title: How to elegantly rename all keys in a hash in Ruby?
body: <p>I have a Ruby hash:</p>
  
  <pre><code>ages = { "Bruce" =&gt; 32,
           "Clark" =&gt; 28
         }
  </code></pre>
  
  <p>Assuming I have another hash of replacement names, is there an elegant way to rename all the keys so that I end up with:</p>
  
  <pre><code>ages = { "Bruce Wayne" =&gt; 32,
           "Clark Kent" =&gt; 28
         }
  </code></pre>