String type behavior in Typescript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Typescript

let greeting: string = [1];

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

A`hello`

Bhello

C'hello'

D"hello"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to use quotes around the string value.

Using backticks when not needed.

In TypeScript, string values must be enclosed in quotes. Single quotes 'hello' or double quotes "hello" correctly define a string literal.

2fill in blank

medium

Complete the code to get the length of the string stored in variable 'name'.

Typescript

let length: number = name[1];

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

A.count

B.length

C.size

D.length()

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses like a function call (e.g., length()).

Using .size or .count which are not string properties.

In TypeScript, strings have a length property (without parentheses) to get their length.

3fill in blank

hard

Fix the error in the code to convert the string 'text' to uppercase.

Typescript

let upper = text[1];

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A.toUpperCase()

B.toUppercase()

C.uppercase()

D.upperCase()

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'c' in toUppercase().

Using methods that don't exist like uppercase() or upperCase().

The correct method to convert a string to uppercase in TypeScript is toUpperCase() with a capital C.

4fill in blank

hard

Fill both blanks to create a string that repeats 'ha' 3 times.

Typescript

let laugh = [1].repeat([2]);

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

A"ha"

B3

C2

D'ha'

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes inconsistently.

Repeating the string the wrong number of times.

The repeat method repeats a string a given number of times. Use the string "ha" and repeat it 3 times.

5fill in blank

hard

Fill all three blanks to create a new string with the first letter capitalized and the rest lowercase.

Typescript

let newStr = str[1](0, 1).[2]() + str[3](1).toLowerCase();

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

A.slice

B.toUpperCase

C.substring

D.substr

Attempts:

3 left

💡 Hint

Common Mistakes

Using slice instead of substring (both work but here substring is expected).

Forgetting parentheses after toUpperCase.

Using substr which is deprecated.

Use substring(0, 1) to get the first letter, then toUpperCase() to capitalize it. Use substring(1) to get the rest of the string.