JavaScript String MCQ Questions and Answers

Practice these JavaScript String MCQ questions and answers to evaluate your understanding of string methods, string manipulation, concatenation, indexing, length property, and other commonly used JavaScript string operations. This quiz is useful for beginners, developers, and interview candidates preparing for JavaScript assessments and technical interviews.

What Are JavaScript Strings?

A JavaScript string is a sequence of characters used to represent and manipulate text data. Strings can contain letters, numbers, symbols, and special characters and are one of the most frequently used data types in JavaScript applications.

JavaScript provides various built-in string methods such as charAt(), indexOf(), slice(), substring(), replace(), split(), toUpperCase(), and toLowerCase() to perform common text processing operations.

Understanding string manipulation is important for form validation, user input processing, data formatting, web development projects, and JavaScript interviews. This MCQ quiz helps you strengthen your understanding of commonly used string concepts through practical questions.


Instructions

Topic- JS strings

The test consists of 14 questions.

No negative marking for this test.

No Time limit

The pass percentage is 70%

The correct answer with a description will be displayed after the answer has been marked.

Submit the test to calculate your score once you are done with all the questions.

Complexity Level- Moderate




Q1: Which of the following is the correct statement for string declaration in Javascript?

A. let a='hello';
B. let b="Hi";
C. let c = new String("Hi John");















Q2: Which of the following is the correct statement that finds the string length in JavaScript?

let a='hello';















Q3: Select whether the below JavaScript code is valid or not:

var x = "";












Q4: Select whether the below JavaScript code is valid or not:

let b ;
b="This is a string";











Q5: What will be the console output of the below Javascript code after applying the javascript slice function on a string?

let str1 = "kiwi, Mango, Orange";

let str2 = str1.slice(5, 11);

console.log(str2);
















Q6: Select the correct javascript code that finds the substring of the given string:

let str = "avocado, kiwi, cucumber";


















Q7: Select the correct javascript code to replace the word "Maimi" with "California":

let str = "He visited Miami last week!";




















Q8: What will be the console output of the below Javascript code?

let str = "HELLO WORLD";

let char = str.charAt(2);

console.log(char);


















Q9: Which of the following code snippets correctly changes the string into uppercase in JavaScript?

let technogeeks = 'techno-geeks for quiz and mcq';


















Q10: What will be the console output of the below Javascript code?

let text = "HELLO WORLD";
let char = text.charCodeAt(0);
console.log(char);


















Q11: Which string function is used to remove the whitespaces from both ends in the given javascript string?

let str1 = " techno-geeks! ";


















Q12: split() function in javascript is used to ______




















Q13: What will be the output of applying the startsWith() function on the below javascript string?

let str = "Hello geeks, welcome to the mcq world!";
str.startsWith("geeks");


















Q14: What will be the output of applying the includes() function on the below javascript string?

let str = "Hello geeks, welcome to the mcq world!";
str.includes("geeks");





























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Frequently Asked Questions (FAQs)

What is a JavaScript String?

A JavaScript string is a sequence of characters used to store and manipulate text. Strings can be created using single quotes, double quotes, or template literals.

Why are JavaScript strings important?

Strings are used extensively in web development for handling user input, displaying content, validating data, formatting text, and processing information.

What topics are covered in this JavaScript String quiz?

This quiz covers string declaration, concatenation, indexing, length property, and commonly used JavaScript string methods and operations.

Are JavaScript String MCQs useful for interviews?

Yes. JavaScript interviews frequently include questions related to string manipulation, string methods, template literals, and text processing concepts.

Who should take this JavaScript String quiz?

This quiz is suitable for beginners, students, front-end developers, and interview candidates who want to improve their JavaScript fundamentals.