JavaScript Event Loop Explained by Lydia Hallie

Day 12 #100DaysOfCode 💻 Today I learned about Synchronous vs Asynchronous JavaScript, especially how setTimeout() and setInterval() work. JavaScript runs code synchronously by default (line by line). But functions like "setTimeout()" run asynchronously, meaning they execute later without blocking the main thread. Example: console.log("1"); setTimeout(() => { console.log("2"); }, 0); console.log("3"); Output: 1 3 2 Even with "0ms", "setTimeout" goes to the callback queue, so the synchronous code runs first. Understanding this concept helped me see how JavaScript handles non-blocking tasks. #JavaScript #AsyncJavaScript #WebDevelopment #CodingJourney #Akbiplob

Just built a fun and interactive Quote Generator using HTML, CSS, and JavaScript! With a single click, it brings up inspiring quotes — a simple idea but a great way to practice real-world JavaScript concepts like event handling and API integration. Always learning, always building 🚀 🚀 Here check my GitHub repo: 🔗 🚀 Day 13 of #100DaysOfCode #WebDev #JavaScript #FrontendDevelopment

We analyzed a page with 22MB uncompressed size. 17MB of that? JavaScript. 140 JS requests. 19.1s JS execution time. 4.6s TBT 🧐 Too much JavaScript hurts performance and your visitors feel it. Learn how you can fix it: https://lnkd.in/eER3Y65P #webperformance #gtmetrix

Day 37 JavaScript Journey Today was all about mastering Events, Event Bubbling, and Timers in JavaScript * What I learned today: - Event Handling Used addEventListener instead of old onclick Understood how event object (e) works Identified clicked elements using e.target - Event Bubbling & Propagation Learned how events travel from child → parent Used e.stopPropagation() to stop bubbling Controlled event flow like a pro - Prevent Default Behavior Used e.preventDefault() to stop link navigation (like Google link) - DOM Manipulation Removed elements dynamically using: remove() parentNode.removeChild() - setTimeout & clearTimeout Changed text after delay Stopped execution using button click - setInterval & clearInterval Started and stopped repeated execution Avoided multiple intervals using proper logic * Real Concept Learned - Event Delegation (handling multiple elements with one listener) * Big Takeaway: Understanding how events flow in the DOM makes your JavaScript much more powerful and optimized. - Small steps daily = Big progress over time github link : https://lnkd.in/gZu8669F #JavaScript #WebDevelopment #LearningInPublic #MERN #FrontendDeveloper #100DaysOfCode

🧠 Day 3 of 21 days challenge JavaScript Event Loop 🤯 Event Loop is a mechanism in JavaScript that handles execution of asynchronous code. It continuously checks the call stack and callback queue. If the stack is empty, it moves tasks from the queue to the stack for execution. For example :- console.log("Start"); console.log("End"); console.log("Timeout"); Wait… why this order? Because JavaScript doesn’t run everything instantly. It uses: • Call Stack • Web APIs • Callback Queue Event Loop decides what runs next. 💤For easy understanding :- Event Loop = decides execution order Sync code runs first Async code waits in queue Then runs after the stack is empty 👉 That’s why “Timeout” runs last This changed how I understand async code 🚀 #JavaScript #EventLoop #Async

There's Something i figured in JavaScript today that A.I code misinterprets. A.I sometimes can cobtaminate your code instead of building it. i would like to share that Tommorrow, want to know what i discovered?❓️❔️ lets connect Snow Works and stay tuned #javascript #snowworks #developer #linked

Can you explain the JavaScript event loop? Not because the concept is hard, but because explaining it clearly is what actually matters. Here’s the simplest way to break it down: JavaScript runs in a single thread, using a call stack to execute code. 1. Synchronous code runs first → Functions are pushed to the call stack and executed immediately 2. Async tasks are handled by the browser/environment → e.g. setTimeout, fetch, DOM events 3. Once the call stack is empty → the event loop starts working It processes queues in this order: 👉 Microtasks first (Promises, queueMicrotask) 👉 Then macrotasks (setTimeout, setInterval, I/O) Why? - A and D are synchronous → executed first - Promise (C) → microtask queue → runs next - setTimeout (B) → macrotask → runs last Explaining it step by step is simple — but doing it clearly makes all the difference. #Frontend #JavaScript #WebDevelopment #TechInterviews #SoftwareEngineering

🚀 JavaScript Fundamentals Series — Part 11 JavaScript runs a lot of things asynchronously. That’s where Promises come in. In this guide I explain: • What asynchronous JavaScript means • The problem with callback hell • How Promises solve it • .then() and .catch() • How async workflows work Understanding Promises is a big step toward mastering modern JavaScript. Full guide 👇 https://lnkd.in/dM6rp8YG #javascript #asyncjavascript #webdevelopment

🚀 JavaScript Fundamentals Series — Part 7 Most developers use arrays every day… But many don't fully understand array methods. This guide explains the most important ones: • map() • filter() • reduce() These methods help you write cleaner and more functional JavaScript. Once you master them, your code becomes much more expressive. Full guide 👇 https://lnkd.in/dZTRRCUx #javascript #webdevelopment #functionalprogramming

🚀 Day 947 of #1000DaysOfCode ✨ The Shortest JavaScript Program (You’ll Be Surprised 😮) This is one of those concepts that looks super simple… but completely changes how you see JavaScript. In today’s post, I’ve broken down the shortest possible JavaScript program — and trust me, it’s not just about writing less code. Behind this tiny piece of code lies how JavaScript actually runs your program, creates execution context, and prepares memory before even executing a single line. Sounds crazy? Wait till you see it. This is the kind of concept that once you understand, a lot of “weird JavaScript behavior” suddenly starts making sense. If you’re serious about mastering JavaScript, you don’t want to miss this one. 👉 Swipe through the carousel — this might blow your mind 🤯 👇 Did you already know what the shortest JS program is? #Day947 #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #Next #CodingCommunity #JSDeepDive