title: JQuery / Javascript Add "id" to a <div> where class="x"
body: <p>I have a line of code which is...</p>
  
  <pre><code>&lt;div class="x"&gt;
     xyz
  &lt;/div&gt;
  </code></pre>
  
  <p>I want to write a script to find the div where class == "x", and change it to be...</p>
  
  <pre><code>&lt;div class="x" id="y"&gt;
     xyz
  &lt;/div&gt;
  </code></pre>
  
  <p><strong>any help is appreciated</strong></p>