JavaScript Closure with IIFE in Loops

Var in for loops part 2 Did you Know actual flow of code ? for (var i = 0; i < 3; i++) {  setTimeout(function() {   console.log(i);  }, 1000); } Var in for loop actually prints 0, 1, 2 but because of async code waits in Macrotask with 3 times and when come with for execution it picks latest loop value thats why it prints same value 3 , 3 , 3 #React #ReactJS #ReactDeveloper #FrontendDevelopment #JavaScript #WebDevelopment #FrontendEngineer #UIEngineering #ComponentBased #Hooks #NextJS #SinglePageApplications #WebApps #SoftwareEngineering #CleanCode #DevCommunity #BuildInPublic #Coding #TechCareers #DeveloperLife #Javascript

🚨 JavaScript Tricky Question #1 What will be the output of this code? 🤔 console.log("Start"); setTimeout(() => { console.log("Timeout"); }, 0); Promise.resolve().then(() => { console.log("Promise"); }); console.log("End"); 💬 Comment your answer 👇 🔁 Follow for daily JS questions #javascript #webdevelopment #frontend #developers #programming #coding #nodejs #reactjs #softwareengineering

Why it is recommended that "let" is used in for loops instead of "var" while output is same in both cases ? .......................... Because 1. Scope difference (main reason) var → function scoped let → block scoped With var, the variable exists outside the loop block. 2. Major difference with async code This is where let becomes very important. Using var 3. Prevents accidental bugs With var ✅ Rule used in modern JavaScript Use let for variables that change Use const for variables that don't change Avoid var in modern code #webdevelopment #webdev #webdeveloper #frontend #frontenddeveloper #backend #backenddeveloper #fullstack #fullstackdeveloper #coding #programming #javascript #html #css #reactjs #nodejs #webdesign #softwaredeveloper #tech #devlife

Two lines. Same numbers. Completely different outputs 🤯 👉 "console.log(1 + 2 + "3");" 👉 "console.log("1" + 2 + 3);" Looks simple… but JavaScript has its own way of thinking 👀 Are you sure you know what the output will be? Watch till the end to understand how JavaScript actually evaluates expressions and why order matters more than you think! #JavaScript #WebDevelopment #Coding #Frontend #Developers #JSBasics

🚨 JavaScript Tricky Question #2 (Hard) What will be the output? 🤯 for (var i = 0; i < 3; i++) { setTimeout(() => { console.log(i); }, 1000); } 💬 Comment your answer 👇 🔁 Follow for daily JS questions #javascript #webdevelopment #frontend #developers #coding #nodejs #reactjs #interviewprep #programming

Two lines. Same numbers. Completely different outputs 🤯 👉 "console.log(1 + 2 + "3");" 👉 "console.log("1" + 2 + 3);" Looks simple… but JavaScript has its own way of thinking 👀 Are you sure you know what the output will be? I made a quick video breaking this down — and trust me, it’s NOT what most people expect 🚀 Watch till the end to understand how JavaScript actually evaluates expressions and why order matters more than you think! #JavaScript #WebDevelopment #Coding #Frontend #Developers #JSBasics

🚀 Mastering AbortController in JavaScript/ React (A Must-Know for Modern Developers) ✅ Why should you care? ✔ Prevents memory leaks ✔ Avoids unnecessary API calls ✔ Improves performance It allows you to cancel ongoing async operations like fetch requests. 🔥 React Use Case: useEffect(() => { const controller = new AbortController(); fetch(''https://lnkd.in/d5dTeXqf'', { signal: controller.signal }) .then(res => res.json()) .then(setData) .catch(err => { if (err.name !== 'AbortError') console.error(err); }); return () => controller.abort(); // cleanup }, []); Always clean up API calls in useEffect — especially in React Strict Mode, where effects run twice in development. Follow for more 🚀 Chinmay Kulkarni #javascript #webdevelopment #frontend #reactjs #reactdeveloper #coding #programming #developers #softwareengineering #tech #interviewprep #100daysofcode #learninpublic #reactperformance #asyncjavascript

🚀 Default Export vs Named Export in React — Stop Confusing Them! 🔹 Default Export ✔ Only one per file ✔ No curly braces needed ✔ You can rename it while importing export default Header; import MyHeader from "./Header"; --- 🔹 Named Export ✔ Multiple exports allowed ✔ Must use curly braces ✔ Name must match while importing export const add = () => {}; import { add } from "./utils"; --- 🔥 Key Difference 👉 Default = One main thing 👉 Named = Multiple utilities --- Nishant Pal 💬 Which one do you use more — Default or Named? #ReactJS #JavaScript #WebDevelopment #Frontend #Coding #Developers #LearnToCode

🚀 Node.js vs Express.js — What’s the Differences? 👉 Key Difference: Node.js is the engine 🛠️ Express.js is the toolkit 🧰 that makes development easier #NodeJS #ExpressJS #BackendDevelopment #JavaScript #WebDevelopment #Coding #Developers

Breaking down core concepts in a simple way helps in understanding React better and faster. • Managing data inside components • Handling side effects like API calls & timers • Understanding lifecycle behavior in modern React #ReactJS #WebDevelopment #Frontend #JavaScript #Coding #Tech