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Ports - Ari #16

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12 changes: 9 additions & 3 deletions lib/factorial.rb
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Original file line number Diff line number Diff line change
@@ -1,6 +1,12 @@
# Computes factorial of the input number and returns it
# Time complexity: ?
# Space complexity: ?
# Time complexity: O(n), where n is the value of the number.
# Space complexity: O(n), where n is the value of the number.
def factorial(number)
raise NotImplementedError
if number == 0
return 1
elsif number.nil?
raise ArgumentError, "This value is nil."

end
return number * factorial(number - 1)
end