#!/usr/bin/env ruby
require 'pp'

class Song
   attr_reader :name, :pos

   def initialize(name, pos)
      @name = name
      @pos  = pos
   end

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

   end

end

list = []
list << Song.new("abc", 5)
list << Song.new("bcd", 2)
list << Song.new("cde", 1)
list << Song.new("def", 3)
list << Song.new("efg", 4)

pp list.sort