title: How to get a hash value by numeric index
body: <p>Have a hash:   </p>
  
  <pre><code>h = {:a =&gt; "val1", :b =&gt; "val2", :c =&gt; "val3"}
  </code></pre>
  
  <p>I can refer to the hash value:  </p>
  
  <pre><code>h[:a], h[:c]
  </code></pre>
  
  <p>but I would like to refer by numeric index:  </p>
  
  <pre><code>h[0] =&gt; val1
  h[2] =&gt; val3
  </code></pre>
  
  <p>Is it possible? </p>