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Vue.js Component Basics Quiz

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Question 1/15

How would you register a component globally in Vue?

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

Select your answer

Using 'register'.

Using 'Vue.component'.

Using 'Vue.directives'.

Using 'Vue.create'.

Question 2/15

What is the purpose of the 'mounted' lifecycle hook in Vue?

Select your answer

It is called after the component is added to the DOM.

It is called before the component is destroyed.

It is called after the component has been updated.

It is called when the component's data changes.

Question 3/15

What attribute is used to ensure keys are unique in lists rendered with 'v-for'?

<li v-for="item in items" :key="item.id">{{ item.name }}</li>

Select your answer

:key

:ref

:class

:id

Question 4/15

Which directive would you use to two-way bind a data property to an input element?

<!-- Vue template -->
<input v-model="username" />

Select your answer

v-bind

v-model

v-if

v-on

Question 5/15

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>

Select your answer

Using 'active-class' attribute on .

Using 'v-model'.

Using 'v-show'.

Using 'v-if'.

Question 6/15

How do you pass a string prop to a child component in Vue.js?

// Parent component template
<child-component :message="'Hello'" />

Select your answer

With 'v-if:message'.

With 'v-on:message'.

With 'v-model:message'.

With 'v-bind:message'.

Question 7/15

How can you specify a default value for a prop in Vue.js?

props: {
  myProp: {
    type: String,
    default: 'Default Value'
  }
}

Select your answer

Using the 'data' function.

Using computed properties.

Within the prop definition using 'default'.

Using the 'methods' option.

Question 8/15

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

Select your answer

To define component templates.

To register global components.

To respond to reactive data changes.

To define static properties.

Question 9/15

How does Vue handle directives that are prefixed with 'v-'?

Select your answer

They are ignored by Vue.

They are treated as custom elements.

They are special attributes with specific functionality.

They are unchangeable classes.

Question 10/15

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

Select your answer

Using Vue Components.

Using Vue Router.

Using Vuex.

Using the 'data' function.

Question 11/15

How do you conditionally apply CSS classes in Vue?

<!-- Vue template -->
<div :class="{ active: isActive, 'text-danger': hasError }"></div>

Select your answer

Using 'v-if'.

Using 'v-on'.

Using ':class'.

Using 'v-for'.

Question 12/15

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

Select your answer

created

updated

destroyed

mounted

Question 13/15

How do you handle form submissions in Vue.js?

<!-- Vue template -->
<form @submit.prevent="submitForm">
  <!-- form controls -->
</form>

Select your answer

Use ':class'.

Use 'v-if'.

Use '@submit.prevent'.

Use 'v-model'.

Question 14/15

Which directive would you use to conditionally render a piece of element?

Select your answer

v-for

v-show

v-on

v-if

Question 15/15

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

Select your answer

To declare JavaScript functionality.

To inject CSS styles.

To define the component's HTML structure.

To list dependencies.

Your Results

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Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

How would you register a component globally in Vue?

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

Available answers

Using 'register'.

Using 'Vue.component'.

Using 'Vue.directives'.

Using 'Vue.create'.

To register a component globally in Vue, use 'Vue.component()', passing the component's name and its options. This makes the component available throughout the entire application.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the 'mounted' lifecycle hook in Vue?

Available answers

It is called after the component is added to the DOM.

It is called before the component is destroyed.

It is called after the component has been updated.

It is called when the component's data changes.

The 'mounted' lifecycle hook is called after a Vue instance's component has been added to the DOM. It's commonly used for operations that require the component's elements to be present in the DOM.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

What attribute is used to ensure keys are unique in lists rendered with 'v-for'?

<li v-for="item in items" :key="item.id">{{ item.name }}</li>

Available answers

:key

:ref

:class

:id

The ':key' attribute is used in Vue.js with 'v-for' directives to ensure that items have a unique identity. This helps Vue to optimize rendering by detecting changes.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which directive would you use to two-way bind a data property to an input element?

<!-- Vue template -->
<input v-model="username" />

Available answers

v-bind

v-model

v-if

v-on

The 'v-model' directive in Vue creates a two-way data binding on form input, textarea, and select elements. The code snippet shows using 'v-model' to bind the 'username' property to an input element.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Using 'active-class' attribute on <router-link>.

Using 'v-model'.

Using 'v-show'.

Using 'v-if'.

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 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you pass a string prop to a child component in Vue.js?

// Parent component template
<child-component :message="'Hello'" />

Available answers

With 'v-if:message'.

With 'v-on:message'.

With 'v-model:message'.

With 'v-bind:message'.

You use 'v-bind' (or simply the colon ':') to pass props to a child component in Vue.js. In the code snippet, ':' is a shorthand for 'v-bind' and is binding the string 'Hello' to the 'message' prop.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you specify a default value for a prop in Vue.js?

props: {
  myProp: {
    type: String,
    default: 'Default Value'
  }
}

Available answers

Using the 'data' function.

Using computed properties.

Within the prop definition using 'default'.

Using the 'methods' option.

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

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

To define component templates.

To register global components.

To respond to reactive data changes.

To define static properties.

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 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

How does Vue handle directives that are prefixed with 'v-'?

Available answers

They are ignored by Vue.

They are treated as custom elements.

They are special attributes with specific functionality.

They are unchangeable classes.

In Vue.js, directives prefixed with 'v-' are special attributes that apply reactive behavior to the DOM. Examples include 'v-if', 'v-for', and 'v-bind'.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Using Vue Components.

Using Vue Router.

Using Vuex.

Using the 'data' function.

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

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you conditionally apply CSS classes in Vue?

<!-- Vue template -->
<div :class="{ active: isActive, 'text-danger': hasError }"></div>

Available answers

Using 'v-if'.

Using 'v-on'.

Using ':class'.

Using 'v-for'.

To conditionally apply CSS classes in Vue, you can use the ':class' binding. The provided code snippet shows how to apply 'active' and 'text-danger' classes based on the 'isActive' and 'hasError' conditions.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

created

updated

destroyed

mounted

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 13/15

😊 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

Use ':class'.

Use 'v-if'.

Use '@submit.prevent'.

Use 'v-model'.

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 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which directive would you use to conditionally render a piece of element?

Available answers

v-for

v-show

v-on

v-if

The 'v-if' directive is used for conditionally rendering elements. When the condition is false, the element and its children are not rendered.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

To declare JavaScript functionality.

To inject CSS styles.

To define the component's HTML structure.

To list dependencies.

The 'template' option in a Vue component is used to define the component's HTML structure. It describes how the component should render based on its data.