Scala Book

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Scala traits are a great feature of the language. As you’ll see in the following lessons, you can use them just like a Java interface, and you can also use them like abstract classes that have real methods. Scala classes can also extend and "mix in" multiple traits.

Scala also has the concept of an abstract class, and we’ll show when you should use an abstract class instead of a trait.

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Contributors to this page:

• Introduction
• Prelude꞉ A Taste of Scala
• Preliminaries
• Scala Features
• Hello, World
• Hello, World - Version 2
• The Scala REPL
• Two Types of Variables
• The Type is Optional
• A Few Built-In Types
• Two Notes About Strings
• Command-Line I/O
• Control Structures
• The if/then/else Construct
• for Loops
• for Expressions
• match Expressions
• try/catch/finally Expressions
• Scala Classes
• Auxiliary Class Constructors
• Supplying Default Values for Constructor Parameters
• A First Look at Scala Methods
• Enumerations (and a Complete Pizza Class)
• Scala Traits and Abstract Classes
• Using Scala Traits as Interfaces
• Using Scala Traits Like Abstract Classes
• Abstract Classes
• Scala Collections
• The ArrayBuffer Class
• The List Class
• The Vector Class
• The Map Class
• The Set Class
• Anonymous Functions
• Common Sequence Methods
• Common Map Methods
• A Few Miscellaneous Items
• Tuples
• An OOP Example
• sbt and ScalaTest
• The most used scala build tool (sbt)
• Using ScalaTest with sbt
• Writing BDD Style Tests with ScalaTest and sbt
• Functional Programming
• Pure Functions
• Passing Functions Around
• No Null Values
• Companion Objects
• Case Classes
• Case Objects
• Functional Error Handling in Scala
• Concurrency
• Scala Futures
• Where To Go Next

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