This document provides a brief introduction to Ruby and Ruby on Rails. It includes examples of basic Ruby code like printing strings and looping through arrays. It demonstrates how Ruby code is more concise and readable compared to Java code for the same tasks. The document then introduces conditional statements and collections in Ruby. It concludes by mentioning a demo of Ruby on Rails and providing some resources to learn more about Ruby and Rails.

1. RUBY + RAILS
A really tiny introduction.
FEU - East Asia College — 11 February 2014

2. こ
ん
に
ち
は
ル
ビ
ー

4. LEARN

5. LEARN
by example :)

6. ハローワールド
Hello.java
public class Hello {!
public static void main(String[] args) {!
System.out.println(“Ohayou, Ruby!”);!
}!
}

7. ハローワールド
Hello.java
public class Hello {!
public static void main(String[] args) {!
System.out.println(“Ohayou, Ruby!”);!
}!
}
hello.rb
puts “Ohayou Ruby!”

9. ハローワールド
Hello.java
public class Hello {!
public static void main(String[] args) {!
System.out.println(“Ohayou, Ruby!”);!
}!
}
hello.rb
puts “Ohayou Ruby!”
110

10. ハローワールド
Hello.java
110
public class Hello {!
public static void main(String[] args) {!
System.out.println(“Ohayou, Ruby!”);!
}!
}
hello.rb
puts “Ohayou Ruby!”
19

11. 578 %
Productivity Gain

12. 578 %
Productivity Gain
(I don’t really know what I’m doing.)

14. 反復する
Loop.java
public class Loop {!
public static void main(String[] args) {!
! ! String fruits[] = new String[]{“apple”, “orange”}!
for(int i = 0; i < fruits.length; i++){!
! ! ! System.out.println(fruit[i]);!
! ! }!
}!
}

15. 反復する
Loop.java
public class Loop {!
public static void main(String[] args) {!
! ! String fruits[] = new String[]{“apple”, “orange”}!
for(int i = 0; i < fruits.length; i++){!
! ! ! System.out.println(fruit[i]);!
! ! }!
}!
}
loop.rb
fruits = [“apple”, “orange”]!
fruits.each do |fruit| !
! puts fruit !
end

16. 反復する
Loop.java
public class Loop {!
public static void main(String[] args) {!
! ! String fruits[] = new String[]{“apple”, “orange”}!
for(int i = 0; i < fruits.length; i++){!
! ! ! System.out.println(fruit[i]);!
! ! }!
}!
}
loop.rb
[“apple”, “orange”].each do |fruit| !
! puts fruit !
end

17. 反復する
Loop.java
public class Loop {!
public static void main(String[] args) {!
! ! String fruits[] = new String[]{“apple”, “orange”}!
for(int i = 0; i < fruits.length; i++){!
! ! ! System.out.println(fruit[i]);!
! ! }!
}!
}
loop.rb
[“apple”, “orange”].each { |fruit| puts fruit }

18. 条件付きの
can_i_go_to_the_club.rb
if(age < 18)!
! puts “Minor!”;!
elsif(age >= 60)!
! puts “Senior”;!
elsif(age >= 18 && age < 60)!
! puts “Legal Age”;

19. 条件付きの
can_i_go_to_the_club.rb
if(age < 18)!
! puts “Minor!”!
elsif(age >= 60)!
! puts “Senior”!
elsif(age >= 18 && age < 60)!
! puts “Legal Age”

20. 条件付きの
can_i_go_to_the_club.rb
if age < 18!
! puts “Minor!”!
elsif age >= 60!
! puts “Senior”!
elsif age >= 18 && age < 60!
! puts “Legal Age”

21. 条件付きの
can_i_go_to_the_club.rb
if age < 18!
! puts “Minor!”!
elsif age >= 60!
! puts “Senior”!
elsif age >= 18 and age < 60!
! puts “Legal Age”

22. コレクション
you_shall_not_pass.rb
passed = [] !
!
students.each do |student|!
! if score > 70!
! ! passed << student!
! end!
end

23. コレクション
you_shall_not_pass.rb
passed = students.map { |s| s.score > 70 }!
passed = students.collect { |s| s.score > 70 }!
!
— OR — !
!
passed = students.delete_if { |s| s.score <= 70 }!
passed = students.reject { |s| s.score <= 70 }

24. RUBY ON RAILS

26. DEMO TIEM!

27. RESOURCES
•
https://www.ruby-lang.org/en/
•
http://guides.rubyonrails.org/
•
http://railscasts.com/
•
http://ruby.railstutorial.org/ruby-on-rails-tutorial-book
•
http://ruby.learncodethehardway.org/

28. SLIDES
http://slidesha.re/1cq6fkn

29. THANK YOU!
Ken-Lauren Daganio
@kendaganio