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Defining methods in an included module inside your class allows modification by modules later.
class Dog
module InstanceMethods
def bark
"Arf arf!"
end
end
include InstanceMethods
end
dog = Dog.new
dog.bark
#=> "Arf arf!"
module JapaneseBark
def bark
"Won won!"
end
end
Dog.send :include, JapaneseBark
dog = Dog.new
dog.bark
#=> "Won won!"
# This is versus:
class Cat
def meow
"Mew!"
end
end
cat = Cat.new
cat.meow
#=> 'Mew!'
module JapaneseMeow
def meow
'Nya!'
end
end
Cat.send :include, JapaneseMeow
cat = Cat.new
cat.meow
#=> 'Mew!'
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