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Ruby
A Programmer's Best Friend
Presented by Bunlong VAN
http://geekhmer.github.io

Ruby on Rails?
• Ruby – A Programming Language
– Created in 1993 by Yukihiro “Matz” Matsumoto

The Ruby Language
“Ruby is a dynamic, reflective, general-purpose object-oriented
programming language that combines syntax inspired by Perl with
Smalltalk-like features.”
“Interpreted Script Language”
“Ruby was first designed and developed in the mid-1990s by Matz in
Japan.”
“The standard 1.8.7 implementation is written in C. “
•be productive
•to enjoy programming
•and be happy

Reduce Code
public class HelloWorld {
public static void main(String args[]) {
System.out.println(“Hello World”);
}
}
puts “Hellow World”

Code is Human-Readable
“The code was designed from the start to be human-readable and this
mean that non-programmer can have a very easy to understand what a
program is designed to do”.
3.Times { print “Ho!” }

Coderspeak
“Ruby allows you to express your ideas
through a computer”
– Why the lucky stiff
3.times { print “Ho!” }
exit unless “restaurant”.include? “aura”
['toast', 'cheese', 'wine'].each { |food| print food.capitalize }

Ruby on Rails
• Ruby On Rails – A Web Framework
– Created in 2004 by David Heinemeier Hansson
“Ruby on Rails is a Model-View-Controller framework for creating
database-driven websites in Ruby, Rails is build on simple concepts”

Ruby Gems
Problem:
• Hard to find libraries?
Application
Database Interface Mailer Web Services Logger
Solution:
• Package Version & Dependency Management
• Package Delivery
• Package Documentation Management
»gem install rails –include dependencies

Command-line
“The interactive Ruby sheel is a unique feature that allows developers to
maintain and experiment with commands-line. There is no need to write
webpages and check their functionality in browser.”

Object-Oriented-Programming
“Object-Oriented-Programming is a necessity for clean and maintainable
code. However, In Ruby, everything is an object.”

Encourage Testing
Test::Unit builds in into standard library
Other tools Rspec, MiniTest, ...

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