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Categories / Ruby / Design Patterns

 

Modules as Singletons

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.')