From: Stefan Arentz <stefan.arentz@...>
Date: 2003-07-08T10:21:42+09:00
Subject: Code Snippet: Array.shuffle


Here is another small Ruby code snippet that extends the Array class. Use
this to randomize the order of all entries in an Array.

 class Array
   def shuffle
     self.each_index { |i| r = rand(self.length - 1);
         self[i],self[r] = self[r],self[i] }
   end
 end

Works like this:

 a = Array[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 a.shuffle
   ==> [7, 10, 9, 6, 4, 8, 5, 3, 1, 2]

S.