Coding 4 Dev @Coding4Devs

🧠 JavaScript Memory – Key Takeaways ✅ Stack: Primitives + calls ✅ Heap: Objects, closures ✅ GC frees unused memory ✅ Leaks = leftover listeners, DOM refs, intervals ✅ Fix with cleanups + devtools #JavaScript #MemoryManagement #FrontendTips #WebPerformance #coding4dev

JS Timers ✅ setTimeout(fn, 2000) – run once after delay ✅ setInterval(fn, 1000) – run every 1 sec ❌ Stop with clearTimeout() or clearInterval()🧠 Great for: toasts, animations, clocksKnow when to delay vs repeat! #JavaScript #Timers #WebDevTips #FrontendJS #coding4dev

✅ JavaScript Form Validation – Clean UX ✅ Check empty fields → input.value.trim() ✅ Email regex → /^[^\s@]+@[^\s@]+\.[^\s@]+$/ ✅ Show inline messages + styles ✅ Use e.preventDefault() to block submission #JavaScript #FormValidation #FrontendTips #WebDev #coding4dev

🧩 JavaScript Events – Key Concepts ✅ addEventListener() = attach interactivity ✅ e.target, e.type = event info ✅ Bubbling = child ➝ parent ✅ Capturing = parent ➝ child ✅ Use stopPropagation() to stop the flow #JavaScript #DOMEvents #FrontendTips #coding4dev

🌐 DOM Manipulation in JS – Know These Basics: ✅ getElementById, querySelector ✅ .textContent, .innerHTML, .style ✅ addEventListener('click', ...) ✅ Real DOM = native; Virtual DOM = framework-optimized #JavaScript #DOM #FrontendTips #WebDevelopment #coding4dev

🔁 JavaScript Event Loop – Async Made Simple✅ Call Stack = runs your code ✅ Task Queue = holds async callbacks ✅ Microtasks > Macrotasks ✅ JS is single-threaded — event loop coordinates the rest🧠 #JavaScript #EventLoop #AsyncJS #WebDevelopment #FrontendDev #coding4dev

⏳ Async/Await in JavaScript: ✅ async lets you use await ✅ await pauses until Promise resolves ✅ Use try...catch to handle errors ✅ Real-world friendly & cleaner than .then() Cleaner async = better code. #JavaScript #AsyncAwait #FrontendDev #WebDevelopment #coding4dev

🔮 Promises in JavaScript – Master Async Code ✅ Promise = future result of async task ✅ States: pending, fulfilled, rejected ✅ .then() handles success ✅ .catch() handles failure ✅ Cleaner than nested callbacks Learn this before async/await! #JavaScript #Promises #coding4dev

🔁 JavaScript Callbacks 101 ✅ Callbacks = functions passed as arguments ✅ Enable async behavior ✅ Watch out for callback hell 😵 ✅ Use Promises for cleaner logic Understand this = async made easy. #JavaScript #CallbackFunctions #AsyncJS #WebDevTips #coding4dev

🔢 Useful JavaScript Number Methods: ✅ parseInt("10px") → 10 ✅ toFixed(2) → format decimals ✅ isNaN("abc") → true ✅ Math.round(4.6) → 5 ✅ Math.random() → 0-1 Don't just crunch numbers — control them. #JavaScript #NumberMethods #FrontendDev #LearnJS #coding4dev

✂️ JavaScript String Methods You Should Know: ✅ slice(), substring(), substr() ✅ trim(), toUpperCase(), length ✅ includes() – search ✅ replace() – update Strings are everywhere. Learn to control them. #JavaScript #StringMethods #FrontendDev #WebDevTips #coding4dev

✅ JavaScript Truthy/Falsy: ❌ Only 7 falsy values: false, 0, "", null, undefined, NaN, document.all ✅ Everything else is truthy: [], {}, "false", "0" 🧠 Know this to avoid subtle bugs in conditions #JavaScript #TruthyFalsy #FrontendDev #WebDevTips #JSBasics #coding4dev

🚀 ES6 JavaScript Features to Master: ✅ let / const (block-scoped) ✅ Template literals – Hello, ${name} ✅ Spread ... and Rest ... ✅ Destructuring objects & arrays ✅ Arrow functions – cleaner syntax Write better JS today. #JavaScript #ES6 #WebDevTips #FrontendDev #coding4dev

🧱 JavaScript Objects 101: ✅ Create with {} ✅ Access with . or [] ✅ Destructure for clean variables ✅ Add methods using thisObjects = essential for real-world JS #JavaScript #Objects #FrontendDev #WebDevTips #LearnToCode #coding4dev

🔁 JavaScript Array Methods You NEED to Know:✅ map() – transform data ✅ filter() – select items ✅ reduce() – combine into oneUsed in: • Lists rendering • Data filtering • Cart totals & analyticsCode smart, not hard. #JavaScript #WebDevelopment #FunctionalJS #coding4dev

📦 JavaScript Arrays 101 ✅ Use [] to create ✅ arr[0] to access ✅ push() / pop() to mutate ✅ map() / filter() to transform ✅ Best for ordered collections Arrays = structure + power in JS #JavaScript #Arrays #WebDev #FrontendTips #JSBasics #coding4dev

🧠 JavaScript Closures 101:✅ A closure = a function + its outer scope ✅ It remembers variables after the outer fn returns ✅ Use it for private data, currying, factories ✅ Common interview question (🧨)Master closures = unlock advanced JS#JavaScript #Closures #coding4dev

JavaScript Hoisting — a quick guide:✅ var is hoisted as undefined ✅ let/const are hoisted, but live in TDZ ✅ Function declarations are hoisted ❌ Function expressions are notAvoid weird bugs — understand what happens before your code runs! #JavaScript #WebDev #coding4dev

🌍 Understanding JavaScript Scope: ✅ Global → Accessible everywhere ✅ Function → var scoped to the function ✅ Block → let, const scoped to {} ✅ Lexical → Inner functions access outer varsKnow your scopes = Fewer bugs#JavaScript #ScopeInJS #FrontendTips #coding4dev

🚀 Master React for frontend interviews! Build real-world UI components, solve machine coding questions & crack top tech roles. 📺 Watch now: youtube.com/playlist?list=… #ReactInterview #MachineCoding #ReactJS #FrontendDevelopment #Coding4Dev #JavaScript