point.rb

class Point
  include Comparable

  attr_accessor :x, :y
  def initialize(x,y)
    @x = x
    @y = y
  end

  def <=>(other)
    return -1 if self.x < other.x
    return 0 if self.x == other.x && self.y == other.y
    return 1 if self.x > other.x
  end
end

puts "different points are different #{ Point.new(1,1) != Point.new(1,2) } "
puts "same points are same #{ Point.new(1,1) == Point.new(1,1) } "