Here are the 50 JavaScript interview questions for 2024

1. What is JavaScript?
2. What are the data types in JavaScript?
3. What is the difference between null and undefined?
4. Explain the concept of hoisting in JavaScript.
5. What is a closure in JavaScript?
6. What is the difference between “==” and “===” operators in JavaScript?
7. Explain the concept of prototypal inheritance in JavaScript.
8. What are the different ways to define a function in JavaScript?
9. How does event delegation work in JavaScript?
10. What is the purpose of the “this” keyword in JavaScript?
11. What are the different ways to create objects in JavaScript?
12. Explain the concept of callback functions in JavaScript.
13. What is event bubbling and event capturing in JavaScript?
14. What is the purpose of the “bind” method in JavaScript?
15. Explain the concept of AJAX in JavaScript.
16. What is the “typeof” operator used for?
17. How does JavaScript handle errors and exceptions?
18. Explain the concept of event-driven programming in JavaScript.
19. What is the purpose of the “async” and “await” keywords in JavaScript?
20. What is the difference between a deep copy and a shallow copy in JavaScript?
21. How does JavaScript handle memory management?
22. Explain the concept of event loop in JavaScript.
23. What is the purpose of the “map” method in JavaScript?
24. What is a promise in JavaScript?
25. How do you handle errors in promises?
26. Explain the concept of currying in JavaScript.
27. What is the purpose of the “reduce” method in JavaScript?
28. What is the difference between “null” and “undefined” in JavaScript?
29. What are the different types of loops in JavaScript?
30. What is the difference between “let,” “const,” and “var” in JavaScript?
31. Explain the concept of event propagation in JavaScript.
32. What are the different ways to manipulate the DOM in JavaScript?
33. What is the purpose of the “localStorage” and “sessionStorage” objects?
34. How do you handle asynchronous operations in JavaScript?
35. What is the purpose of the “forEach” method in JavaScript?
36. What are the differences between “let” and “var” in JavaScript?
37. Explain the concept of memoization in JavaScript.
38. What is the purpose of the “splice” method in JavaScript arrays?
39. What is a generator function in JavaScript?
40. How does JavaScript handle variable scoping?
41. What is the purpose of the “split” method in JavaScript?
42. What is the difference between a deep clone and a shallow clone of an object?
43. Explain the concept of the event delegation pattern.
44. What are the differences between JavaScript’s “null” and “undefined”?
45. What is the purpose of the “arguments” object in JavaScript?
46. What are the different ways to define methods in JavaScript objects?
47. Explain the concept of memoization and its benefits.
48. What is the difference between “slice” and “splice” in JavaScript arrays?
49. What is the purpose of the “apply” and “call” methods in JavaScript?
50. Explain the concept of the event loop in JavaScript and how it handles asynchronous operations.

ENJOY LEARNING 👍👍

New video out now please go and check out
https://www.instagram.com/reel/DBgckCqgZeo/?igsh=N3o4Z295NXk0Y3Fw

What Is MERN?

MERN Stack is a Javascript Stack that is used for easier and faster deployment of full-stack web applications. MERN Stack comprises of 4 technologies namely: MongoDB, Express, React and Node.js. It is designed to make the development process smoother and easier.

MongoDB

MongoDb is a NoSQL DBMS where data is stored in the form of documents having key-value pairs similar to JSON objects. MongoDB enables users to create databases, schemas and tables.

ExpressJS

ExpressJS is a NodeJS framework that simplifies writing the backend code. It saves you from creating multiple Node modules.



ReactJS

ReactJS is a JS library that allows the development of user interfaces for mobile apps and SPAs. It allows you to code Javascript and develop UI components.

NodeJS

NodeJS is an open-source Javascript runtime environment that allows users to run code on the server.

ENJOY LEARNING 👍👍

Complete JavaScript Road Map🔥

A-Z JavaScript👇

1.Variables
↳ var
↳  let
↳  const

2. Data Types
↳  number
↳  string
↳  boolean
↳  null
↳  undefined
↳  symbol

3.Declaring variables
↳  var
↳  let
↳  const

4.Expressions
Primary expressions
↳ this
↳  Literals
↳  []
↳  {}
↳  function
↳  class
↳ function*
↳  async function
↳  async function*
↳  /ab+c/i
↳ string
↳  ( )

Left-hand-side expressions
↳  Property accessors
↳ ?.
↳  new
↳  new .target
↳ import.meta
↳  super
↳  import()

5.operators
↳  Arithmetic Operators: +, -, *, /, %
↳  Comparison Operators: ==, ===, !=, !==, <, >, <=, >=
↳  Logical Operators: &&, ||, !

6.Control Structures
↳  if
↳  else if
↳  else
↳ switch
↳  case
↳  default

7.Iterations/Loop
↳  do...while
↳  for
↳  for...in
↳  for...of
↳ for await...of
↳  while

8.Functions
↳  Arrow Functions
↳  Default parameters
↳  Rest parameters
↳  arguments
↳  Method definitions
↳  getter
↳  setter

9.Objects and Arrays
↳  Object Literal: { key: value }
↳  Array Literal: [element1, element2, ...]
↳  Object Methods and Properties
↳  Array Methods: push(), pop(), shift(), unshift(),
   splice(), slice(), forEach(), map(), filter()

10.Classes and Prototypes
↳  Class Declaration
↳  Constructor Functions
↳  Prototypal Inheritance
↳ extends keyword
↳ super keyword
↳  Private class features
↳  Public class fields
↳  static
↳  Static initialization blocks

11.Error Handling
↳  try,
↳  catch,
↳ finally (exception handling)

ADVANCED CONCEPTS
--------------------------

12.Closures
↳  Lexical Scope
↳  Function Scope
↳  Closure Use Cases

13.Asynchronous JavaScript
↳  Callback Functions
↳  Promises
↳  async/await Syntax
↳ Fetch API
↳  XMLHttpRequest

14.Modules
↳  import and export Statements (ES6 Modules)
↳  CommonJS Modules (require, module.exports)

15.Event Handling
↳ Event Listeners
↳  Event Object
↳  Bubbling and Capturing

16.DOM Manipulation
↳ Selecting DOM Elements
↳  Modifying Element Properties
↳ Creating and Appending Elements

17.Regular Expressions
↳  Pattern Matching
↳ RegExp Methods: test(), exec(), match(), replace()

18.Browser APIs
↳ localStorage and sessionStorage
↳  navigator Object
↳  Geolocation API
↳  Canvas API

19.Web APIs
↳  setTimeout(), setInterval()
↳  XMLHttpRequest
↳ Fetch API
↳  WebSockets

20.Functional Programming
↳  Higher-Order Functions
↳ map(), reduce(), filter()
↳  Pure Functions and Immutability

21.Promises and Asynchronous Patterns
↳  Promise Chaining
↳  Error Handling with Promises
↳  Async/Await

22.ES6+ Features
↳  Template Literals
↳  Destructuring Assignment
↳  Rest and Spread Operators
↳  Arrow Functions
↳  Classes and Inheritance
↳  Default Parameters
↳  let, const Block Scoping

23.Browser Object Model (BOM)
↳  window Object
↳ history Object
↳  location Object
↳  navigator Object

24.Node.js Specific Concepts
↳  require()
↳  Node.js Modules (module.exports)
↳  File System Module (fs)
↳  npm (Node Package Manager)

25.Testing Frameworks
↳  Jasmine
↳  Mocha
↳  Jest

------------------- END-------------------

Some Good Resources To Learn JavaScript
1.Documentation

Mozilla MDN Web Docs
developer.mozilla.org/en-US/docs/Web…
DevDocs
devdocs.io/javascript/

2. Useful Channel's

https://youtube.com/playlist?list=PLGjplNEQ1it_oTvuLRNqXfz_v_0pq6unW&si=ghO3H2KGTcJgBrCf

Hope it helps 😊🌱

Happy Diwali 🪔

A very happy Diwali to you & your family 🪔✨

May this Diwali bring you lots of happiness & growth🪴

Learn JavaScript in 14 Days:

Part 1:

💻 Day 1 - Learn JavaScript Basics:
Start with understanding variables, data types, and basic syntax.

📊 Day 2 - Master Operators and Expressions:
Get comfortable using arithmetic, comparison, and logical operators.

⚖️ Day 3 - Dive into Conditional Statements:
Learn how to use if, else if, else, and switch for decision-making.

♻️ Day 4 - Explore Loops:
Understand how for, while, and do-while loops work.

🔧 Day 5 - Work with Functions:
Learn how to define and call functions, pass parameters, and return values.

📦 Day 6 - Introduction to Arrays:
Explore how to create arrays and manipulate them with methods like push(), pop(), and map().

📜 Day 7 - Object Basics:
Learn how to create and work with JavaScript objects, properties, and methods.

Like for Part-2 ❤️

ENJOY LEARNING 👍👍

Roadmap to devops

20 Backend Project Ideas🔥

🔹API for a Task Management System
🔹To-Do List API
🔹Blog Platform
🔹Markdown Note-taking App
🔹Online Code Compiler API
🔹E-commerce API
🔹URL Shortening Service
🔹Chat Application Backend
🔹Web Scraper CLI
🔹Online Bookstore
🔹Social Media API
🔹Music Streaming App
🔹Fitness Workout Tracker
🔹Authentication and Authorization Service
🔹File Upload and Management System
🔹Recipe Sharing Platform
🔹Event Booking System
🔹Expense Tracker API
🔹Weather Forecast Service
🔹Online Food Ordering System

---------------------------------------------------
Do not forget to React ❤️  to this Message for More Content Like this     
        
Thanks For Joining All ❤️🙏

Enjoy learning 🙏

Don't forget to react ❤️

🔥450+ Web dev projects 🔥

Hello Coders 👋 ,
Here is a list of 450+ projects using HTML, CSS, and JavaScript.👇

https://drive.google.com/drive/folders/16ozWeFQRZO-5PzJqh2uGCigyX03cFbcg?usp=sharing

---------------------------------------------------
Do not forget to React ❤️ to this Message for More Content Like this

Thanks For Joining All ❤️🙏