Scala cookbook recipes

Wow, I began by writing a few Scala programming tutorials just because I like the language, and as I look here a couple of months later I now have more than sixty tutorials. As a result, I thought I'd start organizing them here in the form a Scala Programming Cookbook.

Here's my current collection of Scala FAQs and recipes, in a "cookbook" format.

General Scala programming recipes

• A Scala cheat sheet (reference page)
• A Scala current date and time example
• Scala if then else syntax
• Scala multiline Strings and heredoc syntax
• Scala ternary operator syntax
• Scala for loop and yield examples (a 'yield' tutorial)
• The C# style (curly brace) package syntax in Scala
• How to add new methods to existing classes in Scala

Scala classes and methods

• Creating JavaBeans classes in Scala
• Importing Java classes and packages into a Scala program
• How to create multiple class constructors in Scala
• Scala functions - named arguments and default arguments
• Scala methods - dots, spaces, and parentheses
• A Scala class casting example
• Scala equivalent of Java .class (classOf)
• How to rename classes when you import them in Scala
• How to create a private default/primary constructor

Scala try/catch/finally block examples

• Scala try, catch, and finally syntax
• How to declare a null var before a try/catch block

Scala collection recipes

Scala Array examples:

• Mutable Scala arrays
• Scala String array examples
• Convert a Scala array to a String with mkString
• Scala data types
• Converting Java collections to Scala collections
• How to create and use a multidimensional array (2D array) in Scala

Scala List examples:

• Iterating over Scala Lists with foreach and for
• How to merge Scala Lists
• Five ways to create a Scala List
• Scala List class examples
• How to add elements to a List in Scala
• How to use the Scala List class filter method

Scala Map examples:

• Scala Map class examples
• Iterating over Scala Maps

Iterating and looping over Scala collections:

• Iterating over Scala Lists with foreach and for
• Iterating over Scala Maps
• Convert a Scala array to a String with mkString

Scala tuples:

• Scala tuple examples
• Using Map tuples in an anonymous function

Using Scala parallel programming methods and classes:

• Scala parallel programming, parallel collections, .par, and Scala collections performance

Scala String recipes

• Scala String array examples
• Scala String formatting (like Java String.format)
• Convert a Scala array to a String with mkString
• A Scala split string example
• Scala multiline Strings and heredoc syntax
• How to convert a String to Int in Scala
• In Scala you compare two Strings with '==', not equals()
• A Scala String chomp method

Functions and functional programming recipes

• Scala functions - named arguments and default arguments
• Passing one function to another function as a function argument
• Passing a function to a function (Swing example)

Scala web development recipes

• Scala Lift Framework form tutorials, examples
• A Scala Spring Framework dependency injection example
• A Scala JSON example, using Lift-JSON

Scala email recipes

• A simple Scala IMAP client (using SSL and IMAPS)
• A Scala IMAP client with search capability (SearchTerm, AndTerm)

Scala database recipes

• Scala JDBC connection and SQL SELECT example

Scala file read, write, input/output recipes

• How to open and read files in Scala
• A Scala shell script example

Scala command line and script recipes

• Reading Scala command line arguments
• How to execute (exec) system commands in Scala
• Scala shell scripts - Prompting a user and reading their input
• How to make your Scala scripts run faster by compiling them to jar files
• How to show String and StringOps methods in the Scala REPL
• How to show more methods on classes/objects in the Scala REPL
• How to enter or paste multiline commands in the Scala REPL

Web service recipes

• A Scala REST client using Apache HttpClient library
• A Scala Twitter client example
• A Scala JSON parsing example, using Lift-JSON
• A Scala JSON array parsing example, using Lift-JSON

Scala XML recipes

• Scala XML - searching XMLNS namespaces, XPath, and more
• How to load an XML file in Scala (open and read the XML file)
• How to load an XML URL in Scala (RSS feed, RESTful web service, or other)
• A collection of Scala XML examples (creating XML literals, multiline literals, XPath searching)

Scala build, testing, and debugging recipes

• How to run ScalaTest unit tests in Eclipse
• The Scala SBT documentation in PDF format
• How to show your SBT history (history of SBT commands)

Scala Actors and concurrency

• How to stop/quit a Scala Actor
• Simple Scala Akka Actor 'Hello, World' examples
• A Simple Akka actors 'ping pong' example
• How to stop an Akka actor and shut down the Akka actor system
• A simple Akka Futures example (calculating 1+1 concurrently)
• An Akka actors "ask" example (ask, future, await, timeout)

Scala programming idioms

• Using Scala's Option, Some, and None idiom
• Scala idiom - Methods should have no side effects
• Scala idiom - Prefer immutable code
• More coming soon ...

Example algorithms

• A Scala Adler-32 checksum algorithm
• A Scala 'Collective Intelligence' Euclidean algorithm

Scala cookbook recipes - summary

As mentioned, I'm just putting this collection of Scala programming recipes out here today, and I'll try to clean up and organize them in the coming days.