Practical Meta Programming on Rails Application

邦題: Railsアプリでの実用的メタプログラミング (lang:ja)

実プロジェクトで、やり過ぎにならずにメタプログラミングする方法を説明しました。

http://www.joho-shimane.or.jp/docs/2013092500011/

Transcript

1. Practical Meta Programming on Rails Application 3BJMTΞϓϦͰͷ ࣮༻తϝλϓϩάϥϛϯά MOROHASHI Kyosuke @2013-10-19 ߴ౓RubyΤϯδχΞҭ੒ߨ࠲
2. ॾڮګհ
   (@moro) Kyosuke MOROHASHI
5. Agenda ✓ ϝλϓϩάϥϛϯάͱ͸ͳʹ͔ ✓ ϦϑϨΫγϣϯtoolbox ✓ ࣮༻ϝλϓϩάϥϛϯά ✓ ڞ௨ػೳͷநग़ ✓ ϥΠϒϥϦͷ࡞Γํ
6. ࠓ೔ͷΰʔϧ
7. ✓ RubyͰ͸ϝλϓϩάϥϛϯά͸";ͭ ͏"ͩͱࢥ͑ΔΑ͏ʹͳΔ ✓ ϝλϓϩάϥϛϯά༻ͷRubyͷػೳʹͭ ͍ͯɺུ֓Λ͔ͭΉ ✓ ࣮ફతʹϝλϓϩάϥϛϯά͢Δͱ͖ͷ ஫ҙ఺ɾߟ͑ํΛཧղ͢Δ
8. http://www.amazon.co.jp/exec/obidos/ASIN/4048687158/morodiary05-22/ref=noism
9. ✓ RubyͰ͸ϝλϓϩάϥϛϯά͸";ͭ ͏"ͩͱࢥ͑ΔΑ͏ʹͳΔ ✓ ϝλϓϩάϥϛϯά༻ͷRubyͷػೳʹͭ ͍ͯɺུ֓Λ͔ͭΉ ✓ ࣮ફతʹϝλϓϩάϥϛϯά͢Δͱ͖ͷ ஫ҙ఺ɾߟ͑ํΛཧղ͢Δ
10. ϝλϓϩάϥ ϛϯά ͱ͸ͳʹ͔
11. “ ϝλϓϩάϥϛϯάͱ͸ɺ ݴޠཁૉΛ࣮ߦ࣌ʹૢ࡞͢ ΔίʔυΛهड़͢Δ͜ͱ ʮϝλϓϩάϥϛϯάRubyʯ
12. Rubyͷݴޠཁૉ
13. ✓ Ϋϥε ✓ Ϟδϡʔϧ ✓ ΦϒδΣΫτ ͱͦͷঢ়ଶΠϯελϯεม਺ ✓ ϝιου ✓ खଓ͖
14. class Book def title @title end def title=(title) @title = title end end
15. class Book def title @title end def title=(title) @title = title end end
16. ݴޠཁૉΛૢ࡞ͯ͠ Կ౓΋ग़͍ͯΔ 'title'͔Β͍Ζ ͍ΖͰ͖ͳ͍͔?
17. class Book attr_accessor :title end
18. def attr_accessor(name) define_method(name) do instance_variable_get("@#{name}") end define_method("#{name}=") do |val| instance_variable_set("@#{name}", val) end end
19. define_method(:title) do instance_variable_get("@title") end define_method("title=") do |val| instance_variable_set("@title", val) end
20. define_method(:title) do instance_variable_get("@title") end define_method("title=") do |val| instance_variable_set("@title", val) end ϝιουΛಈతʹ௥Ճ
21. define_method(:title) do instance_variable_get("@title") end define_method("title=") do |val| instance_variable_set("@title", val) end Πϯελϯεม਺Λ ม਺໊Λ࢖ͬͯૢ࡞
22. 3VCZͰ͸ɺϝλϓ ϩάϥϛϯάͱͦ͏ Ͱͳ͍΋ͷͱʹ ໌֬ͳ۠ผ͸ͳ͍
23. ·ͱΊ
    ϝλϓϩάϥϛϯάͱ͸ ✓ ݴޠཁૉΛૢ࡞͢Δ ✓ ࣮͸ಛผͳ΋ͷͰͳ͍ ✓ RubyͰ͸೔ৗతʹ΍͍ͬͯΔ
24. ϦϑϨΫγϣϯ toolbox
25. “ϦϑϨΫγϣϯ (re ection) ͱ ͸ɺϓϩάϥϜͷ࣮ߦաఔͰϓ ϩάϥϜࣗ਎ͷߏ଄ΛಡΈऔͬ ͨΓॻ͖׵͑ͨΓ͢Δٕज़ͷ͜ ͱͰ͋Δɻ http://ja.wikipedia.org/wiki/ϦϑϨΫγϣϯ _(৘ใ޻ֶ)
26. http://www.amazon.co.jp/exec/obidos/ASIN/4048687158/morodiary05-22/ref=noism
27. ✓ RubyͰ͸ΫϥεͦΕࣗ਎΋ΦϒδΣΫ τͰ͋Δ ✓ ModuleΫϥεΛܧঝͨ͠ɺClassΫϥε ͷΦϒδΣΫτ ✓ ม਺ʹೖΕͨΓɺҾ਺ʹͨ͠ΓͰ͖Δ Class.is_a?(Object) #=> true
28. klasses = { 'array klass' => Array, 'hash klass' => Hash, } def class_name(klass) klass.name end klasses['array klass'].new #=> [] class_name(klasses['hash klass']) #=> "Hash"
29. ✓ ΫϥεఆٛΛมߋ͢Δϝιου͕͋Δ ✓ include΍extend΍define_method ΋ModuleΫϥεͷϝιου Class.is_a?(Object) #=> true
30. ✓ ॲཧͦͷ΋ͷΛΦϒδΣΫτͱ ͯ͠ѻ͑Δ ✓ Rubyͷେ͖ͳັྗͷҰͭ ϒϩοΫ(Proc)
31. # イテレータや処理の差し替え multiplier = ->(i) { i * 2 } square = ->(i) { i ** 2 } [1, 2, 3].map(&multiplier) [1, 2, 3].map(&square) # リソースの開閉 File.open(path, 'w') {|f| f.puts('content') } # 遅延評価 scope :fresh, -> { where('created_at > ?', 3.hour.ago) } ϒϩοΫ(Proc)
32. 3VCZͷڭ͑ͯ͘Εͨ͜ͱ ౡా
    ߒೋ koji.shimada@enishi-tech.com — You must unlearn what you have learned. ೥݄೔ ౔
    ࡳຈ3VCZձٞ http://www.slideshare.net/snoozer05/20101204-youmustunlearnwhatyouhavelearned
33. ✓ Ҿ਺Ͱࢦఆͨ͠ϝιουΛݺͼग़͢ ✓ ͭ·Γɺݺͼग़͢ϝιουΛϓϩάϥϜ తʹมߋͰ͖Δ Object#send
34. def up_or_down(condition) up_or_down = condition ? :upcase ? :downcase 'Ruby'.send(up_or_down) end up_or_down(true) # => 'RUBY' up_or_down(false) # => 'ruby' Object#send
35. ✓ Ϟδϡʔϧ΍ΫϥεʹɺΠϯελϯεϝ ιουΛ௥Ճ͢Δϝιου ✓ defͷϦϑϨΫγϣϯ൛ ✓ ϝιουͷத਎ΛϒϩοΫͰॻ͘ ✓ ͦͷͨΊϒϩοΫ֎ͷม਺͕ݟ͑Δ define_method
36. class Foo foo = 'FOO' define_method(:foo1) do puts foo + '1' end def foo2 puts foo + '2' end end obj = Foo.new obj.foo1 #=> 'FOO1' obj.foo2 #=> NameError define_method
37. ✓ จࣈྻͰॻ͔ΕͨRubyࣜ΍ϒϩοΫΛɺ Ϋϥε΍ΠϯελϯεͷίϯςΩετͰ ධՁ͢Δ class_eval/ instance_eval
38. ✓ class_eval (module_eval)Λ࢖͏γʔϯ ✓ ClassΫϥεͷprivateϝιουΛݺΜͩΓɺ ✓ Classʹ͋ͱ͔ΒϝιουΛ௥Ճͨ͠Γ͢Δ ✓ instance_eval Λ࢖͏γʔϯ ✓ ΠϯελϯεͷΠϯελϯεม਺Λࢀর͢Δ ✓ privateϝιουΛݺͿ class_eval/ instance_eval
39. class Foo def initialize(message) @message = message end end Foo.class_eval %q[ def greet "#{@message} you!" end ] foo = Foo.new('hi') p foo.greet #=> 'hi you!' p foo.instance_eval { @message } #=> 'hi'
40. ✓ Πϯελϯεม਺Λ໊લϕʔεͰऔಘ͠ ͨΓઃఆͨ͠ΓͰ͖Δ ✓ ͓ͳ͡Α͏ʹclass_varaible_set/ get΋͋Δ instance_variable_set/ instance_variable_get
41. class Foo def initialize(message) @message = message end end foo = Foo.new('hi') foo.instance_variable_get('@message') #=> 'hi'
42. ✓ ଘࡏ͠ͳ͍ϝιουΛݺ͹Εͨ ࣌ʹݺ͹ΕΔϝιου ✓ ActiveRecordͷଐੑऔಘϝιο υͳͲʹ࢖ΘΕ͍ͯΔ method_missing
43. class Foo def method_missing(method, *args, &block) if method = :hi 'hello' else super end end end Foo.new.hi #=> 'hello' method_missing
44. ✓ mixin΋Ϋϥε΍ϞδϡʔϧͷݴޠཁૉΛ ૢ࡞͍ͯ͠Δ ✓ include͸ͦͷΫϥεͷΠϯελϯεϝι ουΛ௥Ճ͢Δ ✓ extend͸ͦͷΦϒδΣΫτʹ(ಛҟ)ϝιο υΛ௥Ճ͢Δ include,extend
45. ✓ Ϟδϡʔϧ͕include͞ΕͨΓextend͞Ε ͨΓ͢Δͱ࣮ߦ͞ΕΔϑοΫ ✓ ܧঝͷλΠϛϯάͰ࣮ߦ͞ΕΔinherited ϝιου΋͋Δ included, extended
46. module MyModule def self.included(base) "included by #{base}" end def self.extended(obj) "extended by #{obj}" end end class MyClass include MyModule # => "included by MyClass" end MyClass.new.extend(MyModule) # => "extended by #<MyClass:0x007fd included, extended
47. ✓ RailsʹΑΔincludeͷ֦ு ✓ ͦͷϞδϡʔϧʹ ClassMethods ͱ͍͏ Ϟδϡʔϧ͕͋Ε͹ɺͦΕΛextend͢Δ ✓ included {} ͱ͍͏ɺincludedϑοΫ ૬౰ͷΫϥεϚΫϩ͕͋Δ ActiveSupport::Concern
48. module MyModule included(base) "included by #{base}" end module ClassMethods def hi; 'hello' ; end end end class MyClass include MyModule # => "included by MyClass" end MyClass.hi # => "hello" ActiveSupport::Concern
49. ·ͱΊ
    ϦϑϨΫγϣϯ UPPMCPY ✓ RubyͷΫϥε͸ʮ΍ΘΒ͔͍ʯ ✓ ૢ࡞͢ΔͨΊͷϝιου͕ͨ͘͞Μ͋Δ ✓ ʮϝλϓϩάϥϛϯάRubyʯ͓͢͢Ί
50. ࣮༻ϝλϓϩ άϥϛϯά
51. ϝλϓϩάϥ ϛϯάͷ མͱ݀͠
52. Book = Class.new do define_method(:initialize) do |attrs| attrs.each do |key, value| if respond_to?("#{key}=") send("#{key}=", value) else instance_variable_set("@#{key}", value) end end end define_method(:price=) do |price_str| instance_variable_set( '@price', price_str.delete(',').to_i ) end end p Book.new(author: 'moro', price: '1,980')
53. class Book def initialize(attrs) @author = attrs[:author] self.price = attrs[:price] end def price=(price_str) @price = Integer(price_str.delete(',')) end end Book.new(author: 'moro', price: '1,980') #=> #<Book:0x007faddb148b48 @author="moro", @price=1980>
54. ✓ ϝλϓϩάϥϛϯάͷ ίʔυ͸"೉͍͠" ✓ ͱΓΘ͚ϦϑϨΫγϣϯ ✓ sendظ, evalظ
55. ϝλʹߟ͑ͯ ϕλʹ࡞Δ
56. ActiveRecord::Base.has_many assoc_name assoc_name で指定された、複数の 子レコードへの関連を定義する。
57. class Books < ActiveRecord::Base has_many :reviews end Book#reviews #reviews= #review_ids #review_ids= ... Book#reviews.build reviews.create reviews.each {|review| ... } reviews.where(...) ͨ͘͞Μϝιου͕Ͱ͖Δ
58. def has_many(name, opts = {}) class_eval <<-RUBY def #{name} klass = #{name.to_s.classify} klass.where(#{fk}: id) end def #{name}=(value) values.each do |value| #{name.to_s.classify}.create!(...) end end RUBY end ೉ͦ͠͏ͳ࣮૷Πϝʔδ
59. ActiveRecord::Base.has_many assoc_name assoc_name で指定された、複数の 子レコードへの関連を扱うオブジェクトのための ラッパーメソッドを定義する。
60. Book#reviews ✓ ඥ෇͍͍ͯΔϨϏϡʔΛฦ͢ɺ ͷͰ͸ͳ͍ ✓ ਌ʹඥͮ͘ϨϏϡʔ͕͋Δͱ͍͏ ؔ࿈Λද͢ΦϒδΣΫτΛฦ͢
61. def define_readers mixin.class_eval <<-CODE, __FILE__, __LINE__ + def #{name}(*args) association(:#{name}).reader(*args) end CODE end ؔ࿈Λද͢ ΦϒδΣΫτΛฦ͢
62. Associationͷநग़ ✓ owner ͱ target ͕͍Δ ✓ owner ͷ id ͱtarget ͷ fk Ͱݕࡧ ͢Δ scope Λ࡞Δ ✓ target Λϩʔυ͠ɺద੾ʹϝϞԽ ✓ ௥Ճ࡟আͷίʔϧόοΫΛ؅ཧ͢Δ
63. = Active Record Associations This is the root class of all associations ('+ Foo' signifies an included module Foo): Association SingularAssociation HasOneAssociation HasOneThroughAssociation + ThroughAssociation BelongsToAssociation BelongsToPolymorphicAssociation CollectionAssociation HasAndBelongsToManyAssociation HasManyAssociation HasManyThroughAssociation + ThroughAssociation
64. ✓ ਌Ϩίʔυ͔ΒࢠϨίʔυΛ Ҿ͘ϝιουΛ࡞Δ ✓ ਌ϨίʔυͱࢠϨίʔυͱͷ ؔ࿈Λද͢ΫϥεΛ࡞Δ
65. def define_readers mixin.class_eval <<-CODE, __FILE__, __LINE__ + def #{name}(*args) association(:#{name}).reader(*args) end CODE end ϦϑϨΫγϣϯͰ ബ͍ϥούʔΛ࡞Δ
66. ·ͱΊ ࣮༻ϝλϓϩάϥϛϯά ✓ ϝλʹߟ͑ͯϕλʹ࡞Δ ✓ ϦϑϨΫγϣϯͰͭͳ͙
67. ڞ௨ػೳͷ நग़
68. ౤ߘνΣοΫ ػೳͷྫ
69. ✓ هࣄ(Post)ͱίϝϯτ(Comment)ͱ ը૾(Photo)ͷ౤ߘ಺༰ΛνΣοΫ ✓ ͦΕͧΕ͝ͱͷ಺༰Ͱ֎෦αʔϏ εʹ౤ߘ͍ͨ͠ ✓ Post͸λΠτϧͱຊจɺίϝϯτ͸ຊ จɺը૾͸දࣔURL
70. class Post < AR::Base after_save :submit_content_monitoring private def submit_content_monitoring content = [title, body].join("\n\n") url = Rails.config.censoring_endpoint req = Net::HTTP::Post.new(url.path) req.set_form_data('content' => content) Net::HTTP.start(url.hostname, url.port) do |htt http.request(req) end end
71. class Comment < AR::Base ... def submit_content_monitoring content = body ... end end class Photo < AR::Base ... def submit_content_monitoring content = "<img src='http://img.example.com/#{id}' />" ... end end
72. ڞ௨෦෼Λ ୳͢
73. class Post < AR::Base after_save :submit_content_monitoring private def submit_content_monitoring content = [title, body].join("\n\n") url = Rails.config.censoring_endpoint req = Net::HTTP::Post.new(url.path) req.set_form_data('content' => content) Net::HTTP.start(url.hostname, url.port) do |htt http.request(req) end end
74. class Post < AR::Base after_save :submit_content_monitoring private def submit_content_monitoring Censoring.new( [title, body].join("\n\n"), Rails.config.censoring_endpoint ).submit end end
75. class Censoring def initialize(content, url) @content = content @url = url end def submit req = Net::HTTP::Post.new(@url.path) req.set_form_data('content' => @content) Net::HTTP.start(@url.hostname, @url.port) do |h http.request(req) end end end
76. class Post < AR::Base after_save :submit_content_monitoring private def submit_content_monitoring Censoring.new( [title, body].join("\n\n"), Rails.config.censoring_endpoint ).submit end end
77. ϝλʹߟ͑ͯϕλʹ࡞Δ ର৅Ϋϥε͝ͱʹɺ౤ߘ νΣοΫ಺༰Λ૊Έཱͯ ૹ৴͢ΔΫϥε͕΄͍͠
78. class CensorAdapter def initialize(endpoint, &block) @endpoint = endpoint @content_builder = block end def submit(record) content = @content_builder.call(record) Censoring.new(content, @endpoint).submit end end # ---------------- post_adapter = CensorAdapter.new(endpoint) do |post| [post.title, post.body].join("\n\n") end post_adapter.submit(post)
79. class Post < AR::Base @@censor_adapter = CensorAdapter.new(config.endpoint) do |post| [post.title, post.body].join("\n\n") end after_save :submit_content_monitoring private def submit_content_monitoring @@censor_adapter.submit(self) end end
80. class Comment < AR::Base @@censor_adapter = CensorAdapter.new(config.endpoint) do |comment| comment.body end after_save :submit_content_monitoring private def submit_content_monitoring @@censor_adapter.submit(self) end end
81. class Photo < AR::Base @@censor_adapter = CensorAdapter.new(config.endpoint) do |photo| "<img src='http://img.example.com/#{photo.id}' />" end after_save :submit_content_monitoring private def submit_content_monitoring @@censor_adapter.submit(self) end end
82. ϦϑϨΫγϣϯͰͭͳ͛Δ ౤ߘ͢ΔͨΊͷϝιουΛ ௥Ճͯ͠·ΘΔͷΛɺͳΜ ͱ͔Ͱ͖ͳ͍͔
83. module CeonsoringDsl def censor_content(url, &block) adapter = CensorAdapter.new(url, block) after_save {|record| adapter.submit(record) } end end
84. class Post < AR::Base extend CensoringDsl censor_content(config.endpoint) do |post| [post.title, post.body].join("\n\n") end end
85. QSPUJQ ࡞͍ͬͨΖΜͳΫϥεΛ $PODFSOʹ·ͱΊΔ
86. module Censorable extend ActiveSupport::Concern module ClassMethods def censor_content(url, &block) adapter = Censorable::Adapter.new(url, block after_save {|record| adapter.submit(record) end end class Adapter ... class Request ... end
87. class Post < ActiveRecord::Base include Censorable censor_content(config.censoring_endpoint) do |pos [post.title, post.body].join("\n\n") end end
88. ·ͱΊ ڞ௨ػೳͷநग़ ✓ ϝλʹߟ͑ͯϕλʹ࡞Δ ✓ ϦϑϨΫγϣϯͰͭͳ͙
89. ϥΠϒϥϦͷ ࡞Γํ
90. আʑʹ ΞϓϦ಺ ϥΠϒϥϦ΁
91. ػೳΛผϑΝΠϧʹ෼͚ͨ͹͔Γ ΞϓϦඇґଘʹͨ͠΋ͷ app/** lib/** gem
92. app/** ʹ͋ΔϥΠϒϥϦ ✓ ࠷ॳʹநग़ͨ͠ػೳ͸app/ models ͳͲʹஔ͚Δ ✓ AR::BaseΛܧঝ͍ͯ͠ͳ͍Ϟσ ϧ΋͋ͬͯΑ͍!
93. lib/**ʹ΋͍ͬͯ͘ ✓ ΞϓϦ΁ͷґଘΛͳ͘͢ ✓ ౰વͳ͕ΒɺΞϓϦ͸ϥΠϒϥϦʹґଘ ͍ͯ͠Δ ✓ LOAD_PATH͸௨͍ͬͯΔͷͰ ͦͷ··͍͚࣋ͬͯΔ
94. HFN΁
96. ✓ ར༻͍ͯ͠ΔgemͷɺҰࣜ૊Έ ߹Θͤ(bundle)Λ؅ཧ͢Δ ✓ όʔδϣϯ΍ೖख৔ॴ΋؅ཧͰ͖Δ ✓ gemͷͻͳܗ͕Ͱ͖Δ
97. ✓ ΠϚυΩͬΆ͍σΟϨΫτϦߏ଄Ͱɺ gemͷͻͳܗ͕Ͱ͖Δ ✓ gemͷϝλσʔλϑΝΠϧ*.gemspec ΛຒΊΔ͚ͩͰgem͕Ͱ͖Δ $ bundle gem name
98. $ bundle gem censorable create censorable/Gemfile create censorable/Rakefile create censorable/LICENSE.txt create censorable/README.md create censorable/.gitignore create censorable/censorable.gemspec create censorable/lib/censorable.rb create censorable/lib/censorable/version.rb Initializating git repo in /Users/moro/tmp/censorab
99. Gem::Specification.new do |spec| spec.name = "censorable" spec.version = Censorable::VERSION spec.authors = ["moro"] spec.email = ["moronatural@gmail.com"] spec.description = %q{TODO: Write a gem descrip spec.summary = %q{TODO: Write a gem summary spec.homepage = "" spec.license = "MIT" spec.files = `git ls-files`.split($/) spec.executables = spec.files.grep(%r{^bin/}) { spec.test_files = spec.files.grep(%r{^(test|sp spec.require_paths = ["lib"] spec.add_development_dependency "bundler", "~> 1. spec.add_development_dependency "rake"
100. $ bundle exec rake build censorable 0.0.1 built to pkg/censorable-0.0.1.gem. # rubygems.orgのアカウントがあればすぐ公開できる $ bundle exec rake release ͱͯ΋؆୯ʹgem͕Ͱ͖Δ
101. $ bundle gem censorable create censorable/Gemfile create censorable/Rakefile create censorable/LICENSE.txt create censorable/README.md create censorable/.gitignore create censorable/censorable.gemspec create censorable/lib/censorable.rb create censorable/lib/censorable/version.rb Initializating git repo in /Users/moro/tmp/censorab ͋ͱ͸libͷԼʹ ಺༰Λ࣋ͬͯ͘Δ͚ͩ
102. $ bundle gem censorable create censorable/Gemfile create censorable/Rakefile create censorable/LICENSE.txt create censorable/README.md create censorable/.gitignore create censorable/censorable.gemspec create censorable/lib/censorable.rb create censorable/lib/censorable/version.rb Initializating git repo in /Users/moro/tmp/censorab όʔδϣϯ͸͜ͷ ϑΝΠϧʹॻ͍͍ͯ͘
103. $ cat lib/censorable/version.rb module Censorable VERSION = "0.0.1" end
104. gem 'censorable', path:'/Users/moro/tmp/censorable' or gem 'censorable', github: 'moro/censorable' or gem 'censorable', git: 'git://github.com/moro/censo Gem leʹ௥Ճ͢Ε͹OK
105. ػೳΛผϑΝΠϧʹ෼͚ͨ͹͔Γ ΞϓϦඇґଘʹͨ͠΋ͷ ผHFNʹͯ͠ΈΔςετ ࣾ಺ڞ௨ϥΠϒϥϦͳͲ ੈʹ޿͘ϦϦʔεͨ͠ϥΠϒϥϦ app/** lib/** gem+path: gem+git: gem
106. ·ͱΊ
     ϥΠϒϥϦͷ࡞Γํ ✓ ΞϓϦέʔγϣϯ͔Β আʑʹநग़͠ɺlibʹ͍࣋ͬͯ͘ ✓ gemʹ͢Δʹ͸ɺ࡞Δͱ͖΋࢖ ͏࣌΋bundlerΛ׆༻͢Δ
107. ·ͱΊ
108. ࠓ೔ͷΰʔϧ
109. ✓ RubyͰ͸ϝλϓϩάϥϛϯά͸";ͭ ͏"ͩͱࢥ͑ΔΑ͏ʹͳΔ ✓ ϝλϓϩάϥϛϯά༻ͷRubyͷػೳʹͭ ͍ͯɺུ֓Λ͔ͭΉ ✓ ࣮ફతʹϝλϓϩάϥϛϯά͢Δͱ͖ͷ ஫ҙ఺ɾߟ͑ํΛཧղ͢Δ
110. 3VCZ΍3BJMTͷ։ൃͰ͸ɺ ϝλϓϩάϥϛϯάͱɺͦ͏ Ͱͳ͍΋ͷͷ۠ผ͸ᐆດɻ
111. ͍ͭ΋࢖͍ͬͯΔػೳ͕ɺ ࣮͸ಈతϝιουఆٛͩͬ ͨΓ͢Δ͠ɺͦΕΛࣗ෼Ͱ ࡞Δ͜ͱ΋؆୯
112. ͦ͜Ͱ΍Γա͗ͳ͍ͨΊʹɺ ʮϝλʹߟ͑ϕλʹॻ͘ʯ͜ ͱΛ৺͕͚Δ (͍ͬΆ͏ͰϦϑϨΫγϣϯΛ࢖͍·͘Δ "࿅श"΋ͯ͠ΈΔͱͨͷ͍͠Ͱ͢)
113. แׅతͳ׬੒඼Λ໨ࢦ͢ͷ Ͱ͸ͳ͘ɺ࣮ΞϓϦͷػೳ Λɺগͣͭ͠஫ҙਂ͘ ϝλʹ͍ͯ͘͠ͷ͕େࣄ
114. ͦΕ͕Ͱ͖Δॊೈੑ͕ 3VCZͷྑ͞
115. “Ruby͸܅Λ৴པ͢ΔɻRuby͸܅Λ ෼ผͷ͋ΔϓϩάϥϚͱͯ͠ѻ͏ɻ Ruby͸ϝλϓϩάϥϛϯάͷΑ͏ͳ ڧྗͳྗΛ༩͑Δɻͨͩ͠ɺେ͍ͳ Δྗʹ͸ɺେ͍ͳΔ੹೚͕൐͏͜ͱ Λ๨Εͯ͸͍͚ͳ͍ɻͦΕͰ͸ɺ RubyͰͨͷ͍͠ϓϩάϥϛϯάΛɻ ʮϝλϓϩάϥϛϯάRubyʯ ংจΑΓ Matz says: