String concatenation in output in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the greeting message.

Javascript

console.log('Hello, ' + [1] + '!');

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

A123

B'name'

Cname

Dgreeting

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the variable name, which prints the word instead of its value.

We use the variable name without quotes to concatenate its value.

2fill in blank

medium

Complete the code to join first and last names with a space.

Javascript

let fullName = firstName + [1] + lastName;

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

A' '

B""

C'-'

D'_'

Attempts:

3 left

💡 Hint

Common Mistakes

Using no space or wrong separator characters like underscore or dash.

A space character inside quotes is used to separate the names.

3fill in blank

hard

Fix the error in concatenating number and string.

Javascript

let message = 'You have ' + [1] + ' new messages.';

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

AmessageCount

B'5'

C5

Dfive

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string literal '5' instead of the variable holding the count.

Use the variable messageCount which holds the number value to concatenate properly.

4fill in blank

hard

Fill both blanks to create a sentence with age and city.

Javascript

let info = 'I am ' + [1] + ' years old and live in ' + [2] + '.';

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

Aage

B'age'

Ccity

D'city'

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around variable names, which prints the names instead of values.

Use variables age and city without quotes to insert their values.

5fill in blank

hard

Fill all three blanks to build a full greeting sentence.

Javascript

let greeting = 'Hello, ' + [1] + '! You are ' + [2] + ' years old and from ' + [3] + '.';

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

AuserName

BuserAge

CuserCity

D'userName'

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around variable names, causing incorrect output.

Use variables userName, userAge, and userCity without quotes to get their values.