Variable declaration using const in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constant named pi with the value 3.14.

Javascript

const [1] = 3.14;

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

Api

Bcircumference

Carea

Dradius

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that does not describe the value.

Trying to use 'let' or 'var' instead of 'const'.

The keyword const declares a constant variable. Here, pi is the name of the constant.

2fill in blank

medium

Complete the code to declare a constant MAX_USERS with the value 100.

Javascript

const [1] = 100;

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

AMaxUsers

BmaxUsers

Cmax_users

DMAX_USERS

Attempts:

3 left

💡 Hint

Common Mistakes

Using camelCase instead of uppercase with underscores.

Using lowercase letters for constant names.

Constants are often written in uppercase with underscores to separate words. Here, MAX_USERS is the correct style.

3fill in blank

hard

Fix the error in the code by completing the constant declaration for API_URL.

Javascript

const [1] = 'https://api.example.com';

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AApiUrl

BapiUrl

CAPI_URL

Dapi_url

Attempts:

3 left

💡 Hint

Common Mistakes

Using camelCase or lowercase for constant names.

Using variable names that do not follow constant naming conventions.

Constants that represent fixed values like URLs are usually written in uppercase with underscores. API_URL is the correct constant name.

4fill in blank

hard

Fill both blanks to declare constants for SECONDS_IN_MINUTE and MINUTES_IN_HOUR.

Javascript

const [1] = 60;
const [2] = 60;

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ASECONDS_IN_MINUTE

BsecondsInMinute

CMINUTES_IN_HOUR

DminutesInHour

Attempts:

3 left

💡 Hint

Common Mistakes

Using camelCase instead of uppercase with underscores.

Mixing up the names or values.

Constants are named in uppercase with underscores. Here, SECONDS_IN_MINUTE and MINUTES_IN_HOUR are the correct names.

5fill in blank

hard

Fill all three blanks to declare constants for PI, EULER, and GRAVITY with their respective values.

Javascript

const [1] = 3.14159;
const [2] = 2.71828;
const [3] = 9.8;

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

API

BEULER

CGRAVITY

Dgravity

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or camelCase names for constants.

Mixing up the order of constants.

Constants are named in uppercase letters. Here, PI, EULER, and GRAVITY are the correct constant names.