lakshay gupta’s Post

🚀 Day 1 – Crack Interviews Series 🔹 Topic: What is Event Loop in JavaScript? JavaScript is single-threaded, but it can still handle async tasks using the Event Loop. 👉 It continuously checks: - Call Stack (what’s running) - Callback Queue (what’s waiting) When the stack is empty, it pushes queued tasks to execution. 💡 Real Example: console.log("Start"); setTimeout(() => { console.log("Async Task"); }, 0); console.log("End"); 👉 Output: Start End Async Task 🎯 Interview Question: Why does "setTimeout(fn, 0)" not run immediately? 👉 Answer: Because it goes to the callback queue and waits for the call stack to be empty. 💼 Pro Tip: Understanding Event Loop is key for handling async code, promises, and performance. 👇 Have you faced issues with async behavior in JavaScript? #javascript #webdevelopment #interviewprep #nodejs #frontend #backend #developers #coding

🚀 Day 4 – Crack Interviews Series 🔹 Topic: What is Hoisting in JavaScript? Hoisting is JavaScript’s behavior of moving declarations to the top of their scope before execution. 👉 Important: - "var" is hoisted and initialized with "undefined" - "let" & "const" are hoisted but stay in Temporal Dead Zone (TDZ) 💡 Real Example: console.log(a); // undefined var a = 10; console.log(b); // ReferenceError let b = 20; 🎯 Interview Question: Why does "let" throw error but "var" does not? 👉 Answer: Because "let" is in Temporal Dead Zone until initialized, while "var" is initialized with "undefined". 💼 Pro Tip: Avoid "var" in modern JavaScript — prefer "let" and "const" for safer scope handling. 👇 Have you ever faced a bug because of hoisting? #javascript #webdevelopment #frontend #nodejs #interviewprep #coding #developers

JavaScript Function Types Explained (Simple & Clear Guide) Functions are the backbone of JavaScript. If you understand functions well, you can write clean and powerful code 💡 Here are the most important types of functions in JavaScript 👇 💬 Which function type do you use most in your projects? #JavaScript #WebDevelopment #Frontend #Coding #ReactJS #NodeJS #Programming #Interviews #Tips #Tricks

JavaScript Function Types Explained (Simple & Clear Guide) Functions are the backbone of JavaScript. If you understand functions well, you can write clean and powerful code 💡 Here are the most important types of functions in JavaScript 👇 💬 Which function type do you use most in your projects? #JavaScript #WebDevelopment #Frontend #Coding #ReactJS #NodeJS #Programming #Interviews #Tips #Tricks

📌 GUESS THE OUTPUT ? Output is 511 if no strict mode use otherwise error come...................... Answer related to Strict Mode in JS. Test your JavaScript fundamentals with output-based interview questions focused on scope, hoisting, closures, and asynchronous behavior. 💬 Share your answer or reasoning in the comments. #JavaScript #InterviewPreparation #SoftwareEngineering #WebDevelopment #DevelopersOfLinkedIn #frontend #backend #coding #learning

Mastering JavaScript is essential for every developer, especially when it comes to understanding key concepts that can make or break your coding journey. Here are six output questions that every developer should master: 1. Event Loop: Understand how the event loop works and its role in asynchronous programming. 2. Promises: Learn how promises handle asynchronous operations and their states. 3. Closures: Grasp how closures work and their significance in JavaScript. 4. Async/Await: Familiarize yourself with async/await syntax for cleaner asynchronous code. 5. Scope: Explore variable scope and how it affects your code execution. 6. Hoisting: Know how hoisting impacts variable and function declarations. These concepts are crucial for coding interviews and will enhance your programming skills. #JavaScript #Frontend #Programming #SoftwareEngineering #CodingInterview #InterviewPreparation #JS #Developers #LearnToCode #ReactNative

🚀 Day 2 – Crack Interviews Series 🔹 Topic: What is Promise in JavaScript? A Promise is an object that represents the future result of an async operation. 👉 It has 3 states: - Pending ⏳ - Resolved ✅ - Rejected ❌ 💡 Real Example: const fetchData = new Promise((resolve, reject) => { let success = true; if (success) { resolve("Data received"); } else { reject("Error occurred"); } }); fetchData .then((res) => console.log(res)) .catch((err) => console.log(err)); 🎯 Interview Question: Why are Promises better than callbacks? 👉 Answer: - Avoid callback hell - Better error handling with ".catch()" - Cleaner and readable code 💼 Pro Tip: Promises are the base of async/await and modern async programming. 👇 Do you prefer Promises or async/await? #javascript #webdevelopment #nodejs #frontend #interviewprep #coding #developers

90% of candidates fail JavaScript interviews for one reason: weak fundamentals. Master these 10 basics… and you instantly stand out. 🔥💯 Most developers jump straight into frameworks like React… but interviewers test what’s underneath. Here are 10 JavaScript fundamentals you MUST master: Closures → How functions remember variables Hoisting → Why variables/functions behave unexpectedly Promises & Async/Await → Handling async like a pro Event Loop → How JS actually runs behind the scenes this Keyword → Context is everything Scope (var, let, const) → Avoid silent bugs Prototype & Inheritance → Core of JS OOP Array Methods (map, filter, reduce) → Write clean code DOM Manipulation → Basics still matter ES6+ Features → Destructuring, spread, arrow functions 🔖 Save this post & find the list below Follow me: - Parthib M. 🐺 to explore more updates on Web Development. credit : Rutu Koladiya #javascript #webdevelopment #frontend #coding #programming #100DaysOfCode #developers #softwareengineer

🚨 7 JavaScript Facts That Will Blow Your Mind 🤯 Think you know JavaScript? Wait till you see these 👇 1️⃣ NaN !== NaN 👉 Not even equal to itself 2️⃣ [] + [] = "" 👉 Empty arrays become an empty string 3️⃣ null + 1 = 1 👉 null is converted to 0 4️⃣ typeof null === "object" 👉 This is a bug in JavaScript 5️⃣ 0.1 + 0.2 !== 0.3 👉 Floating point precision issue 6️⃣ == vs === 👉 Always prefer === (strict equality) 7️⃣ JavaScript is single-threaded 👉 Handles async using the event loop 💡 One line to remember: 👉 “JavaScript is simple… until it’s not 😏” 💬 Which fact surprised you the most? 📌 Save this for interviews & quick revision #javascript #webdevelopment #frontend #coding #programming #javascriptdeveloper #learncoding #developers #100DaysOfCode

🚀 JavaScript Array Methods You Should Know If you’re still looping through arrays manually, there’s an easier way 👇 These array methods can make your code cleaner, faster to read, and easier to maintain: ✅ filter() → Get matching items ✅ map() → Transform data ✅ find() → Get the first match ✅ some() → Check if at least one item matches ✅ every() → Check if all items match ✅ includes() → Check if a value exists ✅ findIndex() → Find the position of an item ✅ push() / pop() → Add or remove items 💡 Pro tip: In React, map() and filter() are used a lot for rendering lists and handling data properly. Mastering these methods can help you write better code and do better in interviews 💻✨ Which array method do you use most often? 🤔 #JavaScript #WebDevelopment #ReactJS #FrontendDevelopment #Programming #Coding #Developer #SoftwareDevelopment #LearnToCode #CodingTips