Ruby A Programmer's Best Friend http://creativecommons.org/licenses/by/2.5/

Ruby

A Programmer's Best Friend

Disclaimer: This ((might|will) be|is) a Technical Talk

Disclaimer: This might be a Technical Talk This will be a technical talk This is a Technical talk

You decide.

aizat.who? Ezwan Aizat Bin Abdullah Faiz [email_address] Web Developer Ruby, Ruby on Rails, PHP, LAMP (Previous) MyOSS Meetup Organizer

Ezwan Aizat Bin Abdullah Faiz

[email_address]

Web Developer

Ruby, Ruby on Rails, PHP, LAMP

(Previous) MyOSS Meetup Organizer

My Background Still a University Student Monash University 10 years ago Basic HTML Took a long break 5 years ago, I tried to learn C++ 3 years ago, I learned PHP 1 year ago, I experimented with C, Ruby, Python Winner of the eGenting Competition 2006 using Ruby

Still a University Student

Monash University

10 years ago

Basic HTML

Took a long break

5 years ago, I tried to learn

C++

3 years ago, I learned

PHP

1 year ago, I experimented with

C, Ruby, Python

Winner of the eGenting Competition 2006

using Ruby

Ruby.is_a? Programming Language Interpreted Scripting Language Duck language Inspired from: Smalltalk, Perl, Lisp, Python, CLU, Dylan Syntax is generally like all other programming languages

Programming Language

Interpreted Scripting Language

Duck language

Inspired from:

Smalltalk, Perl, Lisp, Python, CLU, Dylan

Syntax is generally like all other programming languages

Ruby's History and Background Developed in Japan Yukihiro Matsumoto Was in Malaysia last year for AsiaOSS First public Release in 1995 Aim was in “trying to make Ruby natural, not simple,”

Developed in Japan

Yukihiro Matsumoto

Was in Malaysia last year for AsiaOSS

First public Release in 1995

Aim was in “trying to make Ruby natural, not simple,”

Often people, especially computer engineers, focus on the machines . They think, "By doing this, the machine will run faster. By doing this, the machine will run more effectively. By doing this, the machine will something something something." They are focusing on machines . But in fact we need to focus on humans , on how humans care about doing programming or operating the application of the machines. We are the masters. They are the slaves. Yukihiro Matsumoto

Basic Features Classes, Inheritance Threads Cross Platform Iterators and Closures Garbage Collection Exception Handling Object Oriented Regular Expressions Variables are not typed Powerful string operations Operator Overloading Introspection, Reflection, Meta programming

Classes, Inheritance

Threads

Cross Platform

Iterators and Closures

Garbage Collection

Exception Handling

Object Oriented

Regular Expressions

Variables are not typed

Powerful string operations

Operator Overloading

Introspection, Reflection, Meta programming

To Ruby From Java Similarities Garbage Collector Objects are strongly typed public, private and protected methods Embedded doc tools Differences Don't need to compile code, just run it No static type checking No casting http://www.ruby-lang.org/en/documentation/ruby-from-other-languages/to-ruby-from-java/

Similarities

Garbage Collector

Objects are strongly typed

public, private and protected methods

Embedded doc tools

Differences

Don't need to compile code, just run it

No static type checking

No casting

To Ruby From PHP Similarities Dynamically typed eval Fairly large standard library Arrays and hashes work like expected Differences Strong typing Everything is an object No abstract classes or interfaces Almost everything is a method call http://www.ruby-lang.org/en/documentation/ruby-from-other-languages/to-ruby-from-php/

Similarities

Dynamically typed

eval

Fairly large standard library

Arrays and hashes work like expected

Differences

Strong typing

Everything is an object

No abstract classes or interfaces

Almost everything is a method call

Ruby declared TIOBE's Programming Language of 2006 http://www.oreillynet.com/ruby/blog/2007/01/ruby_declared_tiobes_programmi.html

Ruby declared TIOBE's Programming Language of 2006

http://www.oreillynet.com/ruby/blog/2007/01/ruby_declared_tiobes_programmi.html

TIOBE Programming Community Index

TIOBE Programming Community Index In the recent past it was necessary to have a large company behind the language to get it in the spotlight (Sun with Java, Microsoft with C#), but nowadays a killer app appears to be sufficient. Viral marketing via the Internet works! The winners of the last 2 years, PHP and Java, are the losers of this year.

Generally its like all other programming languages, Except with a few syntax changes

Generally its like all other programming languages,

Except with a few syntax changes

Conditions General Ruby if condition # ... elsif condition2 # ... else # ... end b = a if condition unless condition # ... else # ... end b = a unless condition if (condition) { # ... } else if (condition2) { # ... } else { # ... }

General

Ruby

Loops General Ruby while i < 5 # ... end until i == 5 # ... end apples.each { | apple | ... } shapes.each do | shape | puts shape.polygon? puts shape.sides? end while (condition) { # ... } for (int i; i < array.length; i++) { # ... }

General

Ruby

Exception Handling Ruby General try { # ... } catch (Exception e) { # ... } finally { # ... } begin # ... rescue RuntimeException => e # ... rescue e # ... ensure # ... end

Ruby

General

The Differences “Ruby is simple in appearance, but is very complex inside, just like our human body” Yukihiro Matsumoto http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/2773

The Differences

“Ruby is simple in appearance, but is very complex inside, just like our human body”

Yukihiro Matsumoto

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/2773

Optional Syntax Full of Expression

Expression Parentheses are optionals (sometimes) Semicolons are optional Methods can include '!' and '?' array.uniq.sort “ Ruby IS THE BOMB”.downcase! “ Regular expressions are fun”.gsub(/fun/, 'sweet') “ Wasting space “.strip!

Parentheses are optionals (sometimes)

Semicolons are optional

Methods can include '!' and '?'

Simpler AND Nicer looking code

Everything is an Object

Numbers and other primitive types are not objects 1.upto(100) { |i| puts i } 3.14159265.ciel 2.71828182845905.floor

Numbers and other primitive types are not objects

Meta Programming (or shooting oneself in the foot)

Meta Programming

(or shooting oneself in the foot)

What is Meta Programming? Metaprogramming is the writing of computer programs that write or manipulate other programs (or themselves) as their data or that do part of the work during compile time that is otherwise done at run time. In many cases, this allows programmers to get more done in the same amount of time as they would take to write all the code manually. Taken from http://en.wikipedia.org/wiki/Metaprogramming

Magic! Santize a string Convert all non alphanumeric to a 'underscore' class String def sanitize self .gsub( / [^a-z1-9]+ /i , ' _ ' ) end end puts &quot; Ruby gives you alot of $$$ yo! &quot; .sanitize # Ruby_gives_you_alot_of_yo_

Santize a string

Convert all non alphanumeric to a 'underscore'

Need to shuffle an array? class Array def shuffle size.downto( 1 ) { | n | push delete_at(rand(n)) } self end end %w[ a b c d e f g ] .shuffle # [&quot;c&quot;, &quot;e&quot;, &quot;f&quot;, &quot;g&quot;, &quot;b&quot;, &quot;d&quot;, &quot;a&quot;]

Need to shuffle an array?

Why Ruby?

Why Ruby?

Simpler and concise Full of expression Easier to understand Productive Large number of libraries

Simpler and concise

Full of expression

Easier to understand

Productive

Large number of libraries

But, mainly because it's a lot more FUN

Who uses Ruby? HP Sun Microsoft Intel NASA NOAA 37 signals etc... Whole community built around it Ruby Central - Non Profit Organization Ruby Conference etc...

HP

Sun

Microsoft

Intel

NASA

NOAA

37 signals

etc...

Whole community built around it

Ruby Central - Non Profit Organization

Ruby Conference

etc...

Ruby on Rails Convention over Configuration http://www.rubyonrails.com

Convention over Configuration

http://www.rubyonrails.com

Hottest thing to hit Web Development Web Application Framework Rapid Application/Iterative Development AJAX ready Convention over Configuration Why Ruby? Dynamic Flexible Utilizes Meta Programming heavily Domain specific language

Web Application Framework

Rapid Application/Iterative Development

AJAX ready

Convention over Configuration

Why Ruby?

Dynamic

Flexible

Utilizes Meta Programming heavily

Domain specific language

Buzz Words Buzz Words Buzz Words

Popular Sites Basecamp Project Management Twitter What are you doing?

Basecamp

Project Management

Twitter

What are you doing?

Why not Ruby?

Several Limitations Slow performance not massively, just marginally Benefit is better code Now a days we have processing cycles to waste Write it in Ruby C Extensions! Fixed in Ruby 2.0 Limited Unicode Support Fixed in Ruby 2.0 So when is Ruby 2.0 coming out? Hopefully soon...

Slow performance

not massively, just marginally

Benefit is better code

Now a days we have processing cycles to waste

Write it in Ruby C Extensions!

Fixed in Ruby 2.0

Limited Unicode Support

Fixed in Ruby 2.0

So when is Ruby 2.0 coming out?

Hopefully soon...

Resources Programs

IRB – Interactive Ruby Experiment with Ruby from the command line Write quick code snippets Enhanceable using Ruby Support syntax highlighting $ irb >> puts “Hello World” Hello World => nil >>

Experiment with Ruby from the command line

Write quick code snippets

Enhanceable using Ruby

Support syntax highlighting

RI – Ruby Information Quick Ruby documentation Takes from both the ruby core code and the external libraries (rubygems) $ ri String#chop! Returns a new String with the last character removed. If the string ends with
, both characters are removed. Applying chop ...

Quick Ruby documentation

Takes from both the ruby core code and the external libraries (rubygems)

Resources Sites

Informational Ruby Progamming Language http://www.ruby-lang.org Wikipedia all knowing, all powerful Wikipedia http://www.ruby-lang.org

Ruby Progamming Language

http://www.ruby-lang.org

Wikipedia

all knowing, all powerful Wikipedia

http://www.ruby-lang.org

Learning Why's (Poignant) Guide to Ruby http://poignantguide.net/ruby/ Ruby In Twenty Minutes http://www.ruby-lang.org/en/documentation/quickstart/

Why's (Poignant) Guide to Ruby

http://poignantguide.net/ruby/

Ruby In Twenty Minutes

http://www.ruby-lang.org/en/documentation/quickstart/

MyOSS Meetup Bob Sutor Speaking on Open Source, Open Standards and ODF The Shift to 'Open': Boost or Brakes for Innovation and Business 20 th April (next Friday) Open University Malaysia (near KLCC) 7:00-9:30pm http://foss.org.my/projects/meetups/april-2007

Bob Sutor

Speaking on Open Source, Open Standards and ODF

The Shift to 'Open': Boost or Brakes for Innovation and Business

20 th April (next Friday)

Open University Malaysia (near KLCC)

7:00-9:30pm

http://foss.org.my/projects/meetups/april-2007

Questions? Thank You [email_address]

Questions?

Thank You

[email_address]

Let's Dive Into Ruby

Let's Dive Into Ruby