Vue JS Foundation of Vue Js 4

Question 1

What is the purpose of a slot in a Vue component?

Accepted Answer

To allow parents to inject content into a child's template

Answer

To define reactive state

Answer

To register events

Answer

To create computed values

Question 2

Which directive outputs raw HTML and should be used cautiously?

Accepted Answer

v-html

Answer

v-text

Answer

v-bind

Answer

v-pre

Question 3

What does the watch() function let you do?

Accepted Answer

Run a callback when a reactive source changes

Answer

Cache derived state

Answer

Render a list

Answer

Bind a class

Question 4

Which event modifier prevents the default browser action?

Accepted Answer

.prevent

Answer

.stop

Answer

.once

Answer

.capture

Question 5

What does the v-once directive do?

Accepted Answer

Renders the element only one time and skips future updates

Answer

Runs a method once

Answer

Limits a loop to one iteration

Answer

Emits an event once

Question 6

How do you conditionally apply a CSS class based on a boolean in Vue?

Accepted Answer

:class="{ active: isActive }"

Answer

class="active"

Answer

@class="isActive"

Answer

v-class="isActive"

Question 7

What is the virtual DOM in Vue?

Accepted Answer

An in-memory representation of the UI used to optimize real DOM updates

Answer

A copy of the database

Answer

A browser plugin

Answer

A CSS engine