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Vue.js Mixins and Custom Directives Quiz

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Question 1/15

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

Select your answer

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

All properties are merged with no particular order.

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

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

Question 2/15

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

Select your answer

Vue.directive(null)

Vue.directive('directiveName', undefined)

Vue.removeDirective()

Vue.deleteDirective()

Question 3/15

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

Select your answer

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

Both methods are merged into a single function.

The application will throw a method conflict error.

The component's methods take precedence.

Question 4/15

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

Select your answer

The data property from the component will take precedence.

Both data properties will be merged.

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

An error will be thrown at runtime.

Question 5/15

Which method adds a method to all components in Vue?

Select your answer

Vue.plugin()

Vue.extend()

Vue.mixin()

Vue.useGlobal()

Question 6/15

Which method is used to define a global custom directive?

Select your answer

Vue.directive()

Vue.newDirective()

Vue.globalDirective()

Vue.customDirective()

Question 7/15

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

Select your answer

updated

beforeDestroy

created

mounted

Question 8/15

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 update hook manipulates the element when DOM updates occur.

The unbind hook removes the directive upon element detachment.

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

Question 9/15

What command is used to start the Vue development server?

Select your answer

npm run serve

npm dev

vue start

npm start vue

Question 10/15

How would you include a mixin in a Vue component?

Select your answer

Importing it directly into the methods object.

Using Vue.config.mixed

By adding it to the mixins array in the component definition.

By registering it as a directive.

Question 11/15

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

Select your answer

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

New directive instance is initiated on the element.

Element is bound to its parent.

The directive's update functions are triggered.

Question 12/15

What is a mixin in Vue.js used for?

Select your answer

To extend Vue components with reusable functionalities.

To manage data binding in Vue components.

To define Vue.js lifecycle hooks.

To create custom event handlers in Vue.js applications.

Question 13/15

What type of data can Vue.js custom directives manipulate?

Select your answer

DOM elements and their attributes.

Vuex state.

HTTP response objects.

Component internal state.

Question 14/15

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

Select your answer

created

mounted

beforeDestroy

updated

Question 15/15

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

Select your answer

Directive argument syntax using colons.

Template scoping methods.

HTML markup scripts.

Preprocessor directives.

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 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

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

All properties are merged with no particular order.

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

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

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 2/15

😊 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(null)

Vue.directive('directiveName', undefined)

Vue.removeDirective()

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 3/15

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

Both methods are merged into a single function.

The application will throw a method conflict error.

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 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

The data property from the component will take precedence.

Both data properties will be merged.

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

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 method adds a method to all components in Vue?

Available answers

Vue.plugin()

Vue.extend()

Vue.mixin()

Vue.useGlobal()

The

Vue.mixin()

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

Question 6/15

😊 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 7/15

😊 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 8/15

😊 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 update hook manipulates the element when DOM updates occur.

The unbind hook removes the directive upon element detachment.

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

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 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

What command is used to start the Vue development server?

Available answers

npm run serve

npm dev

vue start

npm start vue

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

How would you include a mixin in a Vue component?

Available answers

Importing it directly into the methods object.

Using Vue.config.mixed

By adding it to the mixins array in the component definition.

By registering it as a directive.

Mixins are included in a component by adding them to the

mixins

array in the component definition, like so:

mixins: [myMixin]

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

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

New directive instance is initiated on 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.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is a mixin in Vue.js used for?

Available answers

To extend Vue components with reusable functionalities.

To manage data binding in Vue components.

To define Vue.js lifecycle hooks.

To create custom event handlers in Vue.js applications.

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 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

What type of data can Vue.js custom directives manipulate?

Available answers

DOM elements and their attributes.

Vuex state.

HTTP response objects.

Component internal state.

Custom directives in Vue.js are designed to manipulate DOM elements and their attributes directly, providing dynamic functionality beyond the Vue built-in directives.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

created

mounted

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 15/15

😊 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

Directive argument syntax using colons.

Template scoping methods.

HTML markup scripts.

Preprocessor directives.

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