Calculating a factorial in Ruby : Fixnum extension « Number « Ruby






  1. Ruby
  2. Number
  3. Fixnum extension

Calculating a factorial in Ruby

class Fixnum
  def factorial
    (1..self).inject { |a, b| a * b }
  end
end

puts 8.factorial








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1.Simulating a Subclass of Fixnum
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3.Add double_upto method to Fixnum
4.redefine basic arithmetic