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samnang/singleton_methods.rb

Created January 15, 2011 04:11
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Different ways to define singleton methods
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singleton_methods.rb
##############################################
# Different ways to define singleton methods #
##############################################
def test_singleton_method
animal = 'dog'
yield animal
puts animal.speak
end
#=============================================
test_singleton_method do |dog|
def dog.speak
"Woof!"
end
end
test_singleton_method do |dog|
dog.instance_eval do
def speak
"Woof!"
end
end
end
test_singleton_method do |dog|
class << dog
def speak
"Woof!"
end
end
end
test_singleton_method do |dog|
class << dog
define_method(:speak) do
"Woof!"
end
end
end
test_singleton_method do |dog|
class << dog
define_method(:speak, lambda { "Woof!" })
end
end
test_singleton_method do |dog|
module SpeakableDog
def speak
"Woof!"
end
end
class << dog
include SpeakableDog
end
end
test_singleton_method do |dog|
module SpeakableDog
def speak
"Woof!"
end
end
dog.extend SpeakableDog
end
#================ Ruby 1.9.2 ====================
test_singleton_method do |dog|
module SpeakableDog
def speak
"Woof!"
end
end
dog.singleton_class.send(:include, SpeakableDog)
end
test_singleton_method do |dog|
dog.singleton_class.class_eval do
def speak
"Woof!"
end
end
end
test_singleton_method do |dog|
dog.singleton_class.send(:define_method, :speak) do
"Woof!"
end
end
test_singleton_method do |dog|
dog.define_singleton_method(:speak) do
"Woof!"
end
end
test_singleton_method do |dog|
dog.singleton_class.send(:define_method, :speak, lambda { "Woof!" })
end
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