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perspectivezoom/factorial.rb

Created June 13, 2012 23:33
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factorial.rb
class Numeric
def factorial()
self < 0 ? raise("You can't take the factorial of a negative number") : factorial_h(1,self)
end
def factorial_h(accum, n)
n <= 1 ? accum : factorial_h(accum * n, n -1 )
end
end
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