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  1. Write code
  2. Refactor code
  3. Extract refactorings
  4. Extract superclass

Extract superclass

Last modified: 25 April 2023

Refactor | Extract/Introduce | Superclass

The Extract Superclass refactoring allows you to extract certain members from a selected class into a new base class. The original class will be inherited from the created base class.

To extract a superclass:

Example

Before

# 'cat.rb' file
class Cat
    def breathe
        puts "inhale and exhale"
    end
    def speak
        puts "Meow"
    end
end

After

# 'cat.rb' file
require_relative 'mammal.rb'
class Cat < Mammal
    def speak
        puts "Meow"
    end
end
#
# 'mammal.rb' file
class Mammal < Object
    def breathe
        puts "inhale and exhale"
    end
end