Ruby Loves Dot Net

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IMHO Best IDE on the marketShared dynamic subsystemStandard hosting environmentBased on passing messages to objectsFull access to the CLREnable fast generation of dynamic codeOne true objectExplain how Jython was implemented and how it relates to the DLR

Here’s a list of the different implementations of ruby right now. • MRI stands for ‘Matz’s Ruby Interpreter’ - Matz is yukihiromatsumoto, a japanese guy who ﬁrst created the ruby language back in 1993. It’s written in straight C. This what you get when you go to the official ruby website. • JRuby is an implementation of Ruby running on the JVM - it interops natively with java. Commercially backed by sun. • MacRuby is Ruby running on Apple’s Objective C runtime. It interops natively with ObjectiveC, which makes it ideal for writing OSX GUI applications. It’s in it’s early stages, commercially backed by apple. • IronRuby is microsoft’s version. Commercially backed by microsoft who employ full time staff working on it. This is what our presentation is about • Rubinius is a an implementation of Ruby running using a C++ Virtual machine. Commercially backed by engineyard, one of the biggest ruby on rails web hosting companies.• Maglev is by GemStone, who are a smalltalk company. They’ve been around for years and years writing big enterprise systems using smalltalk. Maglev is their project to run ruby on their smalltalk VM • Hotruby is a small open source thing which compiles ruby into javascript. Sounds ridiculous but people have run this using the V8 engine in Google Chrome and it actually works out to be faster than the other ruby implementations for whatever set of benchmarks they were running All these companies are putting some serious resources behind getting ruby to run on the systems they want. This is evidence that there must be SOMETHING to it.

Many people that come to Ruby do so through the Rails framework.And then often you can hear these people say:I came for Rails but I stayed for Ruby

Ruby is a pleasant language to work with, partly because its well-chosen keywords, but mostly because it represents a kind of best breed implementation of a programming language. One of the goals ruby tries to achieve is to make the language you use ,when you’re writing your algorithms, a lot like a natural language. For example ruby has both the keywords if and unless, and you can apply those in 2 different ways. Best of breed Duck typing Everything is an object Classes are open / monkey patching Flexible Functional Procedural meta programming

Show some of the nicer ruby syntax

Regular expression literals [PERL] Strong text processing support [PERL] Blocks [SMALLTALK]Iterators [SMALLTALK]

Introduce blocksExplain about message receivers and message passingNote the string interpolation

Get into dynamic typing before duck typingRuby cares about typesIt cares about hierarchy + mixins when doing method lookupOnly safe operations against an object (no magic)Conversions explicit stepYou can override operators to allow for implicit conversion => explicit step + you’re in controlExplain how static typing resembles aristocracy with their bloodlines and how heritage is more important than capabilitiesExplain how duck typing focusses on the abilities of objects instead of their type. If the method is there it’s all good

Variables can change type =>sacreligion!We care about the size method on the receiver in get_count=> 1 reason type checking defferred to last responsible moment

metaprogramming == program to modify itself at runtime. metaprogramming == defining methods on instances and classes at runtime. You could very well generate most of a program at runtimeMostly used when DATA DRIVES THE CODE

Responding to unknown methods: method_missing Define methods programmatically String evaluation

See demos/metaprogramming.rbShow txt file content firstShow result of scriptOpen script start at bottomWalk through implementation

You can run ‘irb’ and just type some ruby code, and it runs as you go. This is a killer feature for when you’re testing, or when you’re learning a new API. I used to have to miss that when I was in .NET but that is a thing from the past now.

Require ‘mscorlib’Include System (equivalent of using in C#)Puts System.constantsPuts System.constants.grep(/^[A-C]/)

A class is a an object => class itself Nil => objectConstants => object

>>> 0.zero?=> true>>> 5.zero?=> false>>> 120/6=> 20>>> 873.class=> Fixnum>>> (1000 ** 1000).class=> Bignum >>> a = nil=> nil>>> a.nil?=> true>>> a.class=> NilClass

With great power comes great responsibility.You can extend classes at runtime and make api’s more wrist or read friendly

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Ruby Loves Dot Net - Presentation Transcript

Ruby <3 .NET
Ivan Porto Carrero
http://flanders.co.nz
http://twitter.com/casualjim
www.visug.be
Upcoming sessions
June 18 : Domain Driven Design (Yves Goeleven)
June 30 : IronRuby (Ivan Porto Carrero)
September 10 : ORMs, NHibernate – Entity Framework
(Davy Brion, Kurt Claeys)
Week of October 5 (TBD) : Dino Esposito
November 18 : Modeling with VSTS2010 (Marcel De Vries)
November 26 : RIA Services (Miguel De Lathouwer
& Steven Van Den Eynde)
The plan
CLR, DLR, WTF??
All ur Rubyz are now belongs to us
Ruby why should I care?
Gotcha’s
BDD with Bacon and Caricature
Sinatra has not left the building
IronRuby MVC
Ruby + Silverlight == Teh cake
CLR as we knew it
VB.NET
…
C#
Base Class Libraries
Common Type system
Security
Class Loader, GC, JIT, Execution Support
CLR but mo betterer
VB.NET
IronPython
C#
Base Class Libraries
DLR Runtime
Common Type system
Security
Class Loader, GC, JIT, Execution Support
All urRubyz are now…
MRI ‐ “The Normal” Ruby
JRuby ‐ Sun
MacRuby ‐ Apple
IronRuby ‐ Microsoft
Rubinius ‐ EngineYard
MagLev ‐ Gemstone
HotRuby
All urRubyz are now…
MRI ‐ “The Normal” Ruby
JRuby ‐ Sun
MacRuby ‐ Apple
IronRuby ‐ Microsoft
Rubinius ‐ EngineYard
MagLev ‐ Gemstone
HotRuby
Why should I care?
For me the purpose of life is partly to have joy.
Programmers often feel joy when they can concentrate
on the creative side of programming,
so Ruby is designed to make programmers happy.
- Yukihiro “Matz” Matsumoto
Why should I care?
Actually, I'm trying to make Ruby natural, not simple.
- Yukihiro “Matz” Matsumoto
Best of breed
If Python was the result of Lisp and C++ having a baby,Ruby is the result of Perl and Smalltalk having a baby.
- MeowMeow Jones, 11/8/2001 on slashdot.
Duck typing
if it looks like a duck
and acts like a duck
it might as well be a duck
Metaprogramming
The computer should be doing the hard work.
That’s what it’s paid to do, after all.
- Larry Wall
Metaprogramming
I don’t think the idea here is to save memory or speed.
The idea behind metaprogramming is
to teach Ruby your conventions
And let it do some guessing
In order to save you some code
- Why, author of why’s poignant guide to Ruby
STOP!!!! Demo time
REPL
ReadEvalPrintLoop
ReadEvalPrintLoop
ReadEvalPrintLoop
ReadEvalPrint
STOP!!!! Demo time
Everything is an object
I invented the term Object-Oriented,
and I can tell you I did not have C++ in mind
- Alan Kay
STOP!!!! Demo time
Classes are open
STOP!!!! Demo time
CLR classes open for business
STOP!!!! Demo time
Adding Iron to Ruby
I have always imagined that paradise will be a kind of library
- Jorge Luis Borges
Gotcha’s
BDD Ruby/CLR interop
IronRuby MVC
Sinatra
Silverlight
Kweshiunz?
“A language that doesn't affect the way you think
about programming is not worth knowing.”
- Alan Perlis
References
http://flanders.co.nz
http://ironruby.net
http://ironruby.info
http://iunknown.com
http://manning.com/carrero
http://rubydoes.net
http://blog.prokrams.com/
http://nightlybuilds.cloudapp.net/Project.aspx?project=dlr
http://blog.jimmy.schementi.com/
go_to(http://ironruby.net).play.create.have_fun