Understanding event.target vs event.currentTarget in JavaScript

Most developers use JavaScript events every day… but many don’t actually understand how events travel in the DOM. When you click a button inside a div, which runs first? The button? The parent div? The document? The answer depends on Event Bubbling vs Event Capturing. ⚡ Event Bubbling (default) The event starts from the target element and moves upward through its parents. Example flow: button → div → body → document ⚡ Event Capturing The event starts from the top parent and moves down to the target. Example flow: document → body → div → button 💡 Most applications rely on bubbling, which also powers event delegation. Understanding this concept helps you: • Debug event issues faster • Write cleaner event delegation • Control complex UI interactions Frontend engineering is not just about writing code — it’s about understanding how the browser actually works. Follow for more JavaScript & Frontend deep dives. #javascript #frontenddeveloper #webdevelopment #100daysofcode #learninpublic #softwaredevelopment #coding

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

https://lnkd.in/dP7RkzD3 — As a Senior Frontend Engineer, I’ve realized that building a robust pressure converter in TypeScript is all about the "Base Unit" pattern. Most people think it’s just multiplying a few numbers, but handling floating-point precision across 15+ units can get messy fast. Here is the logic deep-dive I used for this tool: 1. Standardize everything to Pascal (Pa) as the global "source of truth." 2. Apply conversion constants from the Pa base to the target unit (like PSI, Bar, or Torr). 3. Use a custom rounding utility to prevent those dreaded 0.9999999999998 floating-point errors. I remember failing a fluid mechanics quiz back in college because I forgot to convert kilopascals to atmospheres correctly. 📐 Building this tool was my way of making sure nobody else has to do that stressful math manually ever again. 🧪 I built the UI using Next.js 15 and Tailwind CSS, ensuring the experience is snappy and responsive on any device. 💻 By leveraging Radix UI for accessible input components and Bun as my local runtime, I was able to iterate on the math logic incredibly fast. I even used Cursor to pair-program the more obscure conversion factors while Vite kept the local dev environment lightning fast. 💨 It’s one of 300+ tools I’ve built to simplify life for developers and engineers globally. 🚀 What’s the most frustrating unit conversion you’ve ever had to code from scratch? 🧠 #PressureConverter #FrontendEngineer #TypeScript #ReactJS #NextJS #TailwindCSS #Engineering #MathTools #WebDev #Coding #SoftwareEngineering #UnitConversion #RadixUI #Bun #Vite

https://lnkd.in/dHp9sfCx — Calculating volume shouldn't feel like a high school math test you're failing. As a Senior Frontend Engineer building with Next.js 15 and TypeScript, I’ve realized that "simple" tools are often the hardest to get right. 📐 I recently shipped the Volume Calculator, and it reminded me why the modern baseline for quality is so high. Most people think it’s just length times width times height. 💻 But when you support spheres, frustums, and capsules, the math logic can get messy very quickly. I used Cursor and Vercel v0 to rapidly prototype the interface with shadcn/ui and Tailwind CSS. The real challenge wasn't the UI—it was the floating-point precision. 🧪 I spent hours writing unit tests in Vitest to ensure that complex shapes didn't suffer from rounding errors that could ruin a construction project. I remember back in my university days, I actually built a physical cardboard cylinder just to manually verify a volume formula I was coding. 📏 I still bring that same "verify everything" obsession to every tool I build for calculator-all.com today. 🏗️ Building 300+ tools isn't just about quantity; it's about making sure the 301st tool is more robust than the first. 🚀 What’s an "easy" feature you built that turned out to be a total technical rabbit hole? 🧠 #VolumeCalculator #FrontendEngineer #TypeScript #ReactJS #NextJS #WebDev #CodingLife #SoftwareEngineering #UnitTesting #TailwindCSS #UIUX #OpenSource #DevCommunity #CleanCode #MathTools

https://lnkd.in/dhxqAUpC — Most devs think math is easy until they hit floating-point errors. As a Frontend Engineer building with TypeScript and Next.js 15, I thought this would be a simple "plug and play" math tool. 💻 I was wrong. Calculating the tangent of 90 degrees or handling IEEE 754 precision issues is where the real engineering starts. 📐 I remember a 2 AM session where my code insisted that sin(π) was not quite zero, breaking the entire UI layout. ☕ I used Cursor to iterate through the edge-case logic and Vitest to ensure every angle returned the exact precision users expect. 🛠️ Styling the unit circle and results was a breeze with Tailwind CSS, keeping the bundle size incredibly light. 🚀 Even though my local dev setup runs on Vite for speed, the final deployment to Vercel ensures the production performance is rock solid. Building this taught me that the "simplest" tools often hide the most complex logic under the hood. ✅ It’s one more step toward making calculator-all.com the ultimate resource for everyone. 🌟 What’s the most "simple" feature you’ve built that turned out to be a total rabbit hole? #TrigonometryCalculator #FrontendEngineer #TypeScript #ReactJS #NextJS #WebDevelopment #Coding #SoftwareEngineering #TailwindCSS #Vercel #UnitTesting #JavaScript #Math #BuildInPublic #CalculatorAll

A clean 𝐟𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐟𝐨𝐥𝐝𝐞𝐫 𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 can save hours of debugging and development time. When projects grow, organizing code properly becomes just as important as writing the code itself. A scalable frontend architecture usually includes: • Components → Reusable UI elements • Pages → Application views or routes • Hooks → Custom logic and reusable behaviors • Services → API calls and business logic • Context / Redux → State management • Utils → Helper functions • Assets → Static resources Good structure = 𝐛𝐞𝐭𝐭𝐞𝐫 𝐬𝐜𝐚𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲, 𝐦𝐚𝐢𝐧𝐭𝐚𝐢𝐧𝐚𝐛𝐢𝐥𝐢𝐭𝐲 𝐚𝐧𝐝 𝐜𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐢𝐨𝐧. Before adding new features, ask yourself: 💡 "Will my folder structure still make sense when this project grows 10x?" How do you usually structure your frontend projects? #FrontendDevelopment #ReactJS #WebDevelopment #JavaScript #SoftwareArchitecture #CodingBestPractices #Developers #Programming #TechTips

SlideAuth provides a fast and smooth sliding authentication experience using optimized CSS transforms and minimal JavaScript to ensure a seamless, modern user journey. Check out the code here: https://lnkd.in/eWBwKZAQ #WebDevelopment #Frontend #UIUX #JavaScript #CSS #Programming #SoftwareEngineering #SlideAuth

JavaScript isn’t truly “multithreaded”… it just fakes it brilliantly. The Event Loop is the brain behind that illusion. Here’s the real game happening under the hood: • Call Stack → Executes synchronous code first • Microtask Queue → Promises, queueMicrotask, process.nextTick() • Macrotask Queue → setTimeout, setInterval, I/O, UI events The rule most devs miss: Microtasks always run before Macrotasks. Which leads to something interesting called Starvation. If microtasks keep getting added endlessly (like chained Promises), the event loop keeps prioritizing them… and macrotasks like setTimeout might wait longer than expected. So the order looks like this: Sync Code → Microtasks → Macrotask → repeat. Understanding this isn’t just theory. It explains why your async code sometimes behaves like it’s possessed. JavaScript looks simple on the surface. Underneath, it’s a tiny scheduler juggling tasks like a caffeinated circus performer. #javascript #webdevelopment #frontend #reactjs #nodejs #coding #programming #eventloop #asyncjavascript #developers

💡 One concept that completely changed the way I understand JavaScript: The Event Loop At some point, almost every frontend developer writes code like this: console.log("Start"); setTimeout(() => { console.log("Timeout"); }, 0); Promise.resolve().then(() => { console.log("Promise"); }); console.log("End"); Many people expect the output to be: Start Timeout Promise End But the real output is actually: Start End Promise Timeout And this is where the JavaScript Event Loop becomes really interesting. ⚙️ JavaScript is single-threaded, which means it can only execute one thing at a time. But at the same time, it handles asynchronous operations like timers, API calls, and promises very smoothly. How does it do that? Through a system built around three main parts: 📌 Call Stack – where synchronous code runs. 📌 Microtask Queue – where promises are placed. 📌 Task Queue (Macrotasks) – where things like setTimeout go. The simplified flow looks like this: 1️⃣ JavaScript executes everything in the Call Stack first. 2️⃣ Then it processes Microtasks (Promises). 3️⃣ Only after that it handles Macrotasks like setTimeout. So even if setTimeout has a delay of 0, it still waits until the stack is empty and microtasks are finished. This small detail explains many things developers experience like: 🔹 "Why did my setTimeout run later than expected?" 🔹 "Why do Promises resolve before timers?" 🔹 "Why does async code sometimes behave strangely?" Once you truly understand the Event Loop, debugging asynchronous JavaScript becomes much easier. For me, it was one of those moments where a confusing behavior suddenly made perfect sense. 🤯 Curious to hear from other developers: ❓ When did the Event Loop finally “click” for you? #javascript #frontend #webdevelopment #programming #softwareengineering #eventloop #asyncjavascript #coding #developers #frontenddeveloper

🚀 Mastering Event Propagation in JavaScript One concept that truly leveled up my frontend debugging skills is Event Propagation. After going deep through multiple resources, medium articles, and most importantly — hands-on practice — I can confidently say: 👉 Understanding this concept separates average developers from strong problem solvers. Let me break it down simply: 🔹 Event Propagation = How events travel in the DOM There are 3 phases: 1️⃣ Capturing Phase (Top → Down) 2️⃣ Target Phase (Element itself) 3️⃣ Bubbling Phase (Bottom → Up) Most of us unknowingly work with event bubbling daily. 💡 Example: parent.addEventListener("click", () => console.log("Parent")); child.addEventListener("click", () => console.log("Child")); Clicking the child logs: Child Parent 👉 Why? Because of bubbling 🔥 Real Interview + Practical Insights: ✔️ How to stop propagation? event.stopPropagation(); ✔️ When to use capturing? addEventListener("click", handler, true); ✔️ Difference between: stopPropagation() stopImmediatePropagation() ✔️ Event delegation (used in dynamic lists, tables, large apps) ⚡ Real-world use cases I’ve handled: Fixing unwanted parent clicks in nested components Optimizing performance using event delegation Debugging complex UI interactions in large React apps 💬 My takeaway after mastering this: Understanding how events flow makes debugging 10x faster and your code more predictable. If you're preparing for frontend interviews: 👉 Don’t just memorize — visualize the flow and practice it in real DOM scenarios Happy to connect with fellow developers and discuss more 🚀 #javascript #frontend #webdevelopment #interviewpreparation #reactjs