From: Pat Maddox <pergesu@...>
Date: 2006-01-03T19:03:42+09:00
Subject: sort_by{rand} doesn't shuffle array

I did some searching on how to shuffle an array, and found
sort_by{rand}.  However, if I call it, it doesn't make a change to my
array at all.  I've got a class like this
class MyClass
  def initialize
    # Populate the array
    @my_array = Array.new
    ...
  end

  def shuffle!
    @my_array.sort_by{rand}
  end
end

If I call shuffle! from my code, the array's elements are still in the
order that they were created.  Why are they not being shuffled like I
want?