Teodor Angelov’s Post

🚀 A Clear Look Into How the Node.js Event Loop Actually Works Node.js delivers non-blocking performance not by running everything in parallel, but by using a highly optimized event loop that orchestrates asynchronous operations with precision. Here’s what the animation illustrates: 🔸 1. The Call Stack (V8 Engine)  All synchronous JavaScript executes here. Functions are pushed and popped in a strict LIFO manner. 🔸2. Offloading to libuv  When an async operation (like a DB query, file read, or network call) occurs, Node.js doesn’t block.  Instead, libuv—a C-based library—handles these operations in the background. 🔸 3. Event Queue  Once libuv completes an async task, its callback is sent to the event queue, waiting for its turn. 🔸4. The Event Loop Cycle  If the call stack is empty, the event loop pulls the next callback from the event queue and pushes it into the stack for execution. 🔸 5. Result  This orchestrated cycle allows Node.js to handle thousands of concurrent I/O operations with a single thread—without blocking the main execution flow. This model is the core reason why Node.js scales effectively, especially for APIs, real-time platforms, and event-driven systems. #NodeJS #EventLoop #JavaScript #BackendEngineering #SystemDesign #PerformanceEngineering #AsyncProgramming

🚀 Mastering the JavaScript Intersection Observer API! One of the most powerful yet underutilized APIs in modern web development is the Intersection Observer. Here's why it's a game-changer: ✨ Key Benefits: • Lazy load images efficiently without blocking the main thread • Trigger animations when elements enter the viewport • Implement infinite scroll with minimal performance impact • Track element visibility with extreme precision 💡 Real-World Use Cases: 📸 E-commerce sites loading product images on demand 🎬 Portfolio sites triggering animations as you scroll 📚 News feeds implementing endless scrolling ⚡ Performance optimization by reducing initial load time 🔧 The best part? No more scroll event listeners with countless redraws. Intersection Observer handles everything efficiently! #WebDevelopment #JavaScript #Frontend #Performance #Coding

🎯 A Little Story About JavaScript Events While working on a UI feature recently, I was thinking about how neatly JavaScript handles user interactions — especially through event flow. Imagine this 👇 You click a button inside a card component. The click first triggers on the button... but somehow, the parent card also reacts. That’s not magic — that’s Event Bubbling in action. In bubbling, the event starts at the target element and travels up through all its ancestors until it reaches the top of the DOM. There’s also the opposite path — Event Capturing — where the event moves down from the root to the target. You can enable this phase using: element.addEventListener("click", handler, true); And sometimes, you just want that click to stay right where it happened — no parents involved. That’s when event.stopPropagation() steps in to save the day ✋ Understanding how events travel through the DOM makes handling complex interfaces so much smoother. It’s one of those core concepts that quietly powers every interactive web experience we build. #JavaScript #Frontend #WebDevelopment #Coding #TIL

Meet Frosted Canvas 🎨 A lightweight JavaScript library for creating customizable, animated frosted-gradient backgrounds. It’s easy to embed in projects (npm-ready) and includes a live colour customizer for rapid iteration and export. Give your `divs` a great looking background 🤩 - Try the demo: https://lnkd.in/dpHnZpz9 - Customizer: https://lnkd.in/deHVRwru - Source code: https://lnkd.in/d7xwpEEk - Installation: https://lnkd.in/dBPeaQnK #WebDevelopment #Frontend #OpenSource #threejs

🖱️ Small details. Big impact. The cursor property in CSS might look simple — but it’s one of those underrated touches that can elevate your user experience instantly. Here’s a quick list of cursor types to level up your next project 👇 ✅ Interactive designs → pointer ✅ Loading states → progress / wait ✅ Editable fields → text ✅ Restricted actions → no-drop It’s the little polish that separates a developer from a craftsman. What’s your favorite “micro-detail” in frontend dev that makes a huge difference? 💭 #CSS #FrontendDeveloper #WebDevelopment #UserExperience #WebDesign #UIDesign #LearnToCode #TechEducation #FrontendTips #ProgrammingCommunity #CodeNewbie #DevTips #TechCreators #JavaScript

𝐔𝐧𝐝𝐞𝐫𝐬𝐭𝐚𝐧𝐝𝐢𝐧𝐠 𝐏𝐫𝐨𝐩𝐬 𝐏𝐚𝐬𝐬𝐢𝐧𝐠 𝐢𝐧 𝐑𝐞𝐚𝐜𝐭 - 𝐓𝐡𝐞 𝐑𝐢𝐠𝐡𝐭 𝐖𝐚𝐲 In React, components are like small, reusable building blocks. Every parent component can pass some information to its child components by giving them props. Props might remind you of HTML attributes, but you can pass any JavaScript value through them, including objects, arrays, and functions. To make them communicate, we use props. 𝐖𝐡𝐲 𝐮𝐬𝐞 𝐩𝐫𝐨𝐩𝐬? ✔ Reusability ✔ Dynamic UI ✔ Parent-controlled behavior #WebDevelopment #React #Javascript #Props #WebDesign

🔍 Mastering useRef for DOM Access Need to directly interact with DOM elements in React without triggering re-renders? Meet useRef - your gateway to direct DOM manipulation! 🎯 Why useRef rocks: const inputRef = useRef(null); const focusInput = () => { inputRef.current.focus(); }; return <input ref={inputRef} />; ✨ Key Superpowers: • Direct DOM element access without re-renders • Persists values across renders • Perfect for managing focus, selections, or media playback • Stores mutable values that don't affect rendering Common Use Cases: ✅ Managing input focus ✅ Integrating with third-party DOM libraries ✅ Storing interval/timeout IDs ✅ Tracking previous values ✅ Measuring DOM elements Pro Tip: Unlike state, updating useRef values doesn't trigger re-renders - making it perfect for values that don't affect visual output! #ReactJS #WebDevelopment #Frontend #JavaScript #Hooks #ReactHooks #CodingTips #WebDev #Programming #SoftwareEngineering #CleanCode #TechTips

Thales Domingues Tip 👇 Finally, ⚛️ React has provided a way to access the latest props and states in effects (useEffect/useLayoutEffect) without causing re-renders. The useEffectEvent hook will help achieve this. The hook helps extract non-reactive logic from useEffect webhooks. Non-reactive logic refers to when we don't want to perform any action. The useEffectEvent hook wraps a callback function and returns an Effect Event function, and whenever it gets called, the function has access to the latest props and state. So, it won't trigger a re-render, unlike in the case of dependency arrays. But it's not the replacement of the dependency array, as that is usually required to trigger effects. You should try it in your workflow as per the use cases. #react #javascript #frontend #hooks

Built a fun little Score Keeper using JavaScript and Bulma! This project helped me dive deeper into DOM manipulation, event handling, and clean UI design. Here’s a short demo, always satisfying to see code come to life! ⚡ #Coding #JavaScript #WebDev #Bulma #ProjectShowcase

Stop Duplicating Colors! Ever found yourself defining the same color in both SCSS and TypeScript? I’ve written a Medium article on how to fix this once and for all — by creating a single source of truth for your design tokens. Define colors once in colors.json Auto-generate both _colors.scss and colors.ts Access them in styles and TypeScript without duplication Works perfectly for design systems and theming Check it out here 👉 One Source to Rule Them All: Sharing Colors Between SCSS and TypeScript https://lnkd.in/eTkaXD_i #Angular #React #Vue #DesignSystem #WebDevelopment #Frontend #TypeScript #SCSS #WebDev #Coding