Vue.js Component Basics Quiz

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Question 1/15

What is a Vuex store used for in a Vue.js application?

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Question 2/15

How do you emit an event from a child component in Vue?
// In child component
this.$emit('myEvent', payload);

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Question 3/15

What is a Vue component's 'name' option used for?

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Question 4/15

How do you handle form submissions in Vue.js?
<!-- Vue template -->
<form @submit.prevent="submitForm">
  <!-- form controls -->
</form>

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Question 5/15

When would you use a 'watcher' in Vue.js?

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Question 6/15

What is the syntax for creating a computed property in Vue?
computed: {
  reversedMessage() {
    return this.message.split('').reverse().join('');
  }
}

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Question 7/15

How can you specify a default value for a prop in Vue.js?
props: {
  myProp: {
    type: String,
    default: 'Default Value'
  }
}

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Question 8/15

What is the purpose of the 'data' function in a Vue component?

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Question 9/15

What does the 'props' option in a Vue component do?

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Question 10/15

What is a scoped slot in Vue?
<template #default="slotProps">
  <span>{{ slotProps.text }}</span>
</template>

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Question 11/15

What lifecycle hook would you use to fetch data when a component is created?

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Question 12/15

How do you create a dynamic component in Vue?
<!-- Vue template -->
<component :is="currentComponent"></component>

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Question 13/15

How do you configure a CSS class for an active state using Vue Router?
<router-link to="/home" active-class="active-link">Home</router-link>

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Question 14/15

How do you bind a JavaScript variable to an HTML element in a Vue template?

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Question 15/15

How can you centrally manage your application's state in Vue.js?

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Your Answers

Question 1/15
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What is a Vuex store used for in a Vue.js application?

Available answers

A Vuex store is a centralized state management solution for Vue.js applications. It allows for managing the global state across components to keep data in sync and consistent.
Question 2/15
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How do you emit an event from a child component in Vue?
// In child component
this.$emit('myEvent', payload);

Available answers

To emit an event from a child component in Vue, use 'this.$emit()' inside the child component. This allows the parent component to listen for the event. In the code snippet, 'myEvent' is the event emitted with a 'payload'.
Question 3/15
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What is a Vue component's 'name' option used for?

Available answers

The 'name' option in a Vue component provides an identifier primarily used for debugging and in tools like Vue DevTools. It also helps with recursive components.
Question 4/15
😊 Your answer was correct 🙁 Your answer was incorrect
How do you handle form submissions in Vue.js?
<!-- Vue template -->
<form @submit.prevent="submitForm">
  <!-- form controls -->
</form>

Available answers

Form submissions in Vue.js can be handled by listening to the 'submit' event using '@submit'. Adding '.prevent' modifier prevents the default browser behavior, allowing you to handle the submission with the specified method.
Question 5/15
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When would you use a 'watcher' in Vue.js?

Available answers

A 'watcher' in Vue.js is used to perform actions in response to changes in a reactive data property. Watchers are useful for async operations or when data changes require more complex logic.
Question 6/15
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What is the syntax for creating a computed property in Vue?
computed: {
  reversedMessage() {
    return this.message.split('').reverse().join('');
  }
}

Available answers

Computed properties in Vue are defined within the 'computed' option of a component. They are cached based on their reactive dependencies and only re-evaluate when necessary. The provided code snippet shows an example of a computed property 'reversedMessage'.
Question 7/15
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How can you specify a default value for a prop in Vue.js?
props: {
  myProp: {
    type: String,
    default: 'Default Value'
  }
}

Available answers

In Vue.js, you can specify a default value for a prop by including a 'default' field within the prop definition. The provided code snippet shows how to set 'Default Value' as the default for 'myProp'.
Question 8/15
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What is the purpose of the 'data' function in a Vue component?

Available answers

The 'data' function in a Vue component returns an object. This object is reactive, meaning that Vue will automatically update the DOM when these properties change. It is used to store the component's state.
Question 9/15
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What does the 'props' option in a Vue component do?

Available answers

The 'props' option in a Vue component is used to declare properties that can be passed from the parent component. These props allow the component to be more flexible and dynamic.
Question 10/15
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What is a scoped slot in Vue?
<template #default="slotProps">
  <span>{{ slotProps.text }}</span>
</template>

Available answers

A scoped slot is a Vue slot that allows you to pass data from the child component back to the parent using the 'slot-scope' or newer shorthand syntax ('#'). The provided code snippet is an example where 'slotProps.text' is used.
Question 11/15
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What lifecycle hook would you use to fetch data when a component is created?

Available answers

The 'created' lifecycle hook is invoked when a Vue instance is created. It is a good place to fetch data because the component is fully initialized but not yet mounted.
Question 12/15
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How do you create a dynamic component in Vue?
<!-- Vue template -->
<component :is="currentComponent"></component>

Available answers

Dynamic components in Vue are created with the '' syntax. The 'is' attribute determines which component to render, allowing for dynamic rendering based on changing data.
Question 13/15
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How do you configure a CSS class for an active state using Vue Router?
<router-link to="/home" active-class="active-link">Home</router-link>

Available answers

In Vue Router, you can configure a CSS class for an active link state using the 'active-class' attribute on a . The code snippet sets a class named 'active-link' for the active link to '/home'.
Question 14/15
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How do you bind a JavaScript variable to an HTML element in a Vue template?

Available answers

In Vue templates, you use the double curly braces ({{ }}) to bind JavaScript expressions to HTML elements. This is known as interpolation.
Question 15/15
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How can you centrally manage your application's state in Vue.js?

Available answers

In Vue.js, the centralized state management can be achieved using Vuex, which is an official state management pattern + library for Vue.js applications.