🚀 Frontend System Design #3: JavaScript Event Loop JavaScript is single-threaded… But still handles async code smoothly 🤯 Most developers use: setTimeout Promises APIs But don’t fully understand what’s happening behind the scenes 👀 This is where the Event Loop comes in ⚡ 💡 Once you understand this: • Debugging becomes easier • Async code makes sense • Performance issues become clearer 👉 Slide 8 is something every developer should know 🧠 Quick Quiz: Which runs first? setTimeout(() => console.log("A"), 0) Promise.resolve().then(() => console.log("B")) Comment your answer 👇 📌 Save this if you found it useful Follow for more frontend system design 🚀 #JavaScript #Frontend #WebDevelopment #SystemDesign #ReactJS #Coding

Behind the Screen – #31 Do you know? JavaScript is #SingleThreaded, but it can still handle multiple tasks at once. How? JavaScript uses something called the #EventLoop. Here’s the idea: 👉 JavaScript runs one task at a time (single thread)   👉 Long tasks (like API calls, timers) are handled outside the main thread   👉 When they are ready, they are added to a queue   👉 The Event Loop picks tasks from the queue one by one  So instead of doing everything at once, #JavaScript manages tasks efficiently. That’s why: • Your UI doesn’t freeze during API calls   • Timers work in the background   • Apps feel responsive  🔥 JavaScript doesn’t do multiple things at the same time — it manages them smartly. #javascript #webdevelopment #frontend #softwareengineering #techfacts

⚡ Debounce vs Throttle — Optimizing Event Handling in JavaScript Handling frequent events like typing can quickly lead to unnecessary function executions and performance issues if not controlled properly. 🧠 Key Differences: • Normal execution → Runs on every event trigger • Debounce → Executes only after the user stops triggering the event • Throttle → Limits execution to once per specified time interval 💡 Why it matters: Uncontrolled event handling can lead to excessive API calls and degraded performance. Applying the right strategy ensures efficient, predictable, and optimized behavior. ⚡ Takeaway: Use debounce for input fields and search functionality Use throttle for continuous events like scrolling or resizing Choosing the right approach is essential for building high-performance, scalable frontend applications. #JavaScript #FrontendDevelopment #WebDevelopment #ReactJS #Performance #CleanCode #SoftwareEngineering #Debounce #Throttle

https://lnkd.in/dtDQ4jRn — I built this because a broken token shouldn't ruin your Monday. As a Frontend Engineer, I’ve spent way too many hours staring at encoded strings in TypeScript and wondering why my auth was failing. While building the Jwt Decoder for my platform using Next.js 15, I hit a wall with specific character encodings that most online tools just ignored. 🚀 I leveraged Cursor to help me hunt down edge cases in the Base64URL implementation that often trip up standard decoders. The logic was fine-tuned using Bun for ultra-fast testing, ensuring that even the messiest payloads don't crash the UI. 🛠️ To keep the experience slick, I went with Tailwind CSS, Radix UI, and shadcn/ui components. It’s amazing how much a clean layout helps when you're debugging at 2 AM. 💻 Building this taught me a huge lesson: the "modern baseline" for dev tools isn't just functionality; it's the error handling. ✨ I remember one night debugging a "missing" claim for hours, only to realize I had a trailing space in my copy-paste. Now, this tool trims that automatically. ⚡ I’ve deployed the whole suite on Vercel to keep it snappy for everyone. 🔍 What’s the most frustrating bug you’ve ever found hidden inside a JWT? 🐛 🤝 #JwtDecoder #FrontendEngineer #TypeScript #ReactJS #Nextjs15 #TailwindCSS #WebDevelopment #JavaScript #SoftwareEngineering #DevTools #CodingLife #Vercel #Bun #Programming #FullStack

Why does the page refresh when a form is submitted? And how do developers stop it? The answer is preventDefault(). In JavaScript, some events have default browser behavior. Examples: • Form submission → refreshes page • Anchor tag → navigates to another page But sometimes we want to control this behavior with JavaScript. That’s where preventDefault() comes in. Example: form.addEventListener("submit", function(e) { e.preventDefault(); }); Now the browser won't refresh the page, and we can handle the form using JavaScript. 💡 Important: preventDefault() → stops default browser behavior stopPropagation() → stops event bubbling Two different things. Many developers mix them up. Small concepts like this build strong frontend fundamentals. Follow for more JavaScript & Frontend engineering concepts. #javascript #frontenddeveloper #webdevelopment #coding #learninpublic

https://lnkd.in/dtbE_xHs – Ever wondered how to turn your birthday into a masterpiece of ancient logic? 🎂 As a Frontend Engineer who lives in TypeScript and Next.js 15, I’m obsessed with turning complex logic into simple, accessible UI. 💻 I recently added the Roman Numeral Date Converter to my platform, and the math behind it was surprisingly tricky to implement. Converting modern dates isn't just about swapping numbers; it’s about handling specific subtractive rules while keeping the user experience snappy. I built the core logic using Bun for lightning-fast local execution and styled the components with Tailwind CSS and Radix UI for full accessibility. 🛠️ To handle the state and validation across different date formats, I relied on TanStack Query to keep everything synchronized and bug-free. A few years ago, a friend asked me to "double-check" a Roman numeral for a tattoo he was getting. 🖋️ I realized there wasn't a reliable tool that handled different separators and formats correctly, so I vowed to build one myself. ✅ Using Vite for unit testing ensured that edge cases—like leap years or dates from the distant past—work perfectly every single time. 🚀 It’s one of 300+ tools I’ve built to make life (and tattoos) a little less stressful for everyone. 🏛️ Building tools like this reminds me that even "ancient" problems need modern, high-performance solutions. What’s one "simple" logic problem that turned out to be way more complex than you expected? 🤔 #RomanNumeralDateConverter #FrontendEngineer #TypeScript #ReactJS #NextJS15 #WebDevelopment #TailwindCSS #JavaScript #Programming #TechStack #CodingLife #WebDesign #SoftwareEngineering #CalculatorAll #StateManagement

Behind the Screen – #32 Do you know? In JavaScript, almost everything runs on a #SingleMainThread. The main thread is responsible for: 👉 Executing JavaScript code   👉 Updating the DOM   👉 Handling user interactions (clicks, inputs)   👉 Rendering the UI  Since there is only one #MainThread, it can do only one task at a time. If a heavy task runs on the main thread: 👉 The UI becomes unresponsive   👉 Clicks and inputs are delayed   👉 The page may feel frozen  That’s why long operations should not block the main thread. Modern apps try to: • Break tasks into smaller #chunks   • Use #asynchronous operations   • #Offload heavy work when possible  🔥 A smooth user experience depends on keeping the main thread free. #javascript #webdevelopment #frontend #performance #softwareengineering

Built a small frontend project — a Gradient Generator 🎨 Focused on improving my understanding of DOM manipulation, event handling, and dynamic UI updates using JavaScript. ⚙️ Features: • Random gradient generation • Direction control • Live preview • One-click copy 🌐 Live Demo: https://lnkd.in/gcQSkiWS 📂 GitHub: https://lnkd.in/g8H34Ped A simple build, but a good step forward in strengthening fundamentals. #webdevelopment #frontend #javascript

𝗠𝗼𝘀𝘁 𝗥𝗲𝗮𝗰𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 𝗣𝗮𝘀𝘀 𝗧𝗼𝗼 𝗠𝗮𝗻𝘆 𝗣𝗿𝗼𝗽𝘀. A common mistake in React: Passing too many props. At first, it feels harmless. But over time, components start receiving: • Data they don’t use • Props passed through multiple layers • Unnecessary dependencies This makes components: • Harder to understand • Harder to reuse • Harder to maintain A simple rule I follow: 👉 Pass only what the component actually needs. Not the entire object. Not extra data “just in case.” Minimal props lead to: • Clearer component boundaries • Better reusability • Easier debugging Good React code isn’t about passing more data. It’s about passing the right data. 👇 Example comparison below Day 18/100 — sharing practical frontend engineering lessons. Do you pass full objects or only required fields? #ReactJS #FrontendArchitecture #JavaScript #CleanCode #SoftwareEngineering

Exploring #ArrowJS , a minimalist approach to modern frontend development ArrowJS is an experimental #JavaScript library for building reactive user interfaces using native JS, without the overhead of traditional frameworks. It challenges the idea that complex tooling is required to build powerful UIs. Key highlights: • ⚡ Ultra-lightweight (~3KB) with zero dependencies • 🧩 No build step, no virtual DOM, no custom templating language • 🔄 Reactive by choice — not by default • 🧠 Leverages modern JavaScript features like template literals, modules, and proxies • 🚀 Fast and simple, with a focus on developer ergonomics The core idea? JavaScript itself has evolved enough that we don’t always need heavy frameworks to create dynamic, performant applications. ArrowJS embraces that philosophy with a “less is more” approach. Worth checking out if you’re interested in lightweight alternatives to React/Vue or exploring new patterns in frontend architecture. #JavaScript #WebDevelopment #Frontend #SoftwareEngineering #Programming #WebDev #DeveloperTools #React #Vue