factorial.rb in facets-1.2.0

- old
+ new
@@ -1,61 +2 @@
-#--
-# Credit: Malte Milatz
-#++
-
-class Integer
-
-  # Calculate the factorial of an integer.
-  #
-  #   2.factorial  #=> 2
-  #   3.factorial  #=> 6
-  #   3.factorial  #=> 24
-  #
-
-  def factorial
-    return 1 if zero?
-    f = 1
-    2.upto(self) { |n| f *= n }
-    f
-  end
-
-  #--
-  # TODO Pick one of these and deprecate the other. But which?
-  #++
-  alias_method( :fac, :factorial )
-  alias_method( :fact, :factorial )
-
-  #-- OLD CODE
-  #def factorial
-  #  return 1 if self == 0
-  #  #self == 0 ? 1 : ( self * (self-1).factorial )
-  #  f = (1..self.abs).inject { |state, item| state * item }
-  #  return self < 0 ? -f : f
-  #end
-  #++
-
-end
-
-
-#  _____         _
-# |_   _|__  ___| |_
-#   | |/ _ \/ __| __|
-#   | |  __/\__ \ |_
-#   |_|\___||___/\__|
-#
-=begin test
-
-  require 'test/unit'
-
-  class TCInteger < Test::Unit::TestCase
-
-    def test_factorial
-      assert_equal(  1, 0.factorial )
-      assert_equal(  1, 1.factorial )
-      assert_equal(  2, 2.factorial )
-      assert_equal(  6, 3.factorial )
-      assert_equal( 24, 4.factorial )
-    end
-
-  end
-
-=end
+require 'facets/core/integer/factorial.rb'
\ No newline at end of file