Comparison operator : Comparable « Collections « Ruby

1. Ruby
2. Collections
3. Comparable

Comparison operator

class CD
  include Comparable
  @@plays = 0
  attr_reader :name, :artist, :duration
  attr_writer :duration
  def initialize(name, artist, duration)
    @name     = name
    @artist   = artist
    @duration = duration
    @plays    = 0
  end
  def to_s
    "CD: #@name--#@artist (#@duration)"
  end
  def <=>(other)
    self.duration <=> other.duration
  end
end

 

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