onBeforeMount and onBeforeUnmount in Vue - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a function before the component mounts.

Vue

<script setup>
import { onBeforeMount } from 'vue'

onBeforeMount(() => {
  console.log([1])
})
</script>

Drag options to blanks, or click blank then click option'

AbeforeMount

Bmounted

C"Component is about to mount"

DonMount

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong lifecycle hook name.

Not passing a function to onBeforeMount.

Logging a variable that is not defined.

The onBeforeMount hook runs before the component mounts. You can put any code inside the function, like logging a message.

2fill in blank

medium

Complete the code to run cleanup code before the component unmounts.

Vue

<script setup>
import { onBeforeUnmount } from 'vue'

onBeforeUnmount(() => {
  [1]('Cleaning up before unmount')
})
</script>

Drag options to blanks, or click blank then click option'

Aalert

Bfetch

CsetTimeout

Dconsole.log

Attempts:

3 left

💡 Hint

Common Mistakes

Using alert instead of console.log.

Calling a function without parentheses.

Trying to run asynchronous code without await.

The onBeforeUnmount hook runs just before the component is removed. It's a good place to clean up resources or log messages.

3fill in blank

hard

Fix the error in the lifecycle hook import statement.

Vue

<script setup>
import { [1] } from 'vue'

[1](() => {
  console.log('Before mount')
})
</script>

Drag options to blanks, or click blank then click option'

AbeforeMount

BonBeforeMount

ConMount

Dmounted

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'beforeMount' instead of 'onBeforeMount'.

Confusing mount hooks with unmount hooks.

Misspelling the hook name.

The correct Vue lifecycle hook name to run code before mounting is onBeforeMount. The others are either incorrect or do not exist as imports.

4fill in blank

hard

Fill both blanks to log messages before mount and before unmount.

Vue

<script setup>
import { [1], [2] } from 'vue'

[1](() => console.log('Starting mount'))
[2](() => console.log('Starting unmount'))
</script>

Drag options to blanks, or click blank then click option'

AonBeforeMount

BonMounted

ConBeforeUnmount

DonUnmounted

Attempts:

3 left

💡 Hint

Common Mistakes

Using onMounted or onUnmounted instead of before hooks.

Mixing up mount and unmount hooks.

Forgetting to import both hooks.

Use onBeforeMount to run code before mounting and onBeforeUnmount before unmounting.

5fill in blank

hard

Fill all three blanks to create a component that logs before mount, before unmount, and after mount.

Vue

<script setup>
import { [1], [2], [3] } from 'vue'

[1](() => console.log('Before mount'))
[3](() => console.log('Mounted'))
[2](() => console.log('Before unmount'))
</script>

Drag options to blanks, or click blank then click option'

AonBeforeMount

BonBeforeUnmount

ConMounted

DonUnmounted

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up onMounted and onBeforeMount.

Using onUnmounted instead of onBeforeUnmount.

Not importing all three hooks.

This code uses onBeforeMount to log before mounting, onBeforeUnmount before unmounting, and onMounted after the component mounts.