Vue JS

Vue.js is an essentially adopted progressive JavaScript framework for constructing interactive web interfaces and even single-page applications. Simple, reactive, and highly modular, this framework easily gains the developers’ trust. This is a list of must-read questions on Vue.js along with its answers that help you cement your understanding on core subjects such as components, directives, data binding, event handling, lifecycle hooks, Vue Router, and Vuex.

These multiple-choice questions cater to developers at all levels, whether you are preparing for an interview, revising concepts, or exploring advanced Vue.js features. You will get insights into how to create reusable components, how to handle state effectively, optimize the performance of an application, and leverage directives for dynamic rendering. Topics include practical implementation techniques, the advantages of reactive data models, and comparisons to other frameworks like React or Angular.

A good tool for all beginner and professional developers: not only sharpens your skills but will enable you to learn the fundamental principles that come along with Vue.js. Take the depth of knowing in regards to Vue CLI, composition API, template syntax, learning how to incorporate third-party libraries, APIs, and more for you to be able to master and create high performance web applications that scale.

Whether you’re brushing up on the basics or venturing into more advanced topics, these questions are crafted to make your learning journey seamless and enjoyable. Vue.js is shaping modern web development, and this resource will guide you in harnessing its full potential for your next project. Unlock the power of Vue.js and take your development skills to the next level!

 

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#1. What is Vue.js?

A database management system

A CSS framework

A library for backend development

A JavaScript framework for building user interfaces

#2. Who created Vue.js?

Dan Abramov

Brendan Eich

Evan You

Ryan Dahl

#3. Which directive is used for binding data in Vue.js?

v-show

v-bind

v-for

v-if

#4. What is the root element in a Vue app called?

Root Node

Root Component

App Root

Main Node

#5. How do you create a Vue instance?

new VueApp()

new Vue()

createApp()

Vue.create()

#6. Which directive is used for conditionally rendering elements?

v-show

v-if

v-bind

v-model

#7. What is the purpose of the v-for directive?

To create forms

To loop through items in an array

To conditionally render elements

To add event listeners

#8. What is Vuex used for in Vue.js?

Event handling

CSS styling

State management

Routing

#9. What is the use of the v-model directive?

To apply styles

To loop through arrays

To bind text

For two-way data binding

#10. What is the purpose of the mounted lifecycle hook?

To initialize components

To render elements to the DOM

To clean up resources

To perform operations after the DOM is updated

#11. What is the default file extension for Vue components?

.vue

.jsx

.html

.js

#12. What is the purpose of a Vue router?

To validate forms

To enable navigation between components

To handle API requests

To optimize performance

#13. Which keyword is used to define props in Vue.js?

computed

data

methods

props

#14. How do you pass data to a child component?

Using v-bind

Using props

Using slots

Using events

#15. What is the Vue Devtools browser extension used for?

Writing Vue code

Testing APIs

Managing databases

Debugging Vue applications

#16. What is the created lifecycle hook used for?

To fetch data before rendering

To initialize the Vue instance

To destroy components

To clean up resources

#17. Which directive is used to handle events in Vue.js?

v-action

v-click

v-event

@ (shorthand for v-on)

#18. How do you define reactive data in a Vue instance?

In the methods option

In the computed option

In the props option

In the data option

#19. What does the key attribute in Vue.js help with?

Rendering lists efficiently

Fetching API data

Styling components

Lifecycle management

#20. What is the Vue CLI?

A command-line interface for scaffolding Vue applications

A library for animations

A tool for testing Vue apps

A plugin for Vuex

#21. What does Vue.use() do?

Registers a plugin

Sets up the router

Declares components

Configures Vuex

#22. What is a Vue mixin?

A directive for animations

A type of Vue component

A method to mix styles

A reusable piece of Vue configuration

#23. What does the .sync modifier do?

Syncs data with the API

Updates CSS styles dynamically

Syncs state with Vuex

Syncs props and child components

#24. What is a slot in Vue.js?

A directive for animations

A method for binding data

A placeholder for dynamic content

A feature of Vuex

#25. Which Vue lifecycle hook is called after the DOM is updated?

updated

beforeUpdate

destroyed

mounted

#26. What is Vue.observable() used for?

Observing DOM changes

Creating a reactive object outside components

Fetching API data

Validating forms

#27. What does Vue.config do?

Changes global Vue settings

Manages API endpoints

Handles styling

Configures routing

#28. What is the Vue Router method to navigate programmatically?

router.navigate()

router.push()

router.go()

router.route()

#29. How do you define a method in Vue.js?

Inside the data option

Inside the props option

Inside the methods option

Inside the template

#30. Which Vue directive binds a value to an input field?

v-on

v-model

v-text

v-bind

#31. What is a scoped slot?

A slot that shares data with the parent component

A slot with conditional rendering

A reusable mixin for slots

A slot that is hidden by default

#32. What is the purpose of the watch option in Vue?

To watch for changes in props

To observe changes in the DOM

To watch for changes in data and perform actions

To manage events

#33. What does the emit method do in Vue.js?

Registers a plugin

Triggers state changes

Updates computed properties

Emits custom events from a child to a parent

#34. How do you import Vue into a JavaScript file?

load Vue from 'vue'

const Vue = 'vue'

import Vue from 'vue'

require('vue')

#35. Which directive is used for inline styles in Vue?

v-class

v-text

v-html

v-bind:style

#36. What does the this.$refs object provide?

The current Vue instance properties

A list of child components

The Vuex store

Direct references to DOM elements or child components

#37. How do you define a computed property in Vue?

Inside the computed option

Inside the props option

Inside the methods option

Inside the data option

#38. What is the difference between props and data in Vue?

Props are for parent-to-child communication; data is for internal state

Props are for child-to-parent communication; data is for templates

Props are immutable; data is reactive

Props are for global state; data is for Vuex

#39. Which Vue directive is used for custom event listeners?

v-click

v-custom

v-on

v-bind:event

#40. What does Vue.nextTick() do?

Delays API calls

Triggers lifecycle hooks

Updates the DOM immediately

Defers DOM updates until after the next tick

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