There are a lot of things to consider when you hire vue js developer to make sure if an individual is per your requirements or not. Therefore, to get a clear understanding of the skillset and knowledge possessed by a candidate you need to ask these interview questions from vuejs developer.
What are some of the most-used directives in Vue?
Below, a few directives are briefed that our Vuejs developers use.
v-show: A bit similar to the v-if statement, but renders all the elements to the DOM and later uses the CSS property to display/hide elements.
v-if: adds or removes DOM (Document Object Model) elements based on relatable expressions.
v-else: It displays the content message only when the expression adjacent to v-if resolves to invalid.
v-for: makes a loop through items in an array.
v-model: it is used for two-way data binding.
What is the Vue.js application instance?
If you must know the application instances are used to register globals in order to make them usable for components within the application. Hence, most instances are created with the ‘create-app’ common (as shown in the code given below).
const app = Vue.createApp({
/* options */
});
How to optimize Vue.js performance?
For businesses that have their profiles or applications built on the Vue.Js framework, we have Vue.Js developers for hire to optimize their applications impeccably.
For instance, the problems that make your software slow are:
- Multiple third-party libraries are used.
- Un-optimized images and compressed files
- No function is deployed to avoid duplicate code.
Vue.Js developers at our software development company implement these strategies to get over the issues:
- Minimize the dependency on third-party library files.
- Normalize re-using functionalities.
- Optimize all types of images like local images and CDN images.
Explain the concept of Vue components and their lifecycle hooks.
There are multiple lifecycle hooks associated with the vue components that help developers in the code execution process. Following are some of the widely used hooks that are utilized at different stages of a component’s lifecycle.
created: This hook is called once the component is created. It is often used for initializing data or making API requests.
mounted: This hook is called when the component is inserted into the DOM. It is commonly used for accessing the DOM or setting up third-party libraries.
updated: This hook is called after a component’s data changes and the virtual DOM re-renders and patches the real DOM. It is useful for performing additional actions after an update.
destroyed: This hook is called when a component is destroyed and removed from the DOM. It allows for performing cleanup tasks and releasing resources.
How to communicate between two child components in Vue JS?
These are a few mechanisms vue js developers can use for inter-component communication while using this technology.
Props: It allows the parent components can pass data to child components using props that are reactive, and changes in the parent component will trigger updates in the child component.
Events: Child components can emit events using 
, and parent components can listen to these events using 
the shorthand 
. This engages the child component with the parent components.
Vuex: This state management library for Vue.js applications provides a centralized store to manage the state of the application and enables communication between components through a shared state.
How does the Vue JS router work?
Vue Router is the official routing library for Vue.js applications, enabling the creation of single-page applications with client-side routing. Here is a breakdown of how Vue Router works and how routes can be defined in a Vue.js application:
Installation
Start by installing Vue Router using npm or yarn, which involves adding the package as a dependency in your project.
Configuration
After installation, import Vue Router into your application and create an instance of the router. Within the router configuration, you define the routes for your application.
Route Mapping
Each route is represented as an object with properties such as “path” (indicating the URL path), “component” (specifying the Vue component to render for that route), and optional metadata.
Router Initialization
Mount the router instance to your Vue application by providing it as an option in the Vue instance. This step makes the router accessible to all components within your application.
Route Navigation
To navigate between routes, Vue Router offers the <router-link> component. It can be used in your templates, specifying the desired route path, and will be rendered as an anchor tag.
Route Rendering
The <router-view> component serves as a placeholder in your application’s template. It dynamically renders the component associated with the current route, allowing for seamless content switching.
Programmatic Navigation
In addition to using <router-link> for navigation, you can programmatically navigate through the router’s API. For instance, you can utilize this.$router.push() to navigate to a specific route programmatically.
What are mixins in Vue.js?
Mixins in Vue.js encapsulate and share reusable functionality between components. They allow you to define reusable code snippets, such as computed properties, methods, and lifecycle hooks, which can be mixed into multiple components.
When to use mixins?
Code Reusability
Mixins are useful when you have common functionality that needs to be shared across multiple components. Instead of duplicating the code in each component, you can define it once in a mixin and then mix it into the components that need it.
Cross-Component Communication
They facilitate communication between components by providing shared methods or event-handling logic.
Enhancing Component Behavior
Mixins can be used to augment component behavior by adding additional methods, computed properties, or lifecycle hooks.
What are some potential drawbacks to consider when using mixins?
Name Clashes and Order Dependency
When multiple mixins are used, conflicts can arise if they define properties or methods with the same name. Additionally, the order in which mixins are mixed into a component can affect the final behavior, potentially leading to unexpected results.
Implicit Dependencies
Mixins introduce implicit dependencies, as components may rely on functionality provided by mixins. This can make it harder to understand and reason about the codebase, especially when mixins are shared across multiple components.
Code Complexity and Maintenance
Overuse of mixins can make the codebase more complex and harder to maintain. With multiple mixins and their associated functionality, it can become challenging to track down issues or understand the complete behavior of a component.
Reduced Readability
Mixins can make the code less readable and make it harder to understand where certain functionality originates from, especially if there are multiple mixins involved.
