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A large executable list of methods of define singleton methods in ruby
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| ############################################## | |
| # Different ways to define singleton methods # | |
| ############################################## | |
| # Being able to reference external instance variables when creating a method | |
| # enables useful meta-programming techniques in ruby. The styles which are | |
| # capable of this will define methods that "Moof!" (like Clarus the Dogcow). | |
| moof = "Moof!" | |
| def test_singleton_method desc="#?" | |
| animal = 'dog' | |
| yield animal | |
| puts "#{desc}: \t#{animal.speak}" | |
| end | |
| #============================================= | |
| test_singleton_method "#1" do |dog| | |
| def dog.speak | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| test_singleton_method "#2" do |dog| | |
| dog.instance_eval do | |
| def speak | |
| defined?(moof)&&moof||"Woof" | |
| end | |
| end | |
| end | |
| test_singleton_method "#3" do |dog| | |
| class << dog | |
| def speak | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| end | |
| test_singleton_method "#4" do |dog| | |
| class << dog | |
| define_method(:speak) do | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| end | |
| test_singleton_method "#5" do |dog| | |
| class << dog | |
| define_method(:speak, lambda { defined?(moof)? moof : "Woof" }) | |
| end | |
| end | |
| test_singleton_method "#6" do |dog| | |
| module SpeakableDog | |
| def speak | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| class << dog | |
| include SpeakableDog | |
| end | |
| end | |
| test_singleton_method "#7" do |dog| | |
| module SpeakableDog | |
| def speak | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| dog.extend SpeakableDog | |
| end | |
| test_singleton_method "#8" do |dog| | |
| klass = class << dog; self; end | |
| klass.send :define_method, :speak do | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| #================ Ruby 1.9.2 ==================== | |
| test_singleton_method "#9" do |dog| | |
| module SpeakableDog | |
| def speak | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| dog.singleton_class.send(:include, SpeakableDog) | |
| end | |
| test_singleton_method "#10" do |dog| | |
| dog.singleton_class.class_eval do | |
| def speak | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| end | |
| test_singleton_method "#11" do |dog| | |
| dog.singleton_class.send(:define_method, :speak) do | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| test_singleton_method "#12" do |dog| | |
| dog.define_singleton_method(:speak) do | |
| defined?(moof)? moof : "Woof" | |
| end | |
| end | |
| test_singleton_method "#13" do |dog| | |
| dog.singleton_class.send(:define_method, :speak, lambda { defined?(moof)? moof : "Woof" }) | |
| end |
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