title: How to find element by Key in React?
body: <pre><code>&lt;ul&gt;
      &lt;li key='search1'&gt;1234&lt;/li&gt;
      &lt;li key='search2'&gt;5678&lt;/li&gt;
      &lt;li key='search3'&gt;9&lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>How to find element by Key and change element values like addClass/innerHtml?</p>
  
  <p>Note: In Plain React - No Flux or Jsx.</p>