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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