import { useState, useEffect } from 'react'; export default function App() { console.log('1'); useEffect(() => { console.log('2'); }, []); return <Child />; } function Child() { console.log('3'); useEffect(() => { console.log('4'); }, []); return <div>Bcraft</div>; }

When executing this code, the console output will be in the following order:

1
3
2
4

Explanation:

• When rendering the App component, console.log('1') is executed first.
• Then, the Child component is rendered, where console.log('3') is called.
• After the rendering is complete, React calls the useEffect hooks in the order they are declared, but only after the components are mounted.
• First, the effect from App (console.log('2')) runs, then the effect from Child (console.log('4')).

Thus, the synchronous logs occur in the order of function calls, and the effects run after rendering, in the order they are declared.