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Vue.js Directives and Filters Quiz

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Question 1/15

What is the main difference between v-if and v-show directives?

Select your answer

v-if is less efficient than v-show in terms of performance.

v-if is used for forms, while v-show is used for lists.

v-if completely removes an element from the DOM, while v-show toggles its display mode.

v-if binds data to elements, while v-show binds text.

Question 2/15

Given an object data binding, which directive allows you to watch the key count dynamically?

Select your answer

v-watch:keys

v-if:keys

v-bind:keys

v-for

Question 3/15

Which Vue.js directive would you use to add a click event on a button?

Select your answer

v-handle:click

v-click

v-on:click

v-event:click

Question 4/15

How does the Vue.js v-for directive work?

Select your answer

It defines a transition or animation between elements.

It caches data to optimize performance.

It binds DOM events to methods using inline declarations.

It iterates over a collection and renders a template for each item.

Question 5/15

What syntax allows you to access and modify the value of a component property within the parent context using v-model?

Select your answer

v-input='prop'

v-parent='prop'

v-model='$parent'

v-bind='$parent'

Question 6/15

How can you pass multiple event handlers to a single element in Vue.js?

<div v-on="{ mouseup: onMouseUp, touchend: onTouchEnd }"></div>

Select your answer

Bind events directly in the data object.

Use an array of methods with v-on.

Declare a watch property for the event.

Chain multiple v-on directives.

Question 7/15

Which directive would you use to conditionally apply a CSS class to an element in Vue.js?

Select your answer

v-apply:class

v-if:class

v-bind:class

v-show:class

Question 8/15

What is the correct method to parse a list of numbers and double each number using Vue filters?

Vue.filter('double', function(value) {
  return value.map(num => num * 2);
})

Select your answer

Using lifecycle hooks to adjust data in place.

Using v-bind and a custom method.

Using a filter declared in computed properties.

Via the v-model directive directly.

Question 9/15

What is the purpose of using the v-pre directive in a Vue.js template?

Select your answer

To enable prefetching data requirements.

To skip compilation for this element and all its children.

To trigger immediate component re-rendering.

To prevent elements from loading initially.

Question 10/15

Which of these is NOT a valid directive in Vue.js?

Select your answer

v-copy

v-model

v-for

v-show

Question 11/15

When using v-for to iterate over an object, what does the second argument in the loop represent?

Select your answer

The previous value of the iteration.

The length of the object.

The value of each property.

The key of each property.

Question 12/15

How can you dynamically apply inline styles to a Vue component?

Select your answer

v-style

v-change:style

v-on:style

v-bind:style

Question 13/15

How does the Vue.js v-once directive affect component reactivity?

Select your answer

It slows down the reactivity system to save resources.

It refreshes the component every second using a timer.

It removes the component from the reactivity tracker after the initial render.

It updates all properties to static but keeps methods reactive.

Question 14/15

Which directive allows you to bind an element attribute to a Vue.js variable or expression?

Select your answer

v-text

v-for

v-bind

v-on

Question 15/15

When applying a Vue filter, which syntax is correct for usage in a template context?

Select your answer

capitalize(message)

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main difference between v-if and v-show directives?

Available answers

v-if is less efficient than v-show in terms of performance.

v-if is used for forms, while v-show is used for lists.

v-if completely removes an element from the DOM, while v-show toggles its display mode.

v-if binds data to elements, while v-show binds text.

v-if

removes the element from the DOM if the condition is false, whereas

v-show

only toggles the element's CSS display property.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

Given an object data binding, which directive allows you to watch the key count dynamically?

Available answers

v-watch:keys

v-if:keys

v-bind:keys

v-for

v-for

allows iteration over the object keys, making it useful to respond to changes in key count.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which Vue.js directive would you use to add a click event on a button?

Available answers

v-handle:click

v-click

v-on:click

v-event:click

The

v-on

directive is used to listen for DOM events like clicks. It binds the click event to a Vue method.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

How does the Vue.js v-for directive work?

Available answers

It defines a transition or animation between elements.

It caches data to optimize performance.

It binds DOM events to methods using inline declarations.

It iterates over a collection and renders a template for each item.

v-for

is used to render a list of items by iterating over an array or object and allows access to each item and its index during iteration.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

What syntax allows you to access and modify the value of a component property within the parent context using v-model?

Available answers

v-input='prop'

v-parent='prop'

v-model='$parent'

v-bind='$parent'

Using

v-model="$parent.propertyName"

, you can directly bind and update a variable defined at the parent level from the child component.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you pass multiple event handlers to a single element in Vue.js?

<div v-on="{ mouseup: onMouseUp, touchend: onTouchEnd }"></div>

Available answers

Bind events directly in the data object.

Use an array of methods with v-on.

Declare a watch property for the event.

Chain multiple v-on directives.

With

v-on

, you can bind multiple handlers by using an object syntax, for example, binding both mouse and touch end events.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which directive would you use to conditionally apply a CSS class to an element in Vue.js?

Available answers

v-apply:class

v-if:class

v-bind:class

v-show:class

v-bind:class

allows for binding a CSS class conditionally based on the return value of a JavaScript expression.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the correct method to parse a list of numbers and double each number using Vue filters?

Vue.filter('double', function(value) {
  return value.map(num => num * 2);
})

Available answers

Using lifecycle hooks to adjust data in place.

Using v-bind and a custom method.

Using a filter declared in computed properties.

Via the v-model directive directly.

You can register a filter using

Vue.filter

and apply it in templates with the

operator to transform data such as doubling numbers in a list.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of using the v-pre directive in a Vue.js template?

Available answers

To enable prefetching data requirements.

To skip compilation for this element and all its children.

To trigger immediate component re-rendering.

To prevent elements from loading initially.

v-pre

skips compilation for the element and its children, which can be useful to handle raw items like code snippets.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of these is NOT a valid directive in Vue.js?

Available answers

v-copy

v-model

v-for

v-show

v-copy

is not a valid directive in Vue.js. The valid directives are

v-if

v-for

v-model

v-show

, etc.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

When using v-for to iterate over an object, what does the second argument in the loop represent?

Available answers

The previous value of the iteration.

The length of the object.

The value of each property.

The key of each property.

When using

v-for

to iterate over objects, the second argument specifies the key of each property in the object.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you dynamically apply inline styles to a Vue component?

Available answers

v-style

v-change:style

v-on:style

v-bind:style

v-bind:style

is used to apply inline styles dynamically with binding to data properties or expressions.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

How does the Vue.js v-once directive affect component reactivity?

Available answers

It slows down the reactivity system to save resources.

It refreshes the component every second using a timer.

It removes the component from the reactivity tracker after the initial render.

It updates all properties to static but keeps methods reactive.

v-once

makes an element unreactive after the initial render, preserving the performance of static content.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which directive allows you to bind an element attribute to a Vue.js variable or expression?

Available answers

v-text

v-for

v-bind

v-on

v-bind

is used to bind HTML attribute values to data properties or computed properties in Vue.js.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

When applying a Vue filter, which syntax is correct for usage in a template context?

Available answers

<capitalize>{{ message }}</capitalize>

<filter>capitalize(message)</filter>

Use

{{ message | capitalize }}

to apply Vue filters directly within a template to format data.