What is Vue - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a Vue app instance.

Vue

const app = Vue.[1]({
  data() {
    return { message: 'Hello Vue!' };
  }
});

Drag options to blanks, or click blank then click option'

AcreateApp

BnewApp

CinitApp

DstartApp

Attempts:

3 left

💡 Hint

Common Mistakes

Using newApp or initApp which do not exist.

Vue uses createApp to start a new app instance.

2fill in blank

medium

Complete the code to mount the Vue app to an HTML element.

Vue

app.[1]('#app');

Drag options to blanks, or click blank then click option'

Astart

Battach

Cmount

Drender

Attempts:

3 left

💡 Hint

Common Mistakes

Using start or render which are not Vue app mounting methods.

The mount method attaches the Vue app to a DOM element.

3fill in blank

hard

Fix the error in the Vue component setup function.

Vue

export default {
  setup() {
    const count = Vue.[1](0);
    return { count };
  }
};

Drag options to blanks, or click blank then click option'

Areactive

Bref

Cstate

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using reactive which is for objects, not primitives.

Use ref to create a reactive primitive value in Vue's setup.

4fill in blank

hard

Fill both blanks to create a reactive object and access its property.

Vue

const state = Vue.[1]({ count: 0 });
console.log(state.[2]);

Drag options to blanks, or click blank then click option'

Areactive

Bcount

Cvalue

Dref

Attempts:

3 left

💡 Hint

Common Mistakes

Using ref for objects or value which is for refs.

reactive creates a reactive object, and count accesses its property.

5fill in blank

hard

Fill all three blanks to define a Vue component with a template and reactive state.

Vue

export default {
  [1]() {
    const message = Vue.[2]('Hello!');
    return { message };
  },
  template: `<div>[3]</div>`
};

Drag options to blanks, or click blank then click option'

Asetup

Bref

Cmessage

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using data instead of setup in Vue 3 composition API.

The setup function uses ref to create message reactive data, shown in the template.

Practice

1. What is Vue primarily used for?

easy

A. Managing databases and server data

B. Building interactive user interfaces with components

C. Writing backend server code

D. Designing static HTML pages without interaction

Solution

1. Step 1: Understand Vue's purpose

   Vue is a tool to create interactive parts of websites, called components.

2. Step 2: Compare options

   Only Building interactive user interfaces with components describes building interactive interfaces, which matches Vue's main use.

3. Final Answer:

   Building interactive user interfaces with components -> Option B

4. Quick Check:

   Vue = interactive UI builder [OK]

Hint: Vue is for interactive UI, not backend or static pages [OK]

Common Mistakes:

• Confusing Vue with backend frameworks
• Thinking Vue only creates static pages
• Assuming Vue manages databases

2. Which of the following is the correct way to start a Vue component file?

easy

A.

B. Hello Vue

C.

D. Hello Vue

Solution

1. Step 1: Identify Vue file structure

   Vue components use for HTML structure.

2. Step 2: Match options to Vue syntax

   Only
   Hello Vue
   uses correctly to start a Vue component.

3. Final Answer:

   <template><div>Hello Vue</div></template> -> Option D

4. Quick Check:

   Vue components start with <template> [OK]

Hint: Vue components start with <template> tag [OK]

Common Mistakes:

• Using <html> instead of <template>
• Putting HTML inside <script> tag
• Confusing <style> with HTML structure

3. What will this Vue template display if message is set to 'Hello World' in the component's data?

<template>
  <div>{{ message }}</div>
</template>

medium

A. Hello World

B. {{ message }}

C. message

D. Error: message not defined

Solution

1. Step 1: Understand Vue's data binding

   Vue replaces {{ message }} with the value of message from data.

2. Step 2: Apply given data value

   Since message = 'Hello World', the template shows 'Hello World'.

3. Final Answer:

   Hello World -> Option A

4. Quick Check:

   Data binding shows message value [OK]

Hint: {{ }} shows data values, not raw text [OK]

Common Mistakes:

• Thinking {{ message }} prints literally
• Expecting variable name instead of value
• Assuming error if data is defined

4. Identify the error in this Vue component code:

<template>
  <div>{{ title }}</div>
</template>

<script setup>
const title = 'Welcome to Vue'
</script>

medium

A. No error, code is correct

B. Using

C. Missing semicolon after const declaration

D. title variable not reactive

Solution

1. Step 1: Check Vue 3 syntax correctness

   Using

Hint: Vue 3

Common Mistakes:

• Expecting semicolon is mandatory in JS
• Thinking
• Assuming const variables are not reactive

5. You want to create a Vue component that shows a list of items and updates automatically when the list changes. Which Vue feature helps achieve this?

hard

A. Writing all HTML inside <script> tag

B. Using plain JavaScript arrays without Vue features

C. Reactive data binding with ref or reactive

D. Manually updating the DOM with document.querySelector

Solution

1. Step 1: Understand Vue's reactivity system

   Vue uses reactive data (ref/reactive) to track changes and update the UI automatically.

2. Step 2: Compare options for dynamic updates

   Only Reactive data binding with ref or reactive uses Vue's reactive data binding to update the list automatically.

3. Final Answer:

   Reactive data binding with ref or reactive -> Option C

4. Quick Check:

   Vue reactivity updates UI automatically [OK]

Hint: Use Vue's reactive data to auto-update UI [OK]

Common Mistakes:

• Trying to update DOM manually instead of reactive data
• Using plain arrays without Vue reactivity
• Putting HTML inside <script> tag