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Vue.js Interview Questions and Answers - 2025
Vue.js Interview Questions and Answers
Vue.js - Intermediate Level:
1. How do you pass data between components in Vue.js?
To pass data between components in Vue.js, you can use several methods depending on the component relationship:
- Props: For passing data from a parent component to a child component.
- Custom Events: For passing data from a child component to a parent component by emitting events.
- Vuex: For state management, allowing components to share data globally in large applications.
- Provide/Inject: For passing data from an ancestor component to a descendant, even if they aren't directly related.
- Parent Component (Passing Data with Props)
- Child Component (Receiving Data via Props)
- Props: For passing data from a parent component to a child component.
- Custom Events: For passing data from a child component to a parent component by emitting events.
- Vuex: For state management, allowing components to share data globally in large applications.
- Provide/Inject: For passing data from an ancestor component to a descendant, even if they aren't directly related.
- Parent Component (Passing Data with Props)
- Child Component (Receiving Data via Props)
2. What are slots in Vue.js?
Slots are placeholders in a component's template that permit content to be passed into them from the parent component. They empower the formation of reusable components by giving a way to insert components into predefined slots. It can be named or unnamed ('default'), allowing versatility in how content is divided. This attribute is notably valuable for forming components that need dynamic layouts, where the structure might vary depending on where the component is used.
3. How do you handle asynchronous operations in Vue.js?
Asynchronous operations are usually controlled using promises or async/await syntax.
Promises permit chaining of .then() and .catch() to handle asynchronous responses from APIs.
Instead, async/await gives a cleaner syntax by permitting asynchronous functions to be written in a synchronous style.
4. What is the watcher in Vue.js?
A watcher is a mechanism designed to notice modifications in data properties in a component.
It permits to respond to these modifications by enacting defined functions.
Syntax
Syntax
5. What is Vue-loader?
Vue Loader is a webpack loader for Vue.js that permits to write Vue components in '.vue' file format.
It empowers Vue.js applications to use Single File Components (SFCs), which encapsulate HTML, CSS, and
JavaScript into a single file. They compile these components into JavaScript modules that the browser can grasp,
easing component-based development in Vue.js projects.
6. What are the different types of directives present in Vue.js?
Vue directives, marked by the prefix v- .
These directives form a perfect connection to the Vue instance,
facilitating the formation of a responsive user interfaces that react to changes in data and user interactions.
Here are the major kinds of directives in Vue.js:
v-bind
v-model
v-for
v-on (or @)
Here are the major kinds of directives in Vue.js:
v-bind
v-model
v-for
v-on (or @)
7. What is server-side rendering (SSR) in Vue.js?
Server-side rendering in Vue.js includes rendering Vue components on the server before sending HTML to the client.
This boosts first page load execution by delivering pre-rendered content.
8. Explain features of Vue.js?
Here are some of the features of Vue.js:
- Vue.js permits building applications using components, which encapsulate both data and UI elements into reusable blocks.
- Vue.js gives built-in transition system that can apply CSS transitions and animations when elements are inserted, updated, or removed from the DOM.
- Vue.js supports server-side rendering to boost SEO and initial load times of applications.
- Vue.js permits building applications using components, which encapsulate both data and UI elements into reusable blocks.
- Vue.js gives built-in transition system that can apply CSS transitions and animations when elements are inserted, updated, or removed from the DOM.
- Vue.js supports server-side rendering to boost SEO and initial load times of applications.
9. How Do You Bind Class and Style in Vue.js?
To robustly bind classes and styles in Vue.js, use the 'v-bind' directive.
You can obtain class binding using any ':class' or 'v-bind:class'.
Use the :style or v-bind:style directive to use inline styles dynamically.
Use the :style or v-bind:style directive to use inline styles dynamically.
10. How do you optimize the performance of a Vue.js application?
To optimize Vue.js applications, fixate on lowering excessive re-renders using memoization.
- Use Vue's virtual DOM for competent updates, and enhance components with 'v-if' , 'key' attributes in 'v-for' , and lifecycle hooks like 'shouldComponentUpdate'.
- Apply lazy loading with Vue Router.
- Apply Vue DevTools for profiling, consider SSR for SEO and first load speed.
- Use Vue's virtual DOM for competent updates, and enhance components with 'v-if' , 'key' attributes in 'v-for' , and lifecycle hooks like 'shouldComponentUpdate'.
- Apply lazy loading with Vue Router.
- Apply Vue DevTools for profiling, consider SSR for SEO and first load speed.
11. What Is The Difference Between Functional And Class-based Components?
Functional components in Vue.js are stateless, and have no lifecycle hooks,
giving performance benefits for easy presentational tasks. Class-based components,
on the other hand, are sustaining full Vue features like lifecycle hooks, state management,
and more complex logic, adequate for dynamic, interactive components.
12. Explain the Concept Of Higher-order Components in Vue.js?
HOCs are functions that take a component and return a new component with boosted features.
This pattern is energized by higher-order functions in JavaScript, which are functions that work on other functions.
This pattern is energized by higher-order functions in JavaScript, which are functions that work on other functions.
13. What Are the Best Practices for Component Naming in Vue.js?
Here are certain crucial strategies for component naming in Vue.js:
Use PascalCase for Component Names: Vue assists 'PascalCase' for component names, 'PascalCase' is chosen, particularly when using ES6 import statements.
An Example: 'MyComponent.vue' . Meaningful Names: Components should be named based on their functionality.
An Example: In place of 'Button.vue' , use 'SubmitButton.vue' if the component particularly manages submit actions.
Avoid Generic Names: Avoid utilizing overly generic names like 'Button' , 'Item' , or 'List' .
These names do not express exact operations.
An Example: apply 'UserProfileCard.vue' in place of just 'Card.vue' .
Use PascalCase for Component Names: Vue assists 'PascalCase' for component names, 'PascalCase' is chosen, particularly when using ES6 import statements.
An Example: 'MyComponent.vue' . Meaningful Names: Components should be named based on their functionality.
An Example: In place of 'Button.vue' , use 'SubmitButton.vue' if the component particularly manages submit actions.
Avoid Generic Names: Avoid utilizing overly generic names like 'Button' , 'Item' , or 'List' .
These names do not express exact operations.
An Example: apply 'UserProfileCard.vue' in place of just 'Card.vue' .
14. What Are Render Functions in Vue.js?
Render function returns virtual DOM node, regularly named VNode in the Vue ecosystem,
which is an interface that permits Vue to write these objects in your browser DOM.
They include all the information necessary to work with Vue.
15. Can we call the REST API from Vue.js?
Yes, you can call REST APIs.
You can include it in your project by using the following command.
Implementing GET method using Axios in Vue JS
You can include it in your project by using the following command.
Implementing GET method using Axios in Vue JS
16. Mention some of the array change detection methods in Vue.js?
In Vue.js, some of the array change detection and mutation methods are:
push()
pop()
shift()
unshift()
sort()
reverse()
push()
pop()
shift()
unshift()
sort()
reverse()
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