Add double_upto method to Fixnum : Fixnum extension « Number « Ruby

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Ruby » Number » Fixnum extension   Add double_upto method to Fixnum class Fixnum   def double_upto(stop)     x = self     until x > stop       yield x      x = x * 2     end   end end 10.double_upto(50) { |x| puts x } # 10 # 20 # 40   Related examples in the same category 1.  Calculating a factorial in Ruby 2.  Simulating a Subclass of Fixnum 3.  NoMethodError: undefined method 'new' for Fixnum:Class 4.  redefine basic arithmetic

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