title: What is the opposite of $set in Vue.js?
body: <p>In a blog app, I'd like to show/hide comments of each post <strong>inside a loop</strong> of <code>posts</code>. I know how to show the div containing the comments by setting a <code>showComments</code> on the fly:</p>
  
  <pre><code>this.$set(post, 'showComments', true) ;
  </code></pre>
  
  <p>But I don't know how to hide the post's comments when the div is already open. What I tried is this:</p>
  
  <pre><code> if (this.$get(post, 'showComments')==true) {
         this.$set(post, 'showComments', false) ;
        return
      }
  </code></pre>
  
  <p>The code above thoes not work and I get this error:</p>
  
  <pre><code>Uncaught TypeError: this.$get is not a function
  </code></pre>
  
  <p>So I'm wondering how can I acheive this functionaliry. </p>