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Sockets -Maria #37

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Sockets -Maria #37

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18 changes: 15 additions & 3 deletions lib/factorial.rb
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Original file line number Diff line number Diff line change
@@ -1,6 +1,18 @@
# Computes factorial of the input number and returns it
# Time complexity: ?
# Space complexity: ?
# Time Complexity: O(n) multiplies each number
# Space Complexity: O(1) one variable, no additional space taken

def factorial(number)
raise NotImplementedError
if number == nil
raise ArgumentError.new("Not an integer")
end

factorial = 1

while number >= 1
factorial *= number
number -= 1
end

return factorial
end