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Vue.js Composition API Quiz

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Question 1/15

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 2/15

What is the main purpose of the Vue Composition API?

Select your answer

To enhance Vue's performance.

To organize complex logic and reuse code across components.

To create templates more efficiently.

To simplify state management.

Question 3/15

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.

By defining methods returned from the

setup

function, which can then be used in templates.

Through the

watchEffect

function.

Using

onMounted

to define handlers directly.

Question 4/15

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

Select your answer

By using

defineComponent()

function.

Using Vue's built-in

component()

directive.

By utilizing the

is

attribute with

<component>

tag and managing state dynamically in

setup

By using

reactify() to convert templates dynamically.

Question 5/15

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

Select your answer

Using

this

keyword directly.

Through a Vuex store object.

Using

setupContext

parameter.

Using

getCurrentInstance()

function.

Question 6/15

What should be the return type of a `setup` function?

Select your answer

A string representing component state.

A Vue component instance.

A render function.

An object containing properties and methods to expose to the template.

Question 7/15

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

Select your answer

refEffect

reactiveEffect

dependentMethod

watchEffect

Question 8/15

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

Select your answer

Composable functions

useAsyncEffect

defineAsyncComponent

asyncSetup

Question 9/15

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

Select your answer

onBeforeMount

onBeforeUpdate

beforeCreate

onMounted

Question 10/15

What role does the `setup` function play in the Composition API?

Select your answer

It acts as the render function for templates.

It initializes the props object.

It replaces the

mounted

lifecycle hook.

It provides accessibility to declare Composition API features and serves as a starting point for logic definition.

Question 11/15

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

Select your answer

reactive

ref

watch

computed

Question 12/15

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

Select your answer

Using

Vue.computed

method.

By assigning a function to a data object.

Using the

useComputed

function.

Using

computed

from

'vue'

library.

Question 13/15

How do you use props in the setup function?

Select your answer

Using

Vue.useProps

By accessing

props

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

By declaring them with

ref

By directly accessing

this.$props

Question 14/15

How can lifecycle hooks be used in a

setup

function?

Select your answer

Directly as named exports.

Using lifecycle hook functions like

onMounted

directly within the

setup

function.

By defining them in a separate file and importing them.

They cannot be used within

setup

function.

Question 15/15

Which function can be used to stop an effect created with

watchEffect

Select your answer

clearEffect

function.

You cannot stop a

watchEffect

By returning

false

inside the effect function.

stop

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

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 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 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main purpose of the Vue Composition API?

Available answers

To enhance Vue's performance.

To organize complex logic and reuse code across components.

To create templates more efficiently.

To simplify state management.

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 3/15

😊 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.

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

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

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 4/15

😊 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.

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>.

By using <pre><code>reactify()</code> to convert templates dynamically.</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 5/15

😊 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.

Through a Vuex store object.

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

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 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What should be the return type of a `setup` function?

Available answers

A string representing component state.

A Vue component instance.

A render function.

An object containing properties and methods to expose to the template.

The

setup

function returns an object that includes all the properties and methods to expose to the template, making them accessible within the component's HTML markup.

Question 7/15

😊 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>reactiveEffect</code></pre>

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

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

In the Composition API,

watchEffect

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

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Composable functions

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

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

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

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 9/15

😊 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>onBeforeUpdate</code></pre>

<pre><code>beforeCreate</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 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

What role does the `setup` function play in the Composition API?

Available answers

It acts as the render function for templates.

It initializes the props object.

It replaces the <pre><code>mounted</code></pre> lifecycle hook.

It provides accessibility to declare Composition API features and serves as a starting point for logic definition.

The

setup

function is used to set up the component by using the Composition API. It serves as the entry point for defining reactive data, lifecycle hooks, and other logic.

Question 11/15

😊 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>reactive</code></pre>

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

<pre><code>computed</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 12/15

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

By assigning a function to a data object.

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

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

Computed properties in the Composition API are created using the

computed

function from the

'vue'

library.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you use props in the setup function?

Available answers

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

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

Props are accessed in the

setup

function through the

props

argument that is passed to it.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Directly as named exports.

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

By defining them in a separate file and importing them.

They cannot be used within <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.

Question 15/15

😊 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.

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

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.

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.