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Vue.js Component Basics Quiz

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Question 1/15

What attribute is used to ensure keys are unique in lists rendered with 'v-for'?

<li v-for="item in items" :key="item.id">{{ item.name }}</li>

Select your answer

:key

:class

:id

:ref

Question 2/15

How can you specify a default value for a prop in Vue.js?

props: {
  myProp: {
    type: String,
    default: 'Default Value'
  }
}

Select your answer

Using the 'methods' option.

Using the 'data' function.

Within the prop definition using 'default'.

Using computed properties.

Question 3/15

Which directive would you use to two-way bind a data property to an input element?

<!-- Vue template -->
<input v-model="username" />

Select your answer

v-on

v-bind

v-model

v-if

Question 4/15

What is the purpose of the 'data' function in a Vue component?

Select your answer

To specify the component's methods.

To import external scripts.

To store component's data that can be reactive.

To define the component's HTML template.

Question 5/15

What is the purpose of the 'mounted' lifecycle hook in Vue?

Select your answer

It is called after the component has been updated.

It is called after the component is added to the DOM.

It is called when the component's data changes.

It is called before the component is destroyed.

Question 6/15

What does the 'props' option in a Vue component do?

Select your answer

Specifies the global state of the application.

Lists events emitted by the component.

Lists the CSS styles for the component.

Specifies the data that can be passed into the component from its parent.

Question 7/15

What is a scoped slot in Vue?

<template #default="slotProps">
  <span>{{ slotProps.text }}</span>
</template>

Select your answer

A slot that styles differently depending on its parent.

A slot that has access to data passed from the child component.

A slot used for handling events.

A slot that cannot be overridden.

Question 8/15

What is the syntax for creating a computed property in Vue?

computed: {
  reversedMessage() {
    return this.message.split('').reverse().join('');
  }
}

Select your answer

Using the 'data' option.

Using the 'computed' option.

Using the 'watch' option.

Using the 'methods' option.

Question 9/15

Which Vue.js option is used to declare methods within a component?

Select your answer

computed

methods

watch

data

Question 10/15

What lifecycle hook would you use to fetch data when a component is created?

Select your answer

destroyed

mounted

created

updated

Question 11/15

How do you bind a JavaScript variable to an HTML element in a Vue template?

Select your answer

Using the double curly braces ({{ }}).

Using the 'v-bind' directive.

Using the 'v-model' directive.

Using the 'v-for' directive.

Question 12/15

Which directive would you use to conditionally render a piece of element?

Select your answer

v-if

v-on

v-for

v-show

Question 13/15

How would you register a component globally in Vue?

Vue.component('my-component', {
  template: '<div>A custom component!</div>'
});

Select your answer

Using 'Vue.directives'.

Using 'register'.

Using 'Vue.component'.

Using 'Vue.create'.

Question 14/15

What does the 'transition' element do in Vue.js?

<transition name="fade">
  <p v-if="show">Hello</p>
</transition>

Select your answer

It initializes Vue Router.

It manages CSS transitions/animations for components.

It provides state management.

It creates an asynchronous component.

Question 15/15

How do you emit an event from a child component in Vue?

// In child component
this.$emit('myEvent', payload);

Select your answer

Using 'this.$on'.

Using 'this.$emit'.

Using 'v-if'.

Using 'v-bind'.

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

What attribute is used to ensure keys are unique in lists rendered with 'v-for'?

<li v-for="item in items" :key="item.id">{{ item.name }}</li>

Available answers

:key

:class

:id

:ref

The ':key' attribute is used in Vue.js with 'v-for' directives to ensure that items have a unique identity. This helps Vue to optimize rendering by detecting changes.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you specify a default value for a prop in Vue.js?

props: {
  myProp: {
    type: String,
    default: 'Default Value'
  }
}

Available answers

Using the 'methods' option.

Using the 'data' function.

Within the prop definition using 'default'.

Using computed properties.

In Vue.js, you can specify a default value for a prop by including a 'default' field within the prop definition. The provided code snippet shows how to set 'Default Value' as the default for 'myProp'.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which directive would you use to two-way bind a data property to an input element?

<!-- Vue template -->
<input v-model="username" />

Available answers

v-on

v-bind

v-model

v-if

The 'v-model' directive in Vue creates a two-way data binding on form input, textarea, and select elements. The code snippet shows using 'v-model' to bind the 'username' property to an input element.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the 'data' function in a Vue component?

Available answers

To specify the component's methods.

To import external scripts.

To store component's data that can be reactive.

To define the component's HTML template.

The 'data' function in a Vue component returns an object. This object is reactive, meaning that Vue will automatically update the DOM when these properties change. It is used to store the component's state.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the 'mounted' lifecycle hook in Vue?

Available answers

It is called after the component has been updated.

It is called after the component is added to the DOM.

It is called when the component's data changes.

It is called before the component is destroyed.

The 'mounted' lifecycle hook is called after a Vue instance's component has been added to the DOM. It's commonly used for operations that require the component's elements to be present in the DOM.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does the 'props' option in a Vue component do?

Available answers

Specifies the global state of the application.

Lists events emitted by the component.

Lists the CSS styles for the component.

Specifies the data that can be passed into the component from its parent.

The 'props' option in a Vue component is used to declare properties that can be passed from the parent component. These props allow the component to be more flexible and dynamic.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is a scoped slot in Vue?

<template #default="slotProps">
  <span>{{ slotProps.text }}</span>
</template>

Available answers

A slot that styles differently depending on its parent.

A slot that has access to data passed from the child component.

A slot used for handling events.

A slot that cannot be overridden.

A scoped slot is a Vue slot that allows you to pass data from the child component back to the parent using the 'slot-scope' or newer shorthand syntax ('#'). The provided code snippet is an example where 'slotProps.text' is used.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the syntax for creating a computed property in Vue?

computed: {
  reversedMessage() {
    return this.message.split('').reverse().join('');
  }
}

Available answers

Using the 'data' option.

Using the 'computed' option.

Using the 'watch' option.

Using the 'methods' option.

Computed properties in Vue are defined within the 'computed' option of a component. They are cached based on their reactive dependencies and only re-evaluate when necessary. The provided code snippet shows an example of a computed property 'reversedMessage'.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which Vue.js option is used to declare methods within a component?

Available answers

computed

methods

watch

data

The 'methods' option in a Vue component is used to declare methods. Methods are functions that can be bound to events and invoked from templates and other component methods.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

What lifecycle hook would you use to fetch data when a component is created?

Available answers

destroyed

mounted

created

updated

The 'created' lifecycle hook is invoked when a Vue instance is created. It is a good place to fetch data because the component is fully initialized but not yet mounted.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you bind a JavaScript variable to an HTML element in a Vue template?

Available answers

Using the double curly braces ({{ }}).

Using the 'v-bind' directive.

Using the 'v-model' directive.

Using the 'v-for' directive.

In Vue templates, you use the double curly braces ({{ }}) to bind JavaScript expressions to HTML elements. This is known as interpolation.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which directive would you use to conditionally render a piece of element?

Available answers

v-if

v-on

v-for

v-show

The 'v-if' directive is used for conditionally rendering elements. When the condition is false, the element and its children are not rendered.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

How would you register a component globally in Vue?

Vue.component('my-component', {
  template: '<div>A custom component!</div>'
});

Available answers

Using 'Vue.directives'.

Using 'register'.

Using 'Vue.component'.

Using 'Vue.create'.

To register a component globally in Vue, use 'Vue.component()', passing the component's name and its options. This makes the component available throughout the entire application.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does the 'transition' element do in Vue.js?

<transition name="fade">
  <p v-if="show">Hello</p>
</transition>

Available answers

It initializes Vue Router.

It manages CSS transitions/animations for components.

It provides state management.

It creates an asynchronous component.

The 'transition' element in Vue.js is used to apply CSS transitions and animations to elements entering or leaving the DOM. The provided snippet wraps a transitioning paragraph with the 'fade' transition.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you emit an event from a child component in Vue?

// In child component
this.$emit('myEvent', payload);

Available answers

Using 'this.$on'.

Using 'this.$emit'.

Using 'v-if'.

Using 'v-bind'.

To emit an event from a child component in Vue, use 'this.$emit()' inside the child component. This allows the parent component to listen for the event. In the code snippet, 'myEvent' is the event emitted with a 'payload'.