Comparableの使用例

gistfile1.rb

class Employee
  attr_accessor :first_name
  attr_accessor :last_name
  attr_accessor :monthly_sales
  
  include Comparable
  # 月間売上高で社員をソート
  def <=>(other_employee)
    other_employee.monthly_sales <=> @monthly_sales
  end
  
  def to_s
    "#{@first_name} #{@last_name}: #{@monthly_sales}"
  end
end