<h3>output</h3>
<pre><code>'App'
'A'
'B'
'C'
'D'
'App'
'A'
'B'
'C'
'D'
</code></pre>
<h3>Reasoning</h3>
<p>following is the flow of code:
Code column shows which part of the code is causing rendering, Renders column shows the component that is getting rendered and Console output column shows the console output</p>
<p>when react calls App() the App component gets render and so first console output is App, then it calls for A =&gt; B =&gt; C , then D separately, logging A B C and D respectively.</p>
<p>When useEffect is called it updates the state once again since the dependency array is empty.</p>
<table>
<thead>
<tr>
<th>Code</th>
<th>Renders</th>
<th>Console output</th>
</tr>
</thead>
<tbody>
<tr>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>App is rendered  useState(0) sets state</td>
<td></td>
<td>App A B C D</td>
</tr>
<tr>
<td>useEffect called causing rerender</td>
<td></td>
<td>App A B C D</td>
</tr>
</tbody>
</table>

React-Re_render 3 Reasoning

What does the code snippet to the right output by console.log?…