title: How to randomly sort (scramble) an array in Ruby?
body: <p>I'd like to have my array items scrambled.
  Something like this:</p>
  
  <pre><code>[1,2,3,4].scramble =&gt; [2,1,3,4]
  [1,2,3,4].scramble =&gt; [3,1,2,4]
  [1,2,3,4].scramble =&gt; [4,2,3,1]
  </code></pre>
  
  <p>and so on, randomly</p>