Rochester on Rails: Introduction to Ruby
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A brief and basic introduction to the syntax of Ruby 1.8, along with a few nice language features. This is a talk I gave at one of our first Rochester on Rails meetings.
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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