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https://github.com/deanwampler/seductionsofscalatutorial

An introduction to Scala and what makes it seductive. See also my SeductionsOfScala talk in my Presentations repo.
https://github.com/deanwampler/seductionsofscalatutorial
Last synced: 3 months ago
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An introduction to Scala and what makes it seductive. See also my SeductionsOfScala talk in my Presentations repo.
Host: GitHub
URL: https://github.com/deanwampler/seductionsofscalatutorial
Owner: deanwampler
License: apache-2.0
Created: 2013-08-31T19:41:00.000Z (over 11 years ago)
Default Branch: master
Last Pushed: 2013-09-26T19:01:37.000Z (about 11 years ago)
Last Synced: 2023-04-14T23:35:40.249Z (over 1 year ago)
Language: Scala
Size: 19.8 MB
Stars: 8
Watchers: 3
Forks: 3
Open Issues: 0
Metadata Files:
- Readme: README.html
- License: LICENSE
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      The Seductions of Scala Tutorial


Dean Wampler, Concurrent Thought


[email protected]


@deanwampler


Hire Me!


Copyright (c) 2009–2013, Dean Wampler under the Apache License; see the attached LICENSE file.


Introduction


This hands-on tutorial introduces you to the Scala programming language, a modern JVM language that provides a more concise syntax than Java, addresses some of the limitations of the Java object model, and adds full support for Functional Programming.


Setup


PDFs of the tutorial slides and all the exercise source code will be provided in class. You should also clone this GitHub repo in advance.


Either way, you’ll need to setup the following tools in advance.


Please do the following installation steps before the tutorial!


Git


You’ll need git if you want to clone the tutorial repository. See Getting Started Installing Git for details.


This Tutorial


Once git is installed, clone this tutorial from GitHub. Use your favorite Git GUI or the command line. Using bash:


cd $HOME/fun

git clone git://github.com/deanwampler/SeductionsOfScalaTutorial.git



On Windows:


cd C:\fun

git clone git://github.com/deanwampler/SeductionsOfScalaTutorial.git



Scala 2.10


At the time of this writing, version 2.10 is the latest available version of Scala. Even if you have 2.9.X, we’ll discuss some features new to 2.10, so I recommend installing it. I’ll indicate what features are new. However, most of the material works for 2.9.X.


Go to to the Scala download page and download the 2.10 installer for your platform. Also, download the API archive that appears in the same list of download links.


	NOTE

	Be sure to grab the installer for version 2.10 of Scala. However, most of the tutorial will apply to the current production release, 2.9.X.

Install Scala somewhere convenient. We’ll use $SCALA_HOME to refer to this location. Be sure to add $SCALA_HOME/bin to your PATH.


SBT


We will use the de-facto build tool for Scala, sbt, for some exercises and examples. See the sbt website for installation instructions. Actually, what you install is a driver Java programm. The actual version of sbt used will be bootstrapped for the project…


A Programmer’s Editor or IDE


You can use any editor you want, preferably one that supports Scala syntax highlighting. Most do these days, but you may need to install a Scala plugin for your favorite editor.


If you like using Eclipse, consider installing the Scala IDE. Be careful to pick to the version of the IDE for your version of Scala (e.g., 2.10) and the version of Eclipse you have (e.g., Indigo). IntelliJ IDEA also has good support for Scala. However, we won’t need IDE features for the tutorial exercises.


Sanity Check


Once Scala is installed, try running the REPL (Read, Eval, Print, Loop) to make sure everything is working. The commands you type outside the REPL (e.g., at the bash shell for Linux and Mac OS X) are shown with the $ prompt. The scala prompt is scala>. Everything else is output. Your version details my differ slightly.


$ scala

Welcome to Scala version 2.10.0 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0).

Type in expressions to have them evaluated.

Type :help for more information.

scala> :power

** Power User mode enabled - BEEP WHIR GYVE **

** :phase has been set to 'typer'.          **

** scala.tools.nsc._ has been imported      **

** global._, definitions._ also imported    **

** Try  :help, :vals, power.<tab>           **

scala> :help

All commands can be abbreviated, e.g. :he instead of :help.

Those marked with a * have more detailed help, e.g. :help imports.

:cp <path>                 add a jar or directory to the classpath

:help [command]            print this summary or command-specific help

:history [num]             show the history (optional num is commands to show)

:h? <string>               search the history

:imports [name name ...]   show import history, identifying sources of names

:implicits [-v]            show the implicits in scope

:javap <path|class>        disassemble a file or class name

:load <path>               load and interpret a Scala file

:paste                     enter paste mode: all input up to ctrl-D compiled together

:power                     enable power user mode

:quit                      exit the interpreter

:replay                    reset execution and replay all previous commands

:reset                     reset the repl to its initial state, forgetting all session entries

:sh <command line>         run a shell command (result is implicitly => List[String])

:silent                    disable/enable automatic printing of results

:type [-v] <expr>          display the type of an expression without evaluating it

:warnings                  show the suppressed warnings from the most recent line which had any

:phase <phase>             set the implicit phase for power commands

scala> ^D



I used control-d (^D) to exit. It’s an old terminal control, similar to ^C, that means “end of input”. It’s more “polite” than ^C…


The REPL commands that begin with a colon (:) are used for non-code directives, like turning on the useful “power” mode, viewing help, loading source files, etc.


Open the API in your browser.


It’s convenient to open the API documentation you downloaded in a browser. The Scaladocs are analogous to Javadocs. See also the References below.


That’s It!


You’re ready to go. 


I welcome feedback on the tutorial. See my contact information at the beginning of this file.


References


General Scala Resources



scala-lang.org

The main website for Scala.


Typesafe

The official developer of Scala and other components that are part of the Typesafe stack.


docs.scala-lang.org

Lots of documentation for Scala, including the Scaladocs tutorials, the Scala Improvement Process (SIP) proposals (for new features), etc.


akka.io

The website for the Akka distributed computing library that’s part of the Typesafe stack.


Play Framework

One of many web frameworks for Scala, this one is an official part of the Typesafe stack.


Programming Scala

The book I co-wrote with Alex Payne. It’s a bit dated, to be honest, but we have plans to update it soon. Links for other books can be found at scala-lang.org.



What’s New in Scala Version 2.10?


Here are two nice lists of the new features with links to more details:




http://ochsenreither.posterous.com/whats-new-in–210



http://scala-programming-language.1934581.n4.nabble.com/Scala–2–10–0-RC2-td4634084.html.



Specifically on Macros



Macros provide a hygienic macro facility, somewhat like Lisp and not like C or C++. It’s one of the most significant new features that promises to revolutionalize API and DSL development. It’s an evolving feature. The principle documentation is available here:




http://scalamacros.org



The following projects are using Macros. The first three are referenced on this scalamacros.org “getting started” page:




https://github.com/retronym/macrocosm

https://github.com/pniederw/expecty

http://slick.typesafe.com/

Play 2.1 JSON API: http://mandubian.com/2012/11/11/JSON-inception/





Slick


Slick is a type-safe, data-access API inspired by .NET’s LINQ.






http://slick.typesafe.com/.



Working Through the Tutorial


The slides are too long ;) So, we’ll skip through them, allowing us to spend most of our time on the actual exercises. The following sections list the slides we’ll actually look at in class. You might look at the skipped slides later for more background information.


SeductionsOfScala.pdf


Note that the solutions for the exercises are in the tutorial-exercises/solutions folder. Also, we do the first few together as a class, then you’ll work on your own.


	Slides

	Description

	Exercise

	Slides 14–26

	Succinct code

	1

	Slides 27–34

	Case classes

	2

	Slides 35–61

	Objects as functions, implicits, etc.

	3*

	Slides 78–86, 91

	Recursion

	4, 5 (on slide 107) for extra credit

	Slides 109–117

	Option type

	-

	Slides 121–122, 127–131

	For comprehensions

	6

	Slides 135–142

	Traits (“mixins”)

	-

	Slides 184–214

	Companion object, pattern matching

	8 (optional)



We’ll discuss the solution to Exercise 3, but not work through it (for time’s sake).



That is, we’ll cover about half the slides ;)


SeductionsOfScala-Applications.pdf


This section discusses two important applications of Scala.




The Akka Actor model for concurrency.

Scalding, a DSL for Hadoop.



We’ll just discuss Akka today.


	Slides

	Description

	Exercise

	Slides 4–22

	Akka and an example

	drawing-actors

The drawing-actors exercise is in its own directory. See tutorial-exercises/drawing-actors/README.html for details. It also demonstrates the use of sbt, the de-facto build tool for Scala and one of several test frameworks, ScalaTest.


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