title: ColdFusion: More efficient structKeyExists() instead of isDefined()
body: <p>Which of these is more efficient in ColdFusion?</p>
  
  <pre><code>isDefined('url.myvar')
  </code></pre>
  
  <p>or</p>
  
  <pre><code>structKeyExists(url, 'myvar')
  </code></pre>