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# attr_writer method automatically creates one or more instance variables, with corresponding methods that set the values of each method.
class Dog
attr_reader :bark
attr_writer :bark
end
dog = Dog.new
dog.bark="Woof!"
puts dog.bark # => Woof!
dog.instance_variables.sort # => ["@bark"]
Dog.instance_methods.sort - Object.instance_methods # => [ "bark", "bark=" ]
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