Anurag Sindhu’s Post

⚠️ A Common JavaScript Hoisting Myth Many developers say: “JavaScript moves variable and function declarations to the top of the code.” But that’s not actually true. Nothing is physically moved. What really happens is that before the code starts executing, the JavaScript engine runs a memory creation phase where it scans the code and allocates memory for variables and functions. • "var" - initialized with "undefined" • "let" and "const" - created but stay in the Temporal Dead Zone (TDZ) • Functions - their full definition is stored in memory So hoisting is not about moving code, it’s about how the JavaScript engine prepares memory before execution begins. The deeper I go into JavaScript internals, the more interesting it gets.🤓 #JavaScript #BackendDevelopment #NodeJS #SoftwareEngineering #SystemDesign #Programming #LearningInPublic

Most JavaScript developers use map, filter, and reduce daily. 🚀 But ask them the difference — and they freeze. → map transforms every item — same length array, different values → filter keeps only items that pass a condition — shorter array → reduce collapses the whole array into one value — number, object, anything → They can be chained together — filter first, then map, then reduce → map and filter never change the original array → reduce is the most powerful — and the most misused One rule: if you're manually pushing into a new array inside a loop — there's a cleaner way. Which one took you the longest to really understand? 👇 #javascript #webdevelopment #frontend #programming #javascripttips #learnjavascript #100daysofcode #softwareengineering #reactjs #coding

JavaScript has 3 ways to say "nothing". I used to think they were the same thing. I was wrong. Every time. 😅 → null — you set this. It means "empty on purpose". Like an empty box. → undefined — you forgot to give it a value. JavaScript noticed. → NaN — you tried to do math on a word. JS tried its best. It failed. 😂 → typeof null returns "object" — a 30 year old bug. Not your fault. → NaN === NaN is false. NaN doesn't even equal itself. Only in JS. 🤡 → Use Number.isNaN() to check for NaN. Not ===. Trust me on this one. Once you get this — a whole bunch of JS bugs suddenly make sense. Which one confused you the most when you started? Drop it below 👇 #javascript #webdevelopment #frontend #programming #javascripttips #learnjavascript #100daysofcode #softwareengineering #coding #reactjs

🚀 JavaScript Concepts Series – Day 6 / 30 📌 Closures in JavaScript 👀 Let’s Revise the Basics 🧐 A closure is when a function remembers variables from its outer scope even after the outer function has finished execution. 🔹 Key Points • Inner function can access outer variables • Data persists even after function execution • Useful for data privacy and state management 🔹 Example function outer() { let count = 0; return function inner() { count++; console.log(count); }; } const counter = outer(); counter(); // 1 counter(); // 2 💡 Key Insight Closure → Function + its lexical scope Remembers → Outer variables after execution Closures are widely used in callbacks, event handlers, and React hooks. More JavaScript concepts coming soon. 🚀 #javascript #js #webdevelopment #frontenddeveloper #coding #programming #developers #softwaredeveloper #learnjavascript #javascriptdeveloper #codinglife #devcommunity #webdev #reactjs #mernstack #codingjourney #codeeveryday #developerlife #100daysofcode #techlearning

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

Redux: Vanilla JavaScript https://lnkd.in/gspp_2MK A practical guide to implement Redux in Vanilla JavaScript, stripping away the complexity of frameworks to focus on core state management principles. Walking through the essential Redux workflow—Actions, Reducers, and the Store—demonstrating how to maintain a single source of truth in a web application. #ReactJS #reactjscourse #reactjsdeveloper #reactjsdevelopment #reactjstraining #codechallenge #programming #CODE #Coding #code #programmingtips #Redux #reduxredux

🚀 JavaScript Array Methods Every Developer Should Know Working with arrays becomes super powerful when you know these methods 👇 map() → transform every element filter() → remove unwanted elements find() → get the first matching element findIndex() → get index of matching element fill() → fill array with a value some() → check if at least one element matches every() → check if all elements match Mastering these will make your JavaScript code **cleaner and more functional.** 💬 Which method do you use the most? Follow for more **JavaScript tips, interview questions, and coding tricks.** #javascript #webdevelopment #coding #frontend #programming

💻 JavaScript Intermediate – Custom map() Function The map() method is widely used to transform arrays. Here’s how you can implement it manually. 📌 Problem: Apply a function to each element of an array and return a new array. function customMap(arr, callback) { let result = []; for (let i = 0; i < arr.length; i++) { result.push(callback(arr[i])); } return result; } let numbers = [1, 2, 3]; let doubled = customMap(numbers, function(num) { return num * 2; }); console.log(doubled); 📤 Output: [2, 4, 6] 📖 Explanation: • map() creates a new array by applying a function to each element. • Here, we manually implemented the same logic using a loop and callback. 💡 Tip: Understanding this helps you grasp how higher-order functions work in JavaScript. #JavaScript #Coding #WebDevelopment #FrontendDevelopment #LearnToCode #ProgrammingTips

React Core Concepts = part 1 1. Diff Algorithm React compares the previous Virtual DOM with the updated Virtual DOM when state or props change. detecting to the updation 2. Lazy Loading Lazy loading is used to improve the initial loading performance of the application.Instead of loading all components at startup, components are loaded only when they are required. Lazy loading uses dynamic imports, which allows the bundler to create separate chunks. 3 .Code Splitting Code splitting means splitting a large JavaScript bundle into smaller files (chunks). 4. Static Import Static import loads modules at build time and includes them in the main bundle. 5. Dynamic Import Dynamic import loads modules at runtime when the code executes. 6. Webpack Webpack is a module bundler that processes application source code and creates optimized build files. 7. Dynamic Bundling Dynamic bundling means loading JavaScript modules only when they are required instead of bundling everything into one large file. 8. Babel Babel is a JavaScript compiler.Browsers cannot understand JSX So Babel converts them into browser-compatible JavaScript. 9.Reconciliation Reconciliation is the process React uses to update the UI efficiently when state or props change. 10.Hooks Hooks allow functional components to use state, lifecycle features, and other React capabilities. 11.Memoization Memoization is a performance optimization technique used to avoid unnecessary recalculations. It works by storing the result of a computation in memory (cache). 12.Context API The Context API is used to share data across components without passing props manually at every level. 13.Suspense Suspense allows React to show a fallback UI while waiting for a component or data to load. #React #ReactJS #ReactDeveloper #ReactConcepts #LearnReact #ReactLearning #JavaScript #FrontendDevelopment #FrontendDeveloper #WebDevelopment #WebDev #Coding #Programming #CodeSplitting #LazyLoading #Webpack #Babel #ReactPerformance #Memoization #ReactHooks #ContextAPI #Suspense

Stop writing messy nested conditions in JavaScript ❌ Most developers still do this: 👉 multiple if checks 👉 deep nesting 👉 unreadable logic 🔥 Use this instead: ✔ Optional chaining ?. ✔ Logical AND && ✔ Clean single condition 💡 Result: Less code Better readability Fewer bugs 🔥 Clean code = Pro developer mindset #JavaScript #CodingTips #WebDevelopment #Frontend #Programming #CleanCode #Developers #JS