GraphViz DOT Parser - Shows how to construct a parser for the DOT language with Scala’s combinator parsers

AOP Style Security Check - Using Scala’s implicit values and coercions to do AOP-like security checks

Subversion Fast Update - Using Scala’s XML to parse and work with subversion ouput

XML Pattern Matching - Using Scala’s pattern matching with XML

As-Patterns - A minor, yet useful, feature of Scala’s pattern matching

Automata - Calling Scala’s automata library

Arrows - Recreating Hughes’ arrows in Scala

Verbatim filter - Using Scala’s pattern matching for filtering LaTeX files to pretty-print Scala code

Constructors - implementing constructors with additional computations

Design By Contract - Implementing design by contract require and ensure

Automatic Differentiation - Using implicit conversions

Probabilistic Modeling - Implementing a probability monad

Step 1 - An example that should be understandable for Java and Ruby programmers alike

Step 2 - A few functional concepts like immutable objects and Actors

Particle swarm optimization - Putting basic Scala constructs together in an example of biologically inspired optimization

Shared Objects

Futures - Lazy evaluation, concurrent evaluation, etc.

Finger Trees - Immutable, functional sequences

Alternate Lazy Values - A different, probably faster implementation of laziness

Software Transactional Memory - serializable updates, with blocking and choice

Mini Kanren

JAXB schemagen - Annotate a Scala class to get an XML Schema from JAXB

Wrapping JMX - One technique for wrapping JMX

Defining Bean Properties - stop writing those setX(...) and getX() methods

Hello Swing - Tiny ‘Hello World’ program using swing

Basic Web Applet - Simple Scala web-applet, with Java version for comparison.

JUnit Tests - using the JUnit test framework for Scala code

Simplifying JDBC - Scala’s smart type system and shorthands make it easy

ScalaGUI - A Scala framework wrapping Swing. It uses event loops to solve the inversion-of-control problem of Swing’s callback events. It uses multiple-inheritance for clean composition of widget properties.

Integrating with Jaxen - Implements a Jaxen Navigator so XPath expressions can easily be used to navigate through Scala objects.

Compressed Executable JAR - A quick program that can compress a Scala app and the runtime library together.

Sudoku Solver - Using Scala to write a brute-force succinct Sudoku Solver

General Problem Solver (GPS) - Using Scala to implement a (not so) General Problem Solver

Literate Programs - A wiki site that wants to present algorithms in different programming languages.

Book examples - “Structure and Interpretation of Computer Programs” (Hal Abelson, Jerry Sussman and Julie Sussman, MIT Press) examples in Scala and other p.l.