Essential Books

Extending an existing class

suggest change 
class String
  def fancy
    "~~~{#{self}}~~~"
  end
end

puts "Dorian".fancy # => "~~~{Dorian}~~~"
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Monkey patching:
* Monkey Patching in Ruby
* Changing an existing ruby method
* Changing a method with parameters
* Safe Monkey patching with Refinements
* Changing any method
* Extending an existing class
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