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Vue.js Composition API Quiz

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Question 1/15

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

Select your answer

onBeforeUpdate

beforeCreate

onMounted

onBeforeMount

Question 2/15

In the Composition API, where does the

setup

function receive the context object from?

Select your answer

From the component's prototype.

As the second parameter of the setup function.

From an imported module.

From a global mixin.

Question 3/15

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

Select your answer

Through Vuex store updates.

Automatically tracked using features like

reactive

and

ref

Manually added by developers using

track

function.

By using decorators such as

@computed

Question 4/15

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 alias for a computed property.

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

An array used to store reactive data sequence.

Question 5/15

What function is commonly used in the Composition API to ensure that a side-effect re-runs when reactive dependencies change?

Select your answer

computed

ref

reactive

watch

Question 6/15

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

Select your answer

refEffect

dependentMethod

watchEffect

reactiveEffect

Question 7/15

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.

Using

Vue.useProps

By declaring them with

ref

Question 8/15

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

Select your answer

Composable functions

Component Methods

Provide/Inject

Props

Question 9/15

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

Select your answer

By using

reactify() to convert templates dynamically.

By utilizing the

is

attribute with

<component>

tag and managing state dynamically in

setup

By using

defineComponent()

function.

Using Vue's built-in

component()

directive.

Question 10/15

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 11/15

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

Select your answer

Using

this

keyword directly.

Using

setupContext

parameter.

Through a Vuex store object.

Using

getCurrentInstance()

function.

Question 12/15

Which function can be used to stop an effect created with

watchEffect

Select your answer

clearEffect

function.

By returning

false

inside the effect function.

stop

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

You cannot stop a

watchEffect

Question 13/15

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 create templates more efficiently.

To enhance Vue's performance.

Question 14/15

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

Select your answer

useAsyncEffect

asyncSetup

defineAsyncComponent

Composable functions

Question 15/15

How can lifecycle hooks be used in a

setup

function?

Select your answer

By defining them in a separate file and importing them.

They cannot be used within

setup

function.

Directly as named exports.

Using lifecycle hook functions like

onMounted

directly within the

setup

function.

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

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

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

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

<pre><code>onBeforeMount</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 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

In the Composition API, where does the <pre><code>setup</code></pre> function receive the context object from?

Available answers

From the component's prototype.

As the second parameter of the setup function.

From an imported module.

From a global mixin.

The context object is accessible as the second parameter in the

setup

function, providing access to slots, emit functions, and other options not exposed as part of the first props argument.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Through Vuex store updates.

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

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

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 4/15

😊 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 alias for a computed property.

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

An array used to store reactive data sequence.

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 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

What function is commonly used in the Composition API to ensure that a side-effect re-runs when reactive dependencies change?

Available answers

<pre><code>computed</code></pre>

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

<pre><code>watch</code></pre>

The

watch

function is used to perform a side-effect in response to changes in reactive dependencies. It's optimal for scenarios requiring tailored reactions to changes, differentiating it from

watchEffect

which automatically tracks dependencies.

Question 6/15

😊 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>refEffect</code></pre>

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

<pre><code>watchEffect</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 7/15

😊 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.

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

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

Props are accessed in the

setup

function through the

props

argument that is passed to it.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Composable functions

Component Methods

Provide/Inject

Props

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 9/15

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

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>.

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

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

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 10/15

😊 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 11/15

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

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

Through a Vuex store object.

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

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

getCurrentInstance()

helper function, which returns the component instance.

Question 12/15

😊 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>clearEffect</code></pre> function.

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

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

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

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 13/15

😊 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 create templates more efficiently.

To enhance Vue's performance.

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 14/15

😊 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>useAsyncEffect</code></pre>

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

<pre><code>defineAsyncComponent</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.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can lifecycle hooks be used in a <pre><code>setup</code></pre> function?

Available answers

By defining them in a separate file and importing them.

They cannot be used within <pre><code>setup</code></pre> function.

Directly as named exports.

Using lifecycle hook functions like <pre><code>onMounted</code></pre> directly within the <pre><code>setup</code></pre> function.

In the Composition API, lifecycle hooks such as

onMounted

onUpdated

, etc., can be directly used within the

setup

function by calling these hooks with the corresponding lifecycle actions.