Design Patterns Ruby

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module ModuleBasedLogger
  ERROR = 1
  WARNING = 2
  INFO = 3
  @@log = File.open("log.txt", "w")
  @@level = WARNING
  def self.error(msg)
    @@log.puts(msg)
    @@log.flush
  end
end
ModuleBasedLogger.error('Computer wins chess game.')