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Vue.js Mixins and Custom Directives Quiz

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Question 1/15

What is a common use case for mixins in Vue.js applications?

Select your answer

Optimizing the rendering flow within components.

Adding reusable methods and options to multiple components.

Styling components consistently across the application.

Managing external state libraries gracefully.

Question 2/15

What is a mixin in Vue.js used for?

Select your answer

To manage data binding in Vue components.

To extend Vue components with reusable functionalities.

To create custom event handlers in Vue.js applications.

To define Vue.js lifecycle hooks.

Question 3/15

Which function do you use to remove a global directive in Vue.js?

Select your answer

Vue.directive('directiveName', undefined)

Vue.removeDirective()

Vue.directive(null)

Vue.deleteDirective()

Question 4/15

Which of these methods correctly defines a directive that updates the element's text content?

Vue.directive('focus', {
  inserted: function (el) {
    el.focus()
  }
})

Select your answer

The bind hook is used correctly to set initial text content.

The inserted hook is correctly used to focus on an input element when inserted.

The unbind hook removes the directive upon element detachment.

The update hook manipulates the element when DOM updates occur.

Question 5/15

Which lifecycle hook is preferable to access DOM elements in a Vue component?

Select your answer

mounted

created

beforeDestroy

updated

Question 6/15

How are mixins included in the Vue instance treated in terms of lifecycle hooks?

Select your answer

The mixin's hooks overwrite the component's hooks.

Only after hooks from components are called.

Hooks from both the mixin and the component are called.

Only the component's hooks are called.

Question 7/15

Which Vue feature allows for parameterized custom directive usage, such as passing in different bind expressions?

Select your answer

HTML markup scripts.

Directive argument syntax using colons.

Preprocessor directives.

Template scoping methods.

Question 8/15

Which Vue.js component option begins with a method-based, imperative syntax by targeting the element once it has been inserted into the DOM?

Select your answer

Directives

Mixins

Data properties

Filters

Question 9/15

What command is used to start the Vue development server?

Select your answer

npm start vue

vue start

npm dev

npm run serve

Question 10/15

What lifecycle hook is typically used for data-fetching operations?

Select your answer

updated

beforeDestroy

created

mounted

Question 11/15

If a mixin and a component both have the same lifecycle hook, which one is called first?

Select your answer

The mixin's hook is called first, then the component's hook.

The component's hook is called first, then the mixin's hook.

Only the component's hook is called.

Only the mixin's hook is called.

Question 12/15

Which method adds a method to all components in Vue?

Select your answer

Vue.mixin()

Vue.plugin()

Vue.useGlobal()

Vue.extend()

Question 13/15

What benefit do Vue.js mixins provide?

Select your answer

They allow sharing of reusable functionalities across components.

They improve routing efficiency.

They enable automatic form validation.

They provide style encapsulation for components.

Question 14/15

What hook of a custom directive is used to update the directive when the bound VNode is updated?

Select your answer

bind

update

inserted

componentUpdated

Question 15/15

In Vue custom directives, what happens during the 'unbind' lifecycle hook?

Select your answer

New directive instance is initiated on the element.

Cleanup and other finalizations are performed when the directive is unbound from the element.

Element is bound to its parent.

The directive's update functions are triggered.

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is a common use case for mixins in Vue.js applications?

Available answers

Optimizing the rendering flow within components.

Adding reusable methods and options to multiple components.

Styling components consistently across the application.

Managing external state libraries gracefully.

Mixins are commonly used to include reusable and shared functionalities, such as methods or lifecycle options, across multiple components, promoting code reusability.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is a mixin in Vue.js used for?

Available answers

To manage data binding in Vue components.

To extend Vue components with reusable functionalities.

To create custom event handlers in Vue.js applications.

To define Vue.js lifecycle hooks.

Mixins in Vue.js allow you to define reusable functionalities that can be distributed across multiple components. This helps in keeping your code DRY (Don't Repeat Yourself).

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which function do you use to remove a global directive in Vue.js?

Available answers

Vue.directive('directiveName', undefined)

Vue.removeDirective()

Vue.directive(null)

Vue.deleteDirective()

To remove a global directive in Vue.js, you can pass

undefined

as the second argument to

Vue.directive()

, like so:

Vue.directive('directiveName', undefined)

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of these methods correctly defines a directive that updates the element's text content?

Vue.directive('focus', {
  inserted: function (el) {
    el.focus()
  }
})

Available answers

The bind hook is used correctly to set initial text content.

The inserted hook is correctly used to focus on an input element when inserted.

The unbind hook removes the directive upon element detachment.

The update hook manipulates the element when DOM updates occur.

In the provided code snippet,

inserted

is correctly being used to focus on an input element when it is inserted. This is typical for directives that manage focus or interaction with the DOM.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which lifecycle hook is preferable to access DOM elements in a Vue component?

Available answers

mounted

created

beforeDestroy

updated

The

mounted

lifecycle hook is called after the component is mounted onto the DOM, making it the ideal place to access DOM elements.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

How are mixins included in the Vue instance treated in terms of lifecycle hooks?

Available answers

The mixin's hooks overwrite the component's hooks.

Only after hooks from components are called.

Hooks from both the mixin and the component are called.

Only the component's hooks are called.

In Vue.js, lifecycle hooks in mixins are merged with the component's hooks, and both are called whenever the hook is run, with the component's hook being called after the mixin's.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which Vue feature allows for parameterized custom directive usage, such as passing in different bind expressions?

Available answers

HTML markup scripts.

Directive argument syntax using colons.

Preprocessor directives.

Template scoping methods.

In Vue.js, directive arguments are specified using colon syntax, allowing for parameterized use of custom directives for dynamic behavior changes.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which Vue.js component option begins with a method-based, imperative syntax by targeting the element once it has been inserted into the DOM?

Available answers

Directives

Mixins

Data properties

Filters

Directives provide a method-based syntax to directly target DOM elements for manipulating their behavior once they have been inserted, using setup hooks such as

inserted

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

What command is used to start the Vue development server?

Available answers

npm start vue

vue start

npm dev

npm run serve

The command

npm run serve

is used to start the development server for a Vue.js application when using the Vue CLI.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

What lifecycle hook is typically used for data-fetching operations?

Available answers

updated

beforeDestroy

created

mounted

The

created

lifecycle hook is often used for asynchronous operations such as data fetching, because it occurs before the template is mounted, allowing fetched data to be ready for the initial render.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

If a mixin and a component both have the same lifecycle hook, which one is called first?

Available answers

The mixin's hook is called first, then the component's hook.

The component's hook is called first, then the mixin's hook.

Only the component's hook is called.

Only the mixin's hook is called.

In Vue.js, when a mixin and component have the same lifecycle hook, the hook from the mixin is called first, followed by the one in the component.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which method adds a method to all components in Vue?

Available answers

Vue.mixin()

Vue.plugin()

Vue.useGlobal()

Vue.extend()

The

Vue.mixin()

method is used to add options such as methods to all components, making them globally available.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

What benefit do Vue.js mixins provide?

Available answers

They allow sharing of reusable functionalities across components.

They improve routing efficiency.

They enable automatic form validation.

They provide style encapsulation for components.

Vue.js mixins are primarily used for sharing and reusing functionalities like methods, data properties, and lifecycle hooks across multiple components.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

What hook of a custom directive is used to update the directive when the bound VNode is updated?

Available answers

bind

update

inserted

componentUpdated

The

update

hook is called whenever the VNode is updated, letting you react to changes and apply necessary updates to the directive.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

In Vue custom directives, what happens during the 'unbind' lifecycle hook?

Available answers

New directive instance is initiated on the element.

Cleanup and other finalizations are performed when the directive is unbound from the element.

Element is bound to its parent.

The directive's update functions are triggered.

The

unbind

hook is used for any cleanup tasks when the directive is unbound from an element, ceasing its interaction.