Scala for Java Developers


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Scala for Java Developers

A Practical Primer

About the Book

Scala is a concise, statically typed scripting language that runs on the Java Virtual Machine. It is both a functional programming language and object-oriented language but its emphasis on functional programming sets it apart from Java.

Learn Scala: A Practical Primer for Java Developers is for Java developers looking to transition to programming Scala. The book will help you translate the Java you already know into Scala and kick-start your productivity.

What's Inside

  • Tour Scala and learn the basic syntax, constructs and how to use the REPL
  • Translate Java syntax that you already know into Scala
  • Learn what Scala offers over and above Java, functional programming concepts and idioms
  • Tips and advice useful when transitioning existing Java projects to Scala

Paperback now available on Amazon.

About the Author

Toby Weston
Toby Weston

Toby is an independent consultant based in London. He specialises in agile enablement, training and modern software development.

Table of Contents

    • Prologue
    • Preface
  • I. Scala Tour
    • The Scala Language
      • As a Functional Programming Language
      • The Past
      • The Future
    • Installing Scala
      • The Scala Interpreter
      • Scala Scripts
      • scalac
    • Some Basic Syntax
      • Defining Values and Variables
      • Defining Functions
      • Operator Overloading and Infix Notation
      • Collections
      • Tuples
      • Java Interoperability
      • Primitive Types
    • Scala’s Class Hierarchy
      • AnyVal
      • Unit
      • AnyRef
      • Bottom Types
    • ScalaDoc
    • Language Features
      • Working with Source Code
      • Working with Methods
      • Functional Programming
    • Summary
  • II. Key Syntactical Differences
    • Classes and Fields
      • Creating Classes
      • Derived Setters and Getters
      • Redefining Setters and Getters
      • Summary
    • Classes and Objects
      • Classes Without Constructor Arguments
      • Additional Constructors
      • Singleton Objects
      • Companion Objects
    • Classes and Functions
      • Anonymous Functions
      • Anonymous Classes
      • First-class Functions
      • Function Types
      • Functions vs. Methods
      • Lambdas vs. Closures
    • Inheritance
      • Subtype Inheritance
      • Anonymous Classes
      • Interfaces / Traits
      • Abstract Classes
      • Polymorphism
      • Deciding Between the Options
    • Control Structures
      • Conditionals
      • Looping Structures: do, while and for
      • Breaking Control Flow (break and continue)
      • Exceptions
    • Generics
      • Parametric Polymorphism
      • Bounded Classes
      • Variance
  • III. Beyond Java to Scala
    • Faking Function Calls
      • The apply Method
      • The update Method
      • Summary
    • Faking Language Constructs
      • Curly Braces (and Function Literals)
      • Currying
      • Summary
    • Pattern Matching
      • Switching
      • Patterns
      • Literal Matches
      • Constructor Matches
      • Type Query
      • Deconstruction Matches and unapply
      • Guard Conditions
    • Map and FlatMap
      • Mapping Functions
      • FlatMap
      • Not Just for Collections
    • Monads
      • Basic Definition
      • Option
      • More Formal Definition
      • Summary
    • For Comprehensions
      • Where We Left Off
      • Using Null Checks
      • Using flatMap with Option
      • How For Comprehensions Work
      • Finally, Using a For Comprehension for Shipping Labels
      • Summary
  • IV. Adopting Scala in Java Teams
    • Adopting Scala
      • Avoid Not Enough
      • Don’t Do Too Much
      • Purely Functional FTW?
    • What to Expect
      • The Learning Curve
      • The Learning Continuum
    • Tips
      • Be Clear
      • Get Guidance
      • Have a Plan
    • Convert Your Codebase
    • Manage Your Codebase
      • Conventions
      • What to Avoid
      • Other Challenges
  • Appendices
    • Code Listings
      • Inheritance
      • Generics
      • Pattern Matching
      • Map
    • Syntax Cheat Sheet
    • Index
  • Notes

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