Scala for Java Developers
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
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
-
The Scala Language
-
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,whileandfor -
Breaking Control Flow (
breakandcontinue) - Exceptions
-
Generics
- Parametric Polymorphism
- Bounded Classes
- Variance
-
Classes and Fields
-
III. Beyond Java to Scala
-
Faking Function Calls
-
The
applyMethod -
The
updateMethod - Summary
-
The
-
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
flatMapwithOption - How For Comprehensions Work
- Finally, Using a For Comprehension for Shipping Labels
- Summary
-
Faking Function Calls
-
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
-
Adopting Scala
-
Appendices
-
Code Listings
- Inheritance
- Generics
- Pattern Matching
- Map
- Syntax Cheat Sheet
- Index
-
Code Listings
- Notes
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