Vue JS Top 7 questions can help YOU crack the interview of Front-end

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Vue.js has quickly risen to prominence as one of the leading JavaScript frameworks for building modern, dynamic web applications. With its intuitive reactivity system and component-based architecture, Vue.js is a favorite among developers aiming to create powerful user interfaces. As you prepare for a Vue.js interview, here are 15 crucial questions along with code snippets to help you grasp the concepts and showcase your expertise.

1. What is Vue.js?

Vue.js is a progressive JavaScript framework designed for building user interfaces. Its core library focuses on the view layer, making it easy to integrate with other libraries or existing projects.

Answer: Vue.js is a progressive framework for building user interfaces. It's designed to be approachable and versatile.

2. How does Vue.js differ from other frameworks like React or Angular?

Unlike other frameworks that require an all-in approach, Vue.js is incrementally adoptable. This means you can introduce Vue.js into a project gradually, integrating it with existing codebase without overhauling the entire application.

Answer: Vue.js differs by being incrementally adoptable, making it seamless to integrate with existing projects.

3. What is a Vue instance?

A Vue instance is a fundamental part of Vue.js applications. It's created by instantiating the Vue constructor and serves as the entry point for defining data, methods, computed properties, and lifecycle hooks.

Answer: A Vue instance is created using the new Vue() constructor and is the root of the component tree.

javascriptCopy code
var vm = new Vue({
  data: {
    message: "Hello, Vue!"
  },
  methods: {
    greet() {
      console.log(this.message);
    }
  }
});

4. Explain data binding in Vue.js.

Data binding in Vue.js establishes a connection between the data in a Vue instance and the DOM elements in the template. This ensures that changes in data are reflected in the UI and vice versa.

Answer: Data binding in Vue.js connects data in the Vue instance to the DOM. Interpolation binds data values into text, while directives like v-bind and v-model handle attribute and two-way bindings.

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<div>{{ message }}</div>
<input v-bind:value="message">
<input v-model="message">

5. How does Vue.js implement reactivity?

Vue.js employs a reactivity system that tracks changes to data and automatically updates the DOM accordingly. It uses the Object.defineProperty method to intercept property access and apply reactive transformations.

Answer: Vue.js uses a reactivity system based on property getters and setters to track and update data changes.

javascriptCopy code
var data = { count: 0 };
var vm = new Vue({
  data: data
});

vm.count++; // Triggers automatic DOM update

6. What are directives in Vue.js?

Directives are special attributes with the v- prefix that provide declarative syntax for applying dynamic behavior to HTML elements. They enable you to build dynamic templates with minimal JavaScript code.

Answer: Directives are special attributes that begin with v- and allow you to apply dynamic behavior to HTML elements.

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<p v-if="seen">Now you see me</p>
<a v-bind:href="url">Visit Google</a>
<input v-model="message">

7. Explain Vue.js templates.

Vue.js templates are declarative HTML structures that provide the foundation for rendering the UI. They can include expressions, directives, and even components to build dynamic and interactive views.

Answer: Vue.js templates are HTML-based and include placeholders for data binding, directives, and dynamic content rendering.

htmlCopy code
<div>
  <p>{{ message }}</p>
  <button v-on:click="increment">Increment</button>
</div>

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