Update both instance variable and class variable : Class Variables « Class

Update both instance variable and class variable : Class Variables « Class « Ruby

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Ruby » Class » Class Variables

Update both instance variable and class variable



class Song

  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

    "Song: #@name--#@artist (#@duration)"

  end

  def play

    @plays  += 1   # same as @plays = @plays + 1

    @@plays += 1

    "This  song: #@plays plays. Total #@@plays plays."

  end

end



s1 = Song.new("Song1", "Artist1", 234)  # test songs..

s2 = Song.new("Song2", "Artist2", 345)

s1.play

s2.play

s1.play

s1.play

Related examples in the same category

1.	Creating Class Variables
2.	Class variable and instance variable with the same name

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