Vue.js Composition API Quiz

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Question 1/15

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

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Question 2/15

What is the main purpose of the Vue Composition API?

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Question 3/15

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

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Question 4/15

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

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Question 5/15

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

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Question 6/15

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

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Question 7/15

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

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Question 8/15

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

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Question 9/15

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

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Question 10/15

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

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Question 11/15

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

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Question 12/15

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

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Question 13/15

How do you use props in the setup function?

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Question 14/15

How can lifecycle hooks be used in a
setup
function?

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Question 15/15

Which function can be used to stop an effect created with
watchEffect
?

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Your Answers

Question 1/15
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What best describes a `ref` in the Vue Composition API?

Available answers

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
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What is the main purpose of the Vue Composition API?

Available answers

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

Available answers

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

Available answers

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

Available answers

Inside a setup function, the current instance can be accessed using the
getCurrentInstance()
helper function, which returns the component instance.
Question 6/15
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What should be the return type of a `setup` function?

Available answers

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

Available answers

In the Composition API,
watchEffect
allows developers to run a function whenever its dependencies change, automating side effects tracking.
Question 8/15
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Which feature in the Composition API is designed to control and reuse async logic?

Available answers

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

Available answers

The
beforeCreate
hook is not available in the Composition API. All hooks are prefixed with
on
, such as
onMounted
or
onBeforeMount
, and they are designed to be used within the
setup
function.
Question 10/15
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What role does the `setup` function play in the Composition API?

Available answers

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

Available answers

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

Available answers

Computed properties in the Composition API are created using the
computed
function from the
'vue'
library.
Question 13/15
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How do you use props in the setup function?

Available answers

Props are accessed in the
setup
function through the
props
argument that is passed to it.
Question 14/15
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How can lifecycle hooks be used in a <pre><code>setup</code></pre> function?

Available answers

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

Available answers

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.