Vue JS Top 7 Questions for Cracking Your Front-End Interview PART 2

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8. What is a component in Vue.js?

Components in Vue.js are reusable and self-contained units that encapsulate a portion of the UI and its associated functionality. They allow you to build complex applications by composing smaller, manageable pieces.

Answer: Components in Vue.js are modular units that encapsulate UI and functionality, promoting code reusability.

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Vue.component('my-component', {
  template: '<div>A custom component</div>'
});

9. How do you communicate between parent and child components?

Parent and child components can communicate by passing props from the parent to the child. Props are custom attributes that can be accessed in the child component.

Answer: Parent components can pass data to child components using props.

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// Parent component
<template>
  <child-component message="Hello from parent"></child-component>
</template>

// Child component
<template>
  <div>{{ message }}</div>
</template><script>
export default {
  props: ['message']
}
</script>

10. What are computed properties?

Computed properties in Vue.js are functions that derive and cache values based on the reactive data they depend on. They are used to perform complex calculations while maintaining reactivity.

Answer: Computed properties are functions that dynamically compute and cache values based on reactive data.

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var vm = new Vue({
  data: {
    radius: 5
  },
  computed: {
    area() {
      return Math.PI * this.radius * this.radius;
    }
  }
});

11. Explain Vue.js watchers.

Watchers in Vue.js are used to react to changes in data that are not automatically handled by computed properties. They allow you to perform asynchronous operations or more complex logic when specific data changes.

Answer: Watchers in Vue.js allow you to perform custom actions in response to changes in data.

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var vm = new Vue({
  data: {
    message: 'Hello'
  },
  watch: {
    message(newVal, oldVal) {
      console.log('Message changed from ' + oldVal + ' to ' + newVal);
    }
  }
});

12. What is Vue Router?

Vue Router is the official routing library for Vue.js. It enables the creation of single-page applications with dynamic routing by mapping URLs to components.

Answer: Vue Router is the official routing library that enables single-page applications with dynamic routing.

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const routes = [
  { path: '/', component: Home },
  { path: '/about', component: About }
];

const router = new VueRouter({
  routes
});

13. How does Vuex work?

Vuex is a state management pattern and library for Vue.js applications. It provides a centralized store to manage the state of the entire application and enables efficient data sharing between components.

Answer: Vuex is a state management library that facilitates centralized state management in Vue.js applications.

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const store = new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++;
    }
  }
});

14. Explain Vue.js mixins.

Mixins in Vue.js are reusable options that can be merged into components. They are useful for sharing logic and options between multiple components.

Answer: Mixins are reusable options that can be merged into Vue components to share behavior.

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var myMixin = {
  created() {
    this.logMessage();
  },
  methods: {
    logMessage() {
      console.log('Mixin log: ' + this.message);
    }
  }
};

var vm = new Vue({
  mixins: [myMixin],
  data: {
    message: 'Hello from mixin'
  }
});

15. What is the Vue.js CLI?

The Vue.js Command Line Interface (CLI) is a powerful tool for scaffolding, building, and managing Vue.js projects. It provides a streamlined development workflow with features like project generation, code linting, and more.

Answer: The Vue.js CLI is a command-line tool that assists in project scaffolding, development, and build processes.

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# Create a new Vue project
vue create my-project

# Serve the project in development mode
npm run serve
# Build the project for production
npm run build

In conclusion, mastering Vue.js concepts is essential for excelling in Vue.js interviews. By understanding these key questions and practicing with code snippets, you’ll be well-prepared to demonstrate your expertise and tackle any technical challenge that comes your way. Good luck!

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