Rochester on Rails: Introduction to Ruby
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The document provides an overview of the Ruby programming language, detailing its history and various features introduced by its creator, Yukihiro 'Matz' Matsumoto. It includes examples of Ruby syntax related to objects, classes, modules, and inheritance, as well as practical coding examples for manipulating arrays and hashes. Additionally, it highlights Ruby's playful approach to programming and links to resources for further learning.
![[‘one’,‘two’,‘three’].each {|num| puts num.capitalize }](https://image.slidesharecdn.com/rochester-on-rails-introduction-to-ruby-1198772254216925-5/85/Rochester-on-Rails-Introduction-to-Ruby-8-320.jpg)
![[‘one’,‘two’,‘three’].each {|num| puts num.capitalize } One Two Three](https://image.slidesharecdn.com/rochester-on-rails-introduction-to-ruby-1198772254216925-5/85/Rochester-on-Rails-Introduction-to-Ruby-9-320.jpg)
![foo = [] foo << 1 #=> [1] foo << 2 #=> [1, 2] foo << 3 #=> [1, 2, 3]](https://image.slidesharecdn.com/rochester-on-rails-introduction-to-ruby-1198772254216925-5/85/Rochester-on-Rails-Introduction-to-Ruby-37-320.jpg)
![bar = [1, 2, 3] bar << 4 #=> [1, 2, 3, 4] bar << 5 #=> [1, 2, 3, 4, 5] bar << 6 #=> [1, 2, 3, 4, 5, 6]](https://image.slidesharecdn.com/rochester-on-rails-introduction-to-ruby-1198772254216925-5/85/Rochester-on-Rails-Introduction-to-Ruby-38-320.jpg)
![folks = %w( Charles Ed Amanda ) #=> [“Charles”, “Ed”, “Amanda”] folks[1] Ed](https://image.slidesharecdn.com/rochester-on-rails-introduction-to-ruby-1198772254216925-5/85/Rochester-on-Rails-Introduction-to-Ruby-39-320.jpg)
![menu = { :douglas_sirk_steak => 17.50, :vanilla_coke => 2.75, :durwood_kirby_burger => 9.75, :five_dollar_shake => 5.00 } menu[:vanilla_coke] 2.75](https://image.slidesharecdn.com/rochester-on-rails-introduction-to-ruby-1198772254216925-5/85/Rochester-on-Rails-Introduction-to-Ruby-41-320.jpg)
Rochester on Rails: Introduction to Ruby
- 1. Ruby Programmers’ Best Friend Jason Morrison January 19, 2006 Rochester on Rails
- 2. History
- 3. Ruby Yukihiro “Matz” Matsumoto February 24, 1993
- 4. Perl Java Python Ruby PHP 1987 1991 1993 1995
- 5. Examples!
- 6. 5.times { print “Ruby! " }
- 7. Ruby! Ruby! Ruby! Ruby! Ruby! 5.times { print “Ruby! " }
- 8. [‘one’,‘two’,‘three’].each {|num| puts num.capitalize }
- 9. [‘one’,‘two’,‘three’].each {|num| puts num.capitalize } One Two Three
- 10. Everything is an object
- 11. -21474836480.abs
- 13. “ Rats live on no evil star” .reverse.capitalize
- 14. “ Rats live on no evil star” .reverse.capitalize “ Rats live on no evil star”
- 15. 3.hours.from_now
- 16. 3.hours.from_now Thu Jan 19 22:05:00 Eastern Standard Time 2006
- 17. Conventions
- 23. Syntax
- 24. Methods def say_hello(name) result = “Hello, #{name}!” return result end puts say_hello(“world”)
- 25. Methods def say_hello(name) “Hello, #{name}!” end puts say_hello(“world”)
- 26. Classes class MathWhiz def say_square(value) puts value * value end end sam = MathWhiz.new sam.say_square(5)
- 27. Open Classes class Integer def squared self * self end end 5.squared #=> 25
- 28. Inheritance class Whopper < Burger @maker = “Burger King” @calories = 0.67 * 10**3 end
- 29. Class Methods class FileUtil def self.mkdir(dir) # do it! end end FileUtil.mkdir(“oranges”)
- 30. Modules module Trig PI = 3.141592654 def Trig.sin(x) # .. end def Trig.cos(x) # .. end end
- 31. Modules require "trig" y = Trig.sin(Trig::PI/4) 0.707106780551956
- 32. Mixins module Debug def whoAmI? “ #{self.type.name} ” + “ (\##{self.id}): ” + “ #{self.to_s}" end end
- 33. Mixins class Phonograph include Debug # ... end ph = Phonograph.new("West End Blues") ph.whoAmI? "Phonograph (#537766170): West End Blues"
- 34. Attributes class PlainOldRubyObject attr_accessor :food, :drinks attr_reader :advice attr_writer :write_only end
- 35. Scope class Poet #public by default def poetry end protected def family_legacy end private def hopes_and_dreams end end
- 36. Arrays
- 37. foo = [] foo << 1 #=> [1] foo << 2 #=> [1, 2] foo << 3 #=> [1, 2, 3]
- 38. bar = [1, 2, 3] bar << 4 #=> [1, 2, 3, 4] bar << 5 #=> [1, 2, 3, 4, 5] bar << 6 #=> [1, 2, 3, 4, 5, 6]
- 39. folks = %w( Charles Ed Amanda ) #=> [“Charles”, “Ed”, “Amanda”] folks[1] Ed
- 40. Hashes
- 41. menu = { :douglas_sirk_steak => 17.50, :vanilla_coke => 2.75, :durwood_kirby_burger => 9.75, :five_dollar_shake => 5.00 } menu[:vanilla_coke] 2.75
- 42. Flow
- 43. if ( score >= 5000 ) puts “You win!” elsif ( score <= 0 ) puts “Game over.” else puts “Current score: #{score}” end
- 44. puts “Watch out!” if lion_distance < 5
- 45. Blocks
- 46. 1.upto(5) { |x| puts x } 1 2 3 4 5
- 47. 5.downto(1) do |time| print “#{time}... ” puts “!” if time <= 3 end 5... 4... 3... ! 2... ! 1... !
- 48. Fín!
- 49. Homepage www.ruby-lang.org Try Ruby in your browser tryruby.hobix.com Ruby with humor www.poignantguide.net