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class Employee                      class Employee
  def initialize                      def emails
    @emails = []          =>            @emails ||= []     
  end                                 end
end                                 end

• Move the initialization logic to the attribute getter.
• Test

class Employee
  attr_reader :emails

  def initialize
    @emails = []
  end
end

class Employee
  def emails
    @emails ||= []
  end
end