title: More efficient Ruby way to map attribute in array of objects to another array?
body: <p>I won't repeat my question here, but is there are more efficient way to write this?</p>
  
  <pre><code>  def recruits_names
      names = []
      for r in self.referrals do
        names &lt;&lt; r.display_name
      end
  
      return names
    end
  </code></pre>