Declaring global variables in Typescript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a global variable named count with initial value 0.

Typescript

let [1] = 0;

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

Avalue

Bcount

Cnumber

Dtotal

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong variable name like 'total' or 'value'.

Forgetting to declare the variable with 'let'.

The keyword let declares a variable named count globally with initial value 0.

2fill in blank

medium

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

Typescript

const [1] = 100;

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

AMAX_USERS

BmaxUsers

Cmax_users

DMaxUsers

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or camelCase instead of uppercase with underscores.

Using let instead of const.

The constant MAX_USERS is declared with const and assigned 100.

3fill in blank

hard

Fix the error in the code to declare a global variable username of type string.

Typescript

let [1]: string = "guest";

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

Auser_name

Bname

Cuser

Dusername

Attempts:

3 left

💡 Hint

Common Mistakes

Using underscores or different variable names.

Missing the type annotation : string.

The variable name must be exactly username to match the intended global variable.

4fill in blank

hard

Fill both blanks to declare a global variable isActive of type boolean with initial value true.

Typescript

let [1]: [2] = true;

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

AisActive

Bboolean

Cstring

Dactive

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names like 'active'.

Using wrong types like 'string' instead of 'boolean'.

The variable isActive is declared with type boolean and initial value true.

5fill in blank

hard

Fill all three blanks to declare a global constant API_URL of type string with value "https://api.example.com".

Typescript

const [1]: [2] = [3];

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

AAPI_URL

Bstring

C"https://api.example.com"

Durl

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names like 'url'.

Missing quotes around the URL string.

Using wrong types like 'boolean'.

The constant API_URL is declared as a string with the given URL value.