title: ruby variable as same object (pointers?)
body: <pre><code>&gt;&gt; a = 5
  =&gt; 5
  &gt;&gt; b = a
  =&gt; 5
  &gt;&gt; b = 4
  =&gt; 4
  &gt;&gt; a
  =&gt; 5
  </code></pre>
  
  <p>how can I set 'b' to actually be 'a' so that in the example, the variable a will become four as well. thanks.</p>