Vue JS Interview Questions and Answers

If you are looking for the interview questions on Vue JS, you are at the right place. We have listed some of the frequently asked important Vue JS interview questions and answers to make your interview process simple.

Q1. What is Vue.js?

Ans: Vue JS is basically pronounced as view, it is progressive framework useful in building UI’s.

Vue.js is small, versatile and approachable framework. If you are aware of CSS, HTML and JavaScript then you are good to go with developing Vue JS apps in no time.

Q2. What are the features of VueJS?

Ans: When compared to other frameworks like Angular and React, React JS and Vue JS provide similar features. Below are some of them:

  • Make use of a virtual DOM.
  • Provide composable and reactive view components.
  • Maintain focus in the core library, with concerns such as routing and global state management.

Q3. How to create a “hello world” program in Vue JS?

Ans: To create a hello world program in Vue JS, let’s create a html and file install Vue JS:

<html>

<head>

<title>Vue JS Hello World</title>

</head>

<body>

<body>

<script src=”https://unpkg.com/vue”></script>

<html>

We have added Vue JS successfully to our application, now we need to create an element:<div id=”root”></div>

Now we can create a new view instance:

<script src=”https://unpkg.com/vue”></script>

<script type =”text/javascript”>

Var App = new Vue({

el:”#root”,

data:{

message:”Hi”,

}

});

</script>

Now, you can see that Vue JS app is added to the “root” id, you can use class too for the el property. Now you can change message to “Hello World”.

var App = new Vue({

el: “#root”,

Data:{

message:”Hello World!”,

}

});

This will change the message value and displays the output as: Hello World!.

<script type =”text/javascript”>

Var App = new Vue({

el:”#root”,

data:{

message:”Hi”,

}

});

</script>

Now, you can see that Vue JS app is added to the “root” id, you can use class too for the el property. Now you can change message to “Hello World”.

var App = new Vue({

el: “#root”,

Data:{

message:”Hello World!”,

}

});

This will change the message value and displays the output as: Hello World!.

Q4. How to install Vue JS?

Ans: Vue JS can be installed using CDN, this process is fast, flexible and simple method. You can import Vue JS by using the following syntax:

Syntax: “<script src=”https://unpkg.com/vue”></script>”

Q5. What are HTML declarations in Vue JS?

Ans: Vue enables you to make use of HTML tags and attributes to manage and alter the view of the application. This includes setting attributes dynamically like href and alt. Vue allows you to render components and tags based on the data in the application.

Q6. What is mixin?

Ans: Mixin allows us to write reusable and pluggable functionalities for components in Vue. If are equipped with a set of components like methods and lifecycle hooks etc. which you wanted to use across multiple components, you can define it as mixin and simply reference it in the component.

Q7. What is a virtual DOM?

Ans: The “Virtual Document Object Model” or v-DOM is extremely different than the actual DOM. The v-DOM is an in memory representation of the underlying node (data structures) that the Vue js runtime engine processes different checks against prior to actually inform the DOM that an update is needed.

Q8. What is a Vue plugin?

Ans:  A Vue plugin helps developers in building and adding a global level functionality to Vue. This can be used to write globally accessible properties and methods, options, assets, mixins and other custom API’s to an application.

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