JavaScript String and literals Quiz

Topics : JavaScript Strings and literals

JavaScript Quiz #03 - JavaScript String

The String object in JavaScript is used to represent and manipulate sequences of characters.

5 mins read

1. What is the output?

 let str = "Hello";
 console.log(str.split(""));

["H", "e", "l", "l", "o"]

["Hello"]

"Hello"

2. What is the output of the following code snippet?

 let x = “John”;
 let y = new String(“John”);
 console.log(x === y);

true

false

3. What is the output of the following code snippet?

 let str = “5” + 2;
 console.log(str);

"7"

"52"

4. What is the output of the following code snippet?

 let str = “Hello” — 2;
 console.log(str);

NaN

Hello2

Hello-2

5. Which method is used to remove whitespace from both ends of a string?

string.trim()

string.strip()

string.removeWhitespace()

string.trimWhitespace()

6. What is the output of the following code snippet?

 let str = “Hello, World!”;
 console.log(str.slice(0, 5))

Hello

Hello,

Hell

World

7. What is the output of the following code snippet?

 const str = null;
 str.toString();

null

undefined

TypeError

8. What is the output of the following code snippet?

 let str = “Hello, World!”;
 console.log(str.substr(-3))

Hello

Hel

ld!

9. Which code snippet checks if a string is empty in JavaScript?

str.isEmpty()

str.checkEmpty()

str.length === 0

str.checkLength()

10. What is the difference between using single quotes (') and double quotes (") to create a string literal in JavaScript?

There is no difference, both can be used interchangeably.

Single quotes should be used for short strings and double quotes for longer strings.

Single quotes are preferred for string literals, while double quotes are used for template literals.

11. Which of the following is an example of a multiline string literal?

"Hello\nWorld"

'Hello\nWorld'

`Hello\nWorld`