Debouncing vs Throttling: Improve Frontend Performance with JavaScript

🔁 Closures in JavaScript A closure is when a function remembers variables from its parent function, even after the parent function has finished executing. function outer() {  let count = 0;  return function inner() {   count++;   console.log(count);  } } const counter = outer(); counter(); // 1 counter(); // 2 👉 inner() still remembers count 👉 That memory is called a closure If closures ever confused you, save this post 👍 #JavaScript #WebDevelopment #Frontend #CodingSimplified #LearnJS #BhaviDigital

Can you guess the output? 🤔 (JavaScript — no cheating) Take a second and think… 👇 👇 Output: A D C B Why does this happen? Because of the Event Loop. JavaScript first runs all synchronous code. Once the call stack is empty, the Event Loop: - executes all microtasks (Promises) - then moves to the macrotask queue (timers) That’s why Promise callbacks run before setTimeout, even with 0ms. Once the Event Loop clicks, async JavaScript finally starts making sense. Did you guess it right? 😄 #javascript #js #eventloop #async #frontend

Understanding Array.reduce() in JavaScript 👨💻 A simple example of how reduce() helps calculate the total order amount from an array of objects clean, readable, and powerful. Once it clicks, you’ll start seeing reduce() everywhere. #JavaScript #WebDevelopment #Frontend #CodingTips #ReactJS #LearnToCode

⏳ Debounce in JavaScript – Write Smarter, Faster Apps Ever noticed search boxes that wait until you stop typing before firing an API call? That’s debouncing in action. Debounce ensures a function runs only after a certain delay once the last event occurs. 🧠 When should you use Debounce? Search input API calls Window resize events Button click protection Form validations It helps reduce unnecessary function executions and improves performance. 🚀 Why Debounce Matters Improves performance Prevents API spamming Enhances user experience 💡 Tip If events fire continuously, use debounce. If events must fire at regular intervals, use throttle. #JavaScript #Debounce #Frontend #WebDevelopment #Coding #InterviewPrep

Closures in JavaScript — Explained Simply A lot of people use closures without actually understanding them. So let’s kill the confusion. What’s a Closure? A closure is just a function that remembers the variables from where it was created, even after that outer function has finished running. Think of it like this The inner function carries a backpack Inside that backpack → variables from the outer scope. #JavaScript #Closures #WebDevelopment #Frontend #ReactJS #LearningInPublic #JavaScriptBasics

Ever wondered why useEffect runs twice and thought: “React is broken”? It’s actually doing you a favor. In development, React deliberately re-runs effects to expose: - Hidden side-effects - Missing cleanups - Unsafe logic This behavior occurs in Strict Mode and does not affect production. Once you understand this, you can stop fighting React and start writing effects that are predictable, clean, and future-proof. React isn’t trolling you; it’s training you. #React #ReactHooks #Frontend #JavaScript #WebDevelopment

Ever wondered why your JavaScript logs run out of order? This is one of the most common async mistakes. The fix isn’t complex — it’s async/await. Once you see it, you can’t unsee it. Cleaner flow. Predictable output. Better code. Try this pattern in your code today. #JavaScript #AsyncAwait #WebDevelopment #Frontend #SoftwareEngineering #makstyle119

🚀 JavaScript Promises — From Pending to Powerful Promises solve a simple problem: 👉 “I’ll give you the result later.” They make async code readable, predictable, and chainable. 🧠 Promise States (In Real Life) Pending → task started Fulfilled → task completed successfully Rejected → task failed A promise moves only once from pending. 📌 What’s Happening Here? ✔️ Promise starts in pending state ✔️ resolve moves it to fulfilled ✔️ .then() passes data to the next step ✔️ .catch() handles errors in the chain 💡 Golden Rule: “Every .then() returns a new promise — that’s why chaining works.” #JavaScript #Promises #AsyncJavaScript #Frontend #WebDevelopment #JSConcepts #InterviewPrep #ReactJS

🚀 JavaScript Hoisting: What Really Happens Behind the Scenes? Hoisting is one of those JavaScript concepts that looks confusing… until you understand how the JavaScript engine reads your code. 🧠 Hoisting = memory allocation before execution, not moving code upward. 📌 What’s Really Happening? ✔️ var is hoisted and initialized with undefined ✔️ let and const are hoisted but stay in the Temporal Dead Zone (TDZ) ✔️ Accessing let / const before initialization throws ReferenceError ✔️ Function scope creates a new execution context with its own hoisting phase 💡 Rule to Remember: “If JavaScript knows the variable exists but hasn’t initialized it yet → TDZ.” #JavaScript #Hoisting #Frontend #WebDevelopment #JSInternals #InterviewPrep #ReactJS #MERN

🧠⚡ Microtasks vs Macrotasks: Mastering the JavaScript Event Loop JavaScript isn’t just single-threaded — it’s precisely orchestrated. Behind every Promise, async/await, and setTimeout lies the event loop that decides what runs first and why. 🔹 Why Promises feel “immediate” 🔹 Why setTimeout(fn, 0) still waits 🔹 How microtasks guarantee atomic async flows 🔹 Why macrotasks keep browsers responsive Once you understand the two-queue model, async bugs stop being “mysteries” and start being predictable behavior. If you write JavaScript, this mental model is non-negotiable. 🚀 👉 Read the full deep dive here - https://lnkd.in/gBweAVaX #JavaScript #EventLoop #Microtasks #Macrotasks #AsyncAwait #Promises #WebPerformance #Frontend #NodeJS #SoftwareEngineering