Method: Integer#fact

Defined in:
lib/epitools/core_ext/numbers.rb

#fact ⇒ Object Also known as: factorial

Factorial



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# File 'lib/epitools/core_ext/numbers.rb', line 378

def fact
  if self < 0
    -(1..-self).reduce(:*)
  elsif self == 0
    1
  else
    (1..self).reduce(:*)
  end
end