Ruby: Random sort an array

simple_array_shuffle.rb

# Random sort an array (via http://d.hatena.ne.jp/tanakaBox/20070512/1178915094)
# Not perfect, but simple.
# Usage:
#   >> (1..10).to_a.shuffle
#   => [1, 3, 2, 5, 9, 7, 6, 8, 4, 10]
class Array
  def shuffle() self.to_a.shuffle!; end
  def shuffle!() self.sort! { rand(3) - 1 }; end
end