winnipeg.rb user group - ruby intro september 2010

8/8/2019 Winnipeg.rb User Group - Ruby Intro September 2010

1/75

Ruby from the ground

up.

By: Nathan Bertram

@nathanbertram


2/75

What Ill be talking

about.

1. Background & where ROR fits in.2. Basics of Ruby & interesting tidbits

3. Other lang comparison

4. How you can learn Ruby & Rails and its community


3/75

Who am I?- Started out in the PHP world

- Obsessed web standards geek.

- Have been working professionally with Ruby &

ROR for almost 3 years now


4/75


5/75


6/75

New to Ruby?


7/75

- Yukihiro Matsumoto

I wanted a scripting language that

was more powerful than Perl, and

more object-oriented than Python


8/75

Ruby ResultedA dynamic, open source programming language

with a focus on simplicity and productivity.It has an elegant syntax

that is natural to read and easy to write.

via http://www.ruby-lang.org


9/75

Ruby is an interpreted/scripting language

- terse (concise & to the point)

- completely object-oriented

- standard 1.8.7 implementation written in C- wide open, even at runtime


10/75

96 Standard Libraries

Read/Write CSV XML YAML

Talk to Email FTP Web

Work with Math Templates Threads

Tools for Debugging Docs Testing

Tons of 3rd party open source available.


11/75

!=


12/75

& = FREE


13/75

Date (Rails)


14/75

Common Uses- Web Apps (Ruby on Rails, Sinatra)

- One off scripts (data mining for eg.)

- Code Generation & Image Processing- Cross platform GUI apps (WxRuby, FXRuby, Ruby

TK)

- Mac Desktop apps (MacRuby, Cocoa, Robot +

JRuby)- IronRuby for .Net apps


15/75

Some Philosophy


16/75

OSCON 2003 - Matz: The Power and

Philosophy ofRuby

I want a programming to help me andothers:

- Program better

- Think smarter

- Finish the task at hand quicker

http://www.rubyist.net/~matz/slides/oscon2003/mgp00001.html

http://rubylearning.com/blog/2010/09/28/the-ruby-movement/


17/75

Principle of Least Surprise


18/75

Principle of Succinctness


19/75

Principle of Human Interface


20/75


21/75

Show me the code.


22/75


23/75

( )


24/75

Strings


25/75

Strings


26/75

Variables


27/75

Methods


28/75

Methods


29/75

In Ruby, only false and nil are false

0 is true "" is true

[] is true


30/75

Control Structures


31/75

Control Structures


32/75

Control Structures


33/75

Control Structures


34/75

Demo on Classes


35/75

Classes


36/75

Classes


37/75

Inheritance


38/75

Modules


39/75

Constants


40/75


41/75

Symbols are similar to strings, but are only

allocated memory once, and are never freed.

Great for keys, column names, and other

strings that are repeated over and over again.

They read well.


42/75


43/75

Hash


44/75

Hash


45/75

Hash


46/75

Hash


47/75

Hash


48/75

Arrays


49/75

Arrays


50/75

Arrays


51/75

Regular Expressions


52/75

Regular Expressions


53/75

Blocks & Iterators


54/75

Blocks & Iterators


55/75

Blocks & Iterators


56/75

Blocks & Iterators


57/75

.inspect

.methods


58/75

Differences from C++

No type casting

Theres only two container types: Array

and Hash

Theres no type conversions, youllprobably find that they arent necessary

Multithreading is built-in


59/75

Differences from C++

A unit testing lib comes standard with Ruby

Its selfinstead ofthis

Objects are strongly but dynamically typed.The runtime discovers at runtime if that

method call actually works


60/75

Differences from Java

Theres no static type checking.Variablenames are just labels. They dont have a

type associated with them

There are no type declarations

foo = Foo.new(hi) instead ofFoo foo = new Foo(hi)

Documentation


61/75

Documentation

- Standard Library with Ruby contains ~ 9000 methods- Many are documented internally with a local system

called RDOC

- My personal favourite: http://apidock.com/- http://www.gotapi.com/ (Not just ruby, css, js, jquery,

etc.)

- http://rubybrain.com

- http://stdlib.rubyonrails.org/

- http://corelib.rubyonrails.org/


62/75

How can I learn ruby?


63/75


64/75

RubyKoans.comHighly recommend ifyouve programmed

before.

Great TDD approach with

TestUnit and its fun!


65/75

Whys (Poignant) Guide to Ruby

http://mislav.uniqpath.com/poignant-guide/


66/75

RubyQuiz.comGreat way to improve your

existing ruby skills

157 Quizes.

Detailed & many solutions

so solve the given quiz.


67/75

http://www.TeachMeToCode.com


68/75

- http://rubylearning.com

- http://railscasts.com/ (FREE)

- http://asciicasts.com/ (FREE)

- http://peepcode.com/

- http://envycasts.com/


69/75

The people in this room.

e u y a s


70/75

e u y a s

Community

e u y a s


71/75

http://railsbridge.org/projects

#ruby and #rubyonrails on irc.freenode

http://rubyonrails.org

e u y a s

Community

http://confreaks.net/http://www.rubyinside.com/http://www.railsinside.com/

http://railsmagazine.com

e u y a s


72/75

Some Bloggers I follow:

e u y a s

Community

http://mislav.uniqpath.com/

@ruby_news on twitter

http://www.igvita.com/

http://weblog.jamisbuck.org/

http://blog.jayfields.com/http://www.loudthinking.com/

http://www.hashrocket.com/blog/

http://yehudakatz.com/

http://pivotallabs.com/blog


73/75

http://ruby-toolbox.com/


74/75


75/75

Thanks!

winnipeg.rb user group - ruby intro september 2010

Documents