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Vue.js Mixins and Custom Directives Quiz

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Question 1/15

What is a key characteristic of Vue.js custom directives?

Select your answer

They are limited to dealing with Vue lifecycle hooks.

They automatically update data properties.

They are used to style Vue components.

They provide additional functionality for DOM manipulation.

Question 2/15

What happens to the methods in Vue components when they conflict with methods in mixins?

Select your answer

The application will throw a method conflict error.

Both methods are merged into a single function.

The mixin's methods invalidate the component's methods.

The component's methods take precedence.

Question 3/15

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

Filters

Mixins

Data properties

Question 4/15

What will happen if a mixin and a component contain conflicting data properties?

Select your answer

Both data properties will be merged.

The data property from the mixin will overwrite the component's data.

The data property from the component will take precedence.

An error will be thrown at runtime.

Question 5/15

Which option is correct regarding the 'bind' hook of a custom directive?

Select your answer

It's called when the element is inserted into the document.

It's called every time the directive's content changes.

It's called only once, when the directive is first bound to the element.

It's called when the directive is unbound from the element.

Question 6/15

What will be the precedence order if two mixins and a component share a property with the same name?

Select your answer

All properties are merged with no particular order.

Component property takes precedence, followed by mixins from bottom to top.

First mixin takes precedence, then the component, and lastly the second mixin.

Component property takes precedence, followed by mixins from top to bottom.

Question 7/15

Which method is used to define a global custom directive?

Select your answer

Vue.directive()

Vue.newDirective()

Vue.globalDirective()

Vue.customDirective()

Question 8/15

Which of the following is NOT true about Vue.js custom directives?

Select your answer

They are used to handle asynchronous data fetching.

They can manipulate the DOM directly.

They consist of hooks to apply changes to the DOM.

They extend syntax similar to Vue's built-in directives.

Question 9/15

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

Select your answer

Styling components consistently across the application.

Managing external state libraries gracefully.

Optimizing the rendering flow within components.

Adding reusable methods and options to multiple components.

Question 10/15

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

Select your answer

New directive instance is initiated on the element.

Element is bound to its parent.

The directive's update functions are triggered.

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

Question 11/15

Which method adds a method to all components in Vue?

Select your answer

Vue.plugin()

Vue.useGlobal()

Vue.extend()

Vue.mixin()

Question 12/15

What command is used to start the Vue development server?

Select your answer

npm dev

npm start vue

vue start

npm run serve

Question 13/15

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 update hook manipulates the element when DOM updates occur.

The unbind hook removes the directive upon element detachment.

Question 14/15

What are the main hooks of a custom directive?

Select your answer

beforeActive, active, inactive

bind, inserted, update, componentUpdated, unbind

init, mount, reload, remove

created, mounted, destroyed

Question 15/15

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

Select your answer

updated

created

mounted

beforeDestroy

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 key characteristic of Vue.js custom directives?

Available answers

They are limited to dealing with Vue lifecycle hooks.

They automatically update data properties.

They are used to style Vue components.

They provide additional functionality for DOM manipulation.

Custom directives in Vue.js are used to extend the HTML, providing additional functionalities that can directly manipulate the DOM, beyond what is available with built-in directives.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

What happens to the methods in Vue components when they conflict with methods in mixins?

Available answers

The application will throw a method conflict error.

Both methods are merged into a single function.

The mixin's methods invalidate the component's methods.

The component's methods take precedence.

When a method in a Vue component has the same name as a method in a mixin, the component's method takes precedence over the mixin's method.

Question 3/15

😊 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

Filters

Mixins

Data properties

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 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

What will happen if a mixin and a component contain conflicting data properties?

Available answers

Both data properties will be merged.

The data property from the mixin will overwrite the component's data.

The data property from the component will take precedence.

An error will be thrown at runtime.

In cases where a mixin and a component have conflicting data properties, Vue.js ensures that the component's data property takes precedence over the mixin's.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which option is correct regarding the 'bind' hook of a custom directive?

Available answers

It's called when the element is inserted into the document.

It's called every time the directive's content changes.

It's called only once, when the directive is first bound to the element.

It's called when the directive is unbound from the element.

The

bind

hook of a custom directive in Vue.js is called only once, when the directive is first bound to the element, setting up any initial state.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What will be the precedence order if two mixins and a component share a property with the same name?

Available answers

All properties are merged with no particular order.

Component property takes precedence, followed by mixins from bottom to top.

First mixin takes precedence, then the component, and lastly the second mixin.

Component property takes precedence, followed by mixins from top to bottom.

In Vue.js, when a component and multiple mixins define a property with the same name, the component's property takes precedence. If two mixins conflict, the properties from the latest mixin (bottom) take the lowest precedence.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which method is used to define a global custom directive?

Available answers

Vue.directive()

Vue.newDirective()

Vue.globalDirective()

Vue.customDirective()

Global custom directives in Vue.js are defined using the

Vue.directive()

method.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is NOT true about Vue.js custom directives?

Available answers

They are used to handle asynchronous data fetching.

They can manipulate the DOM directly.

They consist of hooks to apply changes to the DOM.

They extend syntax similar to Vue's built-in directives.

Vue.js custom directives are primarily concerned with manipulating the DOM and do not handle data fetching, which is typically managed in components or Vuex.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Styling components consistently across the application.

Managing external state libraries gracefully.

Optimizing the rendering flow within components.

Adding reusable methods and options to multiple components.

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

Question 10/15

😊 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.

Element is bound to its parent.

The directive's update functions are triggered.

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

The

unbind

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

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which method adds a method to all components in Vue?

Available answers

Vue.plugin()

Vue.useGlobal()

Vue.extend()

Vue.mixin()

The

Vue.mixin()

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

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

What command is used to start the Vue development server?

Available answers

npm dev

npm start vue

vue start

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 13/15

😊 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 update hook manipulates the element when DOM updates occur.

The unbind hook removes the directive upon element detachment.

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 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

What are the main hooks of a custom directive?

Available answers

beforeActive, active, inactive

bind, inserted, update, componentUpdated, unbind

init, mount, reload, remove

created, mounted, destroyed

Custom directives in Vue.js have a set of special hooks, namely:

bind, inserted, update, componentUpdated, unbind

, which allow you to apply behaviors to the DOM.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

updated

created

mounted

beforeDestroy

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.