title: what's the advantage of using ref versus id when referencing the input value
body: <p>what's the advantage of using:</p>
  
  <pre><code>this.refs.id.value
  </code></pre>
  
  <p>versus using:</p>
  
  <pre><code>document.getElementById('newID').value
  </code></pre>
  
  <p>is it just shorter syntax or is something else going on?</p>