vue js interview questions and Answers
Whether you are a multiyear experienced VUE JS developer or a fresher with the wish to reach new milestones of success in this niche, going through this expert advice content consisting vital VUE JS interview questions with answers, and other practice-oriented details can be extremely helpful. VUE JS is an open source and progressive JavaScript framework for building advanced user interfaces. It is designed to be incrementally adoptable. The core library of VUE JS is based on the view layer only and easy to integrate with existing projects and other libraries.
Most Frequently Asked vue js interview questions
In VUE JS, Props are the process in which developers pass data from a parent component to its child components (downward). The Props are added to the components in the section of the code.
Here, we are passing the prop “cool-prop” a value of “EXAMPLE”, which can be accessed from inside of my-component.
Virtual DOM is a data structure present in JavaScript. With this, the code will make changes to only the JS object, which makes it a budget suited option. Not only performance enhancement, but virtual DOM also offers additional functionality such as bypassing the need for a template property or an HTML template by using render() method.
It also offers users JavaScript’s programmatic power, flexibility to make code universal, JS extensions operation, and plenty more. Virtual DOM is an important chapter of VUE JS, which represents many VUE JS interview questions.
Developers use mixins in VUE JS to flexibly distribute reusable functionalities to distribute reusable functionalities. Mixins can contain any component options. Mixins can be maintained in one place so that all the components using it can be benefitted at the same time. Using it, we can also build a consistent API with component present throughout the app.
To deploy a VUE JS application, we have to use the following
syntax:-
npm run build
To use routing in VUE JS, we have to follow the below mentioned steps.
- Create three component files, as shown below.
// Home.vue
<template>
<h1>Home</h1>
</template>
<script>
export default {
}
</script>
- Now, create About.vue file with the following syntax.
// About.vue
<template>
<h1>About us</h1>
</template>
<script>
export default {
}
</script>
- Create the Contact.vue file with the below mentioned syntax.
// Contact.vue
<template>
<h1>Contact us</h1>
</template>
<script>
export default {
}
</script>
- To proceed, now update the update index.html file and continue by adding app id attribute.
- Import the Vue-router module in the main.js file from a node_modules folder and copy the below-mentioned code to the main.js file.
// main.js
import Vue from 'vue';
import VueRouter from 'vue-router';
Vue.use(VueRouter);
import Home from './components/Home.vue';
import About from './components/About.vue';
import Contact from './components/Contact.vue';
const router = new VueRouter({
mode: 'history',
base: __dirname,
routes: [
{ path: '/', component: Home },
{ path: '/about', component: About },
{ path: '/contact', component: Contact }
]
});
new Vue({
router,
template: `
<div>
<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item"><router-link to="/" class="nav-link">Home</router-link></li>
<li class="nav-item"><router-link to="/about" class="nav-link">About</router-link></li>
<li class="nav-item"><router-link to="/contact" class="nav-link">Contact</router-link></li>
</ul>
</div>
</nav>
<router-view class="view"></router-view>
</div>
}).$mount('#app');
- Run the code and get the final output.
In VUE JS, Lifecycle hooks are defined methods that get executed in a certain stage of VUE object lifespan. These act as a window into how the library that developers are using behind the scenes.
It’s a Webpack loader used to author VUE components in a Single-File Components (SFCs) format. Webpack and VUE-loader together ensure fast workflow for the development of VUE.JS applications.
Development History
Developed by former Google employee Evan You, VUE JS was initially released in February 2014. With continuous improvement and feature addition over the year, VUE JS is currently operating its version 2.6 released in Feb 2019 with the title of Macross.
Let’s further continue to discuss a set of most interviewer-preferred VUE JS interview questions with answers for your acknowledgment and practice. For your confirmation, these questions are handpicked by niche experts and accompanied here with their best-suggested answers.
Advantages:
- Extremely small in size (18–21KB), so easy to download and use it instantaneously. It’s small in size that doesn’t mean you have to compromise with speed. In fact, it beats most of the bulky frameworks such as Angular, Reacts and Ember.
- User-friendly, easy to understand, and develop apps.
- It facilitates developers to integrate with the existing applications built on JavaScript. This is possible because of the availability of components in VUE JS for everything.
- VUE JS offer comprehensive documentation, which is even easily understandable to users with very little knowledge of HTML and JavaScript.
- Because of MVVM architecture, VUE JS facilitates two-way communications, which makes HTML block handling easier.
- Users can write their own template in JavaScript and HTML file using virtual nodes.