Toby Weston - Learn Scala for Java Developers [2015, AZW3/EPUB/PDF, ENG]

Table of Contents

Preface

I. Scala Tour The Scala Language Pure Functions
Higher-Order Functions
Scala’s Background
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
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

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

Syntax Cheat Sheet
Index