Vue.js Composition API Quiz

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Question 1/15

What is the main purpose of the Vue Composition API?

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Question 2/15

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

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Question 3/15

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

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Question 4/15

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

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Question 5/15

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

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Question 6/15

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

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Question 7/15

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

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Question 8/15

In the Composition API, where does the
setup
function receive the context object from?

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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

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

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Question 11/15

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

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Question 12/15

How can lifecycle hooks be used in a
setup
function?

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Question 13/15

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 14/15

How do you use props in the setup function?

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Question 15/15

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

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Your Answers

Question 1/15
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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 2/15
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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 3/15
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How is dependency tracking achieved in Vue's Composition API?

Available answers

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
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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 5/15
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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 6/15
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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 7/15
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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 8/15
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In the Composition API, where does the <pre><code>setup</code></pre> function receive the context object from?

Available answers

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

Available answers

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 11/15
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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 12/15
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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 13/15
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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 14/15
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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 15/15
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How do you define a reactive state using the Composition API?

Available answers

In the Composition API, you can define a reactive state using the
ref
function for primitive types or
reactive
for objects.