page 108 Implicits......Page 113 Implicit Parameters & Conversions......Page 114 Ad Hoc Polymorphism & Type Classes......Page 118 Functional Idioms......Page 122 Intro to Functional Programming Concepts......Page 123 Functional Design Patterns......Page 128 Popular Libraries......Page 135 Domain Specific Languages......Page 146 DSLs and Types of DSLs......Page 147 ScalaTest – Popular DSL......Page 148 Language Features for Writing DSLs......Page 154 Writing small DSL......Page 156 Beyond this Book......Page 161 Index......Page 168
