A little example of mixing in Comparable module

mixins2.rb

class ComputerBrand
  include Comparable
  
  attr_reader :name

  def initialize(name)
    @name = name
  end

  def <=>(other)
    return -1 if @name >  other.name
    return  0 if @name == other.name
    return  1 if @name <  other.name
  end

end

apple = ComputerBrand.new("apple")
dell = ComputerBrand.new("dell")
hp = ComputerBrand.new("hp")
microsoft = ComputerBrand.new("microsoft")

puts "Apple is better than Dell: #{apple > dell}" 
puts "Apple is better than HP: #{apple > hp}" 
puts "Apple is better than Microsoft: #{apple > microsoft}" 
puts "Dell is between Apple and HP: #{dell.between?(hp, apple)}"
puts "Microsoft is worse than HP: #{microsoft <= hp}"
puts "Microsoft is better than Microsoft: #{microsoft > microsoft}"
puts "Microsoft is worse than Microsoft: #{microsoft < microsoft}"