Primitive data types in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable with a string value.

Javascript

let greeting = [1];

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

A123

BHello

C"Hello"

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to use quotes for string values.

Using a number or boolean without quotes.

The value assigned to a string variable must be enclosed in quotes.

2fill in blank

medium

Complete the code to declare a variable with a boolean value.

Javascript

const isActive = [1];

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

Atrue

B"true"

C1

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around true or false.

Using capitalized False instead of lowercase false.

Boolean values are true or false without quotes.

3fill in blank

hard

Fix the error in the code to correctly assign a number.

Javascript

let age = [1];

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

A"25"

Btwentyfive

Ctrue

D25

Attempts:

3 left

💡 Hint

Common Mistakes

Putting numbers inside quotes making them strings.

Using words instead of digits for numbers.

Numbers are written without quotes in JavaScript.

4fill in blank

hard

Fill both blanks to create an object with a string and a number property.

Javascript

const person = { name: [1], age: [2] };

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

A"Alice"

B30

Ctrue

DAlice

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted strings for name.

Putting numbers in quotes for age.

The name property needs a string with quotes, and age needs a number without quotes.

5fill in blank

hard

Fill all three blanks to create a variable with undefined, null, and symbol values.

Javascript

let a = [1];
let b = [2];
let c = [3]('id');

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

Aundefined

Bnull

CSymbol

Dsymbol

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around undefined or null.

Using lowercase symbol instead of Symbol.

undefined and null are primitive values, and Symbol is a function to create unique symbols.