Question
What does the code snippet to the right output by console.log?
React quiz · 25
Question
Code
1// This is a React Quiz from BFE.dev
2
3import * as React from 'react'
4import { useState, useEffect, useLayoutEffect, useInsertionEffect} from 'react'
5import { createRoot } from 'react-dom/client'
6
7function App() {
8 console.log(1)
9 const [state, setState] = useState(0)
10 useEffect(() => {
11 setState(state => state + 1)
12 }, [])
13
14 useEffect(() => {
15 console.log(2)
16 return () => {
17 console.log(3)
18 }
19 }, [state])
20
21 useEffect(() => {
22 console.log(4)
23 return () => {
24 console.log(5)
25 }
26 }, [state])
27
28 useLayoutEffect(() => {
29 console.log(6)
30 return () => {
31 console.log(7)
32 }
33 }, [state])
34
35 useInsertionEffect(() => {
36 console.log(8)
37 return () => {
38 console.log(9)
39 }
40 }, [state])
41 console.log(10)
42 return null
43}
44
45const root = createRoot(document.getElementById('root'));
46root.render(<App/>)