title: What does two colons inside an angular expression {{::}} mean?
body: <p>What is the difference between:</p>
  
  <pre><code>{{::office.name}}
  </code></pre>
  
  <p>and </p>
  
  <pre><code>{{office.name}}
  </code></pre>
  
  <p>in angularJS?</p>