Text interpolation with mustache syntax in Vue - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display the message using mustache syntax.

Vue

<template>
  <p>[1]</p>
</template>

<script setup>
const message = 'Hello, Vue!'
</script>

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

Amsg

Bmessage

Ctext

Dcontent

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that is not defined in the script.

Forgetting to use double curly braces for interpolation.

The mustache syntax {{ message }} displays the value of the message variable in the template.

2fill in blank

medium

Complete the code to interpolate the user's name inside the greeting.

Vue

<template>
  <h1>Welcome, [1]!</h1>
</template>

<script setup>
const userName = 'Alice'
</script>

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

Ausername

Buser

Cname

DuserName

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that does not match the script variable.

Missing the curly braces around the variable.

The variable userName holds the user's name, so {{ userName }} shows it in the template.

3fill in blank

hard

Fix the error in the template to correctly show the count variable.

Vue

<template>
  <span>[1]</span>
</template>

<script setup>
const count = 5
</script>

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

Acount

Bcounts

CCount

Dcounter

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase letters that don't match the variable name.

Using a different variable name not declared in the script.

Variable names are case-sensitive. The correct variable is count with lowercase 'c'.

4fill in blank

hard

Fill both blanks to interpolate the first and last name in the greeting.

Vue

<template>
  <p>Hello, [1] [2]!</p>
</template>

<script setup>
const firstName = 'John'
const lastName = 'Doe'
</script>

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

AfirstName

BlastName

CfullName

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single variable that does not exist.

Mixing up the order of first and last name.

Use firstName and lastName to show both names in the greeting.

5fill in blank

hard

Fill all three blanks to interpolate the user's full info: uppercase first name, age, and city.

Vue

<template>
  <p>[1] is [2] years old and lives in [3].</p>
</template>

<script setup>
const firstName = 'emma'
const age = 28
const city = 'Paris'
</script>

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

AfirstName.toUpperCase()

Bage

Ccity

DfirstName

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to use firstName without converting to uppercase.

Using wrong variable names for age or city.

Use firstName.toUpperCase() to show the name in uppercase, then age and city as declared.

Practice

1. What does the mustache syntax {{ message }} do in a Vue template?

easy

A. It displays the value of the variable message inside the HTML.

B. It creates a new variable called message.

C. It comments out the text inside the braces.

D. It runs a JavaScript function named message.

Solution

1. Step 1: Understand mustache syntax purpose

   The mustache syntax {{ }} is used in Vue to insert data values into HTML templates.

2. Step 2: Identify what {{ message }} does

   It shows the current value of the variable named message in the rendered HTML.

3. Final Answer:

   It displays the value of the variable message inside the HTML. -> Option A

4. Quick Check:

   Mustache syntax = display variable value [OK]

Hint: Mustache {{ }} always shows variable content in HTML [OK]

Common Mistakes:

• Thinking it creates variables
• Assuming it runs functions
• Confusing it with comments

2. Which of the following is the correct way to display a variable title inside a Vue template using mustache syntax?

easy

A. [[ title ]]

B. { title }

C. {{ title }}

D. {% title %}

Solution

1. Step 1: Recall Vue interpolation syntax

   Vue uses double curly braces {{ }} to insert variables into templates.

2. Step 2: Match the correct syntax

   Only {{ title }} matches Vue's mustache syntax for interpolation.

3. Final Answer:

   {{ title }} -> Option C

4. Quick Check:

   Vue interpolation = {{ variable }} [OK]

Hint: Vue uses double curly braces {{ }} for interpolation [OK]

Common Mistakes:

• Using single braces instead of double
• Confusing with other template syntaxes
• Using wrong bracket types

3. Given the Vue data: { name: 'Anna' }, what will be rendered by this template?

<div>Hello, {{ name }}!</div>

medium

A. Hello, {{ name }}!

B. Hello, Anna!

C. Hello, name!

D. Hello, !

Solution

1. Step 1: Identify the data value

   The variable name has the value 'Anna'.

2. Step 2: Understand interpolation output

   The mustache syntax replaces {{ name }} with 'Anna' in the rendered HTML.

3. Final Answer:

   <div>Hello, Anna!</div> -> Option B

4. Quick Check:

   Variable value replaces {{ name }} [OK]

Hint: Mustache {{ }} shows variable value, not the code itself [OK]

Common Mistakes:

• Expecting to see {{ name }} literally
• Confusing variable name with its value
• Leaving interpolation empty

4. What is wrong with this Vue template snippet?

<div>{{ user.name </div>

medium

A. Mustache syntax cannot access object properties.

B. Variable user is not defined.

C. Interpolation must use square brackets instead of curly braces.

D. Missing closing curly braces for interpolation.

Solution

1. Step 1: Check mustache syntax completeness

   The snippet has only one closing curly brace; mustache syntax requires double closing braces }}.

2. Step 2: Confirm correct syntax for interpolation

   Proper interpolation should be {{ user.name }} with both opening and closing double braces.

3. Final Answer:

   Missing closing curly braces for interpolation. -> Option D

4. Quick Check:

   Mustache needs {{ and }} to work [OK]

Hint: Always close mustache with double braces }} [OK]

Common Mistakes:

• Using single closing brace
• Forgetting to close interpolation
• Thinking square brackets are needed

5. You want to display a greeting that changes based on time using mustache syntax. Which template code correctly shows 'Good morning' if hour is less than 12, otherwise 'Good afternoon'?

hard

A. <div>{{ hour < 12 ? 'Good morning' : 'Good afternoon' }}</div>

B. <div>{{ if (hour < 12) 'Good morning' else 'Good afternoon' }}</div>

C. <div>{{ hour < 12 && Good morning || 'Good afternoon' }}</div>

D. <div>{{ hour < 12 ? Good morning : Good afternoon }}</div>

Solution

1. Step 1: Understand mustache supports JavaScript expressions

   Mustache syntax in Vue allows simple JavaScript expressions like ternary operators.

2. Step 2: Check each option for correct syntax

   <div>{{ hour < 12 ? 'Good morning' : 'Good afternoon' }}</div> uses a valid ternary expression with quotes around strings, which is correct. <div>{{ if (hour < 12) 'Good morning' else 'Good afternoon' }}</div> uses invalid syntax inside mustache. <div>{{ hour < 12 && Good morning || 'Good afternoon' }}</div> misses quotes around Good morning, causing a syntax error. <div>{{ hour < 12 ? Good morning : Good afternoon }}</div> misses quotes around strings, causing errors.

3. Final Answer:

   <div>{{ hour < 12 ? 'Good morning' : 'Good afternoon' }}</div> -> Option A

4. Quick Check:

   Ternary with quotes works in mustache [OK]

Hint: Use ternary with quotes inside {{ }} for conditional text [OK]

Common Mistakes:

• Omitting quotes around strings
• Using if-else statements inside mustache
• Using logical operators incorrectly