JavaScript String In Javascript Interview Questions & Answers

Q1. What is a String in JavaScript?

A string is a data type used to store text or characters. Strings are written inside quotes.

JavaScript allows three types of quotes:

Example

let name = "John";
let city = 'London';
let message = `Hello World`;

Q2. What is String Concatenation?

String concatenation means joining two or more strings together.

Example

let firstName = "John";
let lastName = "Doe";

let fullName = firstName + " " + lastName;
console.log(fullName);

Output

John Doe

Q3. What is Template Literal in JavaScript?

Template literals allow embedding variables and expressions inside strings using backticks.

Example

let name = "John";
let message = `Welcome ${name}`;
console.log(message);

Output

Welcome John

Template literals make string formatting easier.

Q4. How Can You Find the Length of a String?

JavaScript provides the length property to find the number of characters in a string.

Example

let text = "JavaScript";
console.log(text.length);

Output

Q5. How Can You Convert String Case in JavaScript?

JavaScript provides methods to change letter case.

toUpperCase( )

let text = "hello";
console.log(text.toUpperCase());

toLowerCase( )

let text = "HELLO";
console.log(text.toLowerCase());

Quipoin Menu