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Vue.js Composition API Quiz

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Question 1/15

Which method is used to execute a function whenever a dependency changes in the Composition API?

Select your answer

watchEffect

dependentMethod

refEffect

reactiveEffect

Question 2/15

When using the Composition API, how can you access the current instance inside a setup function?

Select your answer

Using

setupContext

parameter.

Using

getCurrentInstance()

function.

Through a Vuex store object.

Using

this

keyword directly.

Question 3/15

Which Composition API feature allows you to reuse logic across components?

Select your answer

Props

Component Methods

Provide/Inject

Composable functions

Question 4/15

How is dependency tracking achieved in Vue's Composition API?

Select your answer

Manually added by developers using

track

function.

Through Vuex store updates.

Automatically tracked using features like

reactive

and

ref

By using decorators such as

@computed

Question 5/15

Which of the following is a way to create computed properties using the Composition API?

Select your answer

Using the

useComputed

function.

Using

computed

from

'vue'

library.

By assigning a function to a data object.

Using

Vue.computed

method.

Question 6/15

How do you define a reactive state using the Composition API?

Select your answer

Using the

computed

property.

Using the

ref

reactive

function.

Using the

watchEffect

function.

Using

Vue.set

Question 7/15

What best describes a `ref` in the Vue Composition API?

Select your answer

An object that holds a reactive reference to a primitive value, making it reactive.

An array used to store reactive data sequence.

An alias for a computed property.

An object that holds a reactive reference to a value, which is deeply reactive.

Question 8/15

If you need to initialize a complex object with nested properties in the Composition API, which function should you use?

Select your answer

defineReactive

reactive

ref

initializeObject

Question 9/15

How do you use props in the setup function?

Select your answer

By directly accessing

this.$props

By accessing

props

which is passed as an argument to the `setup` function.

By declaring them with

ref

Using

Vue.useProps

Question 10/15

Which lifecycle hook is NOT available when using the Composition API?

Select your answer

onBeforeMount

beforeCreate

onBeforeUpdate

onMounted

Question 11/15

Which function can be used to stop an effect created with

watchEffect

Select your answer

stop

function can be called on the effect's return value.

You cannot stop a

watchEffect

clearEffect

function.

By returning

false

inside the effect function.

Question 12/15

How can you create a dynamic component using the Composition API?

Select your answer

By using

defineComponent()

function.

By using

reactify() to convert templates dynamically.

Using Vue's built-in

component()

directive.

By utilizing the

is

attribute with

<component>

tag and managing state dynamically in

setup

Question 13/15

Using the Composition API, how can you handle component-specific events, such as a click event?

Select your answer

Directly within the

setup

function by binding the event.

Through the

watchEffect

function.

By defining methods returned from the

setup

function, which can then be used in templates.

Using

onMounted

to define handlers directly.

Question 14/15

What is the main purpose of the Vue Composition API?

Select your answer

To simplify state management.

To organize complex logic and reuse code across components.

To enhance Vue's performance.

To create templates more efficiently.

Question 15/15

Which feature in the Composition API is designed to control and reuse async logic?

Select your answer

defineAsyncComponent

asyncSetup

useAsyncEffect

Composable functions

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which method is used to execute a function whenever a dependency changes in the Composition API?

Available answers

<pre><code>watchEffect</code></pre>

<pre><code>dependentMethod</code></pre>

<pre><code>refEffect</code></pre>

<pre><code>reactiveEffect</code></pre>

In the Composition API,

watchEffect

allows developers to run a function whenever its dependencies change, automating side effects tracking.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

When using the Composition API, how can you access the current instance inside a setup function?

Available answers

Using <pre><code>setupContext</code></pre> parameter.

Using <pre><code>getCurrentInstance()</code></pre> function.

Through a Vuex store object.

Using <pre><code>this</code></pre> keyword directly.

Inside a setup function, the current instance can be accessed using the

getCurrentInstance()

helper function, which returns the component instance.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which Composition API feature allows you to reuse logic across components?

Available answers

Props

Component Methods

Provide/Inject

Composable functions

Composable functions allow logic to be reused across different components in a Vue.js application. They can be created by exporting a function from a file where Composition API features like

ref

reactive

, or

watch

are used.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

How is dependency tracking achieved in Vue's Composition API?

Available answers

Manually added by developers using <pre><code>track</code></pre> function.

Through Vuex store updates.

Automatically tracked using features like <pre><code>reactive</code></pre> and <pre><code>ref</code></pre>.

By using decorators such as <pre><code>@computed</code></pre>.

Dependency tracking in Vue's Composition API happens automatically when using features like

reactive

and

ref

. These tools manage the necessary reactivity and dependency tracking for you.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is a way to create computed properties using the Composition API?

Available answers

Using the <pre><code>useComputed</code></pre> function.

Using <pre><code>computed</code></pre> from <pre><code>'vue'</code></pre> library.

By assigning a function to a data object.

Using <pre><code>Vue.computed</code></pre> method.

Computed properties in the Composition API are created using the

computed

function from the

'vue'

library.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you define a reactive state using the Composition API?

Available answers

Using the <pre><code>computed</code></pre> property.

Using the <pre><code>ref</code></pre> or <pre><code>reactive</code></pre> function.

Using the <pre><code>watchEffect</code></pre> function.

Using <pre><code>Vue.set</code></pre>.

In the Composition API, you can define a reactive state using the

ref

function for primitive types or

reactive

for objects.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

What best describes a `ref` in the Vue Composition API?

Available answers

An object that holds a reactive reference to a primitive value, making it reactive.

An array used to store reactive data sequence.

An alias for a computed property.

An object that holds a reactive reference to a value, which is deeply reactive.

A `ref` is an object that keeps a reactive reference to a primitive value or an object, allowing it to change reactively and can be used in templates directly by accessing

value

in JavaScript.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

If you need to initialize a complex object with nested properties in the Composition API, which function should you use?

Available answers

<pre><code>defineReactive</code></pre>

<pre><code>reactive</code></pre>

<pre><code>initializeObject</code></pre>

For initializing complex objects with nested properties in the Composition API, the

reactive

function is the appropriate choice, as it provides deep reactivity.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you use props in the setup function?

Available answers

By directly accessing <pre><code>this.$props</code></pre>.

By accessing <pre><code>props</code></pre> which is passed as an argument to the `setup` function.

By declaring them with <pre><code>ref</code></pre>.

Using <pre><code>Vue.useProps</code></pre>.

Props are accessed in the

setup

function through the

props

argument that is passed to it.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which lifecycle hook is NOT available when using the Composition API?

Available answers

<pre><code>onBeforeMount</code></pre>

<pre><code>beforeCreate</code></pre>

<pre><code>onBeforeUpdate</code></pre>

<pre><code>onMounted</code></pre>

The

beforeCreate

hook is not available in the Composition API. All hooks are prefixed with

on

, such as

onMounted

onBeforeMount

, and they are designed to be used within the

setup

function.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which function can be used to stop an effect created with <pre><code>watchEffect</code></pre>?

Available answers

<pre><code>stop</code></pre> function can be called on the effect's return value.

You cannot stop a <pre><code>watchEffect</code></pre>.

<pre><code>clearEffect</code></pre> function.

By returning <pre><code>false</code></pre> inside the effect function.

The

stop

function is used to stop a reactive effect obtained from

watchEffect

. The effect object returned by

watchEffect

contains the

stop

property, used to manually terminate the effect.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you create a dynamic component using the Composition API?

Available answers

By using <pre><code>defineComponent()</code></pre> function.

By using <pre><code>reactify()</code> to convert templates dynamically.</pre>

Using Vue's built-in <pre><code>component()</code></pre> directive.

By utilizing the <pre><code>is</code></pre> attribute with <pre><code><component></code></pre> tag and managing state dynamically in <pre><code>setup</code></pre>.

Dynamic components in Vue can be created using the

<component>

HTML element with an

is

attribute. The component specified through the

is

attribute can change based on the state managed in the

setup

function.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

Using the Composition API, how can you handle component-specific events, such as a click event?

Available answers

Directly within the <pre><code>setup</code></pre> function by binding the event.

Through the <pre><code>watchEffect</code></pre> function.

By defining methods returned from the <pre><code>setup</code></pre> function, which can then be used in templates.

Using <pre><code>onMounted</code></pre> to define handlers directly.

In the Composition API, you can define methods that handle events and return these methods from the

setup

function. These methods can then be assigned to event listeners in the template.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main purpose of the Vue Composition API?

Available answers

To simplify state management.

To organize complex logic and reuse code across components.

To enhance Vue's performance.

To create templates more efficiently.

The Composition API in Vue.js is primarily designed to organize complex logic and promote reusability of code across components. It allows for more flexible and better-organized code compared to the Options API.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which feature in the Composition API is designed to control and reuse async logic?

Available answers

<pre><code>defineAsyncComponent</code></pre>

<pre><code>asyncSetup</code></pre>

<pre><code>useAsyncEffect</code></pre>

Composable functions

Composable functions are designed within the Composition API to contain and reuse logic, including asynchronous logic, enabling you to efficiently manage and integrate async operations within your Vue components.