Mastering useEffect with Dependency Arrays in React

⚠️ Most React developers are using the WRONG hook (and don’t even realize it)… If you're working with React, you've probably used useEffect everywhere… But did you know React also gives you useLayoutEffect - and using the wrong one can cause: ❌ UI flickering ❌ Layout glitches ❌ Unexpected behavior Here’s the simplest way to understand it: 👉 useEffect runs after the browser paints 👉 useLayoutEffect runs before the browser paints That’s it. But this tiny difference changes everything. 💡 Use useEffect for: API calls Logging Subscriptions 💡 Use useLayoutEffect for: Measuring DOM elements Updating layout before paint Avoiding visual flicker ⚠️ Pro tip: Don’t overuse useLayoutEffect — it blocks rendering and can hurt performance. I’ve broken it down with examples in the slides 👇 #React #Frontend #JavaScript #WebDevelopment #Programming #SoftwareEngineering

🚀 Starting a 10-part series on React things that make code harder than it needs to be. Not tutorials. Not “10 hooks you should know.” Just real patterns that show up in actual codebases and make simple work more annoying than it should be. Part 1: A lot of React problems are really state problems. Not React itself. Not JSX. Not even hooks most of the time. State living in too many places. Duplicated state. State doing jobs it was never supposed to do. That’s usually when an app starts feeling harder to reason about than it should. The more I work with React, the more I think good frontend code starts with good state decisions. If the state is messy, everything downstream gets harder: debugging feature work testing handoffs even basic collaboration Good React usually feels predictable. And predictable usually starts with state. What’s the most common state mistake you keep seeing? #React #ReactJS #StateManagement #FrontendEngineering #JavaScript #TypeScript #SoftwareEngineering

🚨 React devs… stop abusing useEffect 😵💫🛑 If your component has 3+ useEffect calls… that’s not “advanced React” 😬 that’s a warning sign ⚠️ For years, we’ve been treating useEffect like: 👉 “Solution to everything” Fetching data? useEffect. Updating state? useEffect. Deriving values? …also useEffect 😵 And then we wonder why: • Bugs feel random 🐛🎲 • Dependencies are confusing 🤯 • Infinite loops appear out of nowhere 🔁😩 Here’s the truth 💡 👉 useEffect is NOT for business logic. It’s for: ✅ Syncing with external systems (API, DOM, subscriptions) 🌐 ✅ Side effects - not state management ⚙️ That’s it. What to do instead 👇 ✨ Derive state directly during render ✨ Use event handlers for user actions ✨ Keep logic inside components - not effects React 19 makes this even clearer: Less need for effects… more predictable code 🧠⚛️ #reactjs #react19 #javascript #frontend #webdevelopment #programming

https://lnkd.in/dhXuQdTD — I used to think a Length Converter was the "Hello World" of apps. As a Senior Frontend Engineer working with TypeScript, I quickly realized that "simple" tools are where the devil is in the details. Building this for my platform, calculator-all.com, taught me a hard lesson about floating-point math and user trust. 📏 I was using React 19 and Tailwind CSS for the UI, keeping things snappy and responsive. ⚡ But a few users pointed out tiny precision errors when converting between obscure units. I had to dive deep into decimal logic to ensure a carpenter and a physicist could both trust the output. 💻 I used Cursor to iterate through edge cases and Vitest to write a suite of tests for over 20 different units. 🤖 Running everything on Bun and Vite made the development cycle incredibly fast, but the real work was in the logic. 🚀 I even had to account for how different locales format their numbers—something many basic tutorials skip. 🛠️ It’s funny how the tools we take for granted often require the most care behind the scenes. ✨ What’s the most "basic" feature you've built that turned out to be surprisingly complex? 📐 #LengthConverter #FrontendEngineer #TypeScript #ReactJS #WebDevelopment #SoftwareEngineering #Bun #Vite #TailwindCSS #React19 #Testing #Coding #JavaScript #UnitTesting #CalculatorAll

Avoiding Infinite Loops in useEffect 🔄 One of the most common hurdles I faced as a junior React developer was the dreaded infinite loop inside the useEffect hook. Here is how I learned to fix it: Always keep an eye on your dependency array! ❌ If you leave it out: The effect runs after every render. ✅ If it's empty []: The effect runs exactly once (on mount). ✅ If it has variables [data, id]: The effect runs only when those specific variables change. Understanding this simple rule saved me hours of debugging! What is a React bug that used to drive you crazy when you first started? 🐛 #ReactJS #FrontendDevelopment #CodingTips #100DaysOfCode #WebDev #react

I used to write React without knowing what was happening beneath the surface. Then I went down the rabbit hole of React internals. Fiber changed how I think about rendering, performance, and why React is designed the way it is. React Fiber is one of those things every React dev should understand but almost nobody does. Here's the full breakdown — reconciliation, scheduling, fiber nodes, double buffering — in 16 slides. If you're preparing for interviews or want to go beyond surface-level React… This is a must-know concept. Save this for later 🔖 #ReactJS #WebDevelopment #Frontend #JavaScript #ReactFiber #SoftwareEngineering #ProgrammingTips #LearnToCode #FrontendDevelopment #TechCarousel

React isn’t just a library—it’s a mindset. From breaking down complex UIs into reusable components to managing state with precision, React teaches you how to think in systems, not just screens. What looks like simple code on the surface is actually layers of logic, structure, and scalability working together behind the scenes. Just like any powerful tool, the real value of React isn’t in writing code—it’s in how you architect experiences. Build components. Think in flows. Design for scale. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #SoftwareEngineering

🚀 useState vs useReducer — When to use what in React? If you’ve worked with React, you’ve probably used useState a lot. But at some point, things start getting messy… and that’s where useReducer steps in. Let’s break it down 👇 🔹 useState Best for simple state Easy to read and quick to implement Great for inputs, toggles, counters Example: const [count, setCount] = useState(0); 👉 Use it when your state logic is straightforward. 🔹 useReducer Best for complex state logic Handles multiple related state updates Keeps logic predictable and organized Example: const [state, dispatch] = useReducer(reducer, initialState); 👉 Use it when: State depends on previous state You have multiple sub-values Logic gets complicated 💡 Think of it this way: useState = Simple & quick 🟢 useReducer = Structured & scalable 🔵 ✨ Pro Tip: If you find yourself writing too many setState calls or nested updates… it’s probably time to switch to useReducer. #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #CodingTips #ReactHooks

🚀 React Hooks Small Projects I recently worked on a few small projects to better understand some important React Hooks. In this video, I demonstrated how these hooks work with simple examples so that beginners can easily understand their usage. 🔹 useState – Used to manage state inside a functional component. It helps update and display dynamic data in the UI. 🔹 useEffect – Used to handle side effects in React applications such as API calls, timers, and updating the DOM when state changes. 🔹 useContext – Helps share data globally across components without passing props manually through every level. 🔹 useReducer – A powerful hook for managing complex state logic, especially when multiple state updates depend on different actions. 🔹 useMemo – Optimizes performance by memoizing expensive calculations so they only run when dependencies change. 🔹 useCallback – Returns a memoized function to prevent unnecessary re-renders when passing functions to child components. These mini projects helped me strengthen my understanding of React Hooks and component optimization techniques. 📌 If you watch the video, you can easily understand how each hook works in a practical way. #ReactJS #ReactHooks #WebDevelopment #MERNStack #JavaScript #FrontendDevelopment #CodingPractice

Understanding Props in React — The Backbone of Component Communication! When I started learning React, one concept that truly unlocked component reusability for me was Props 👇 🔹 Props (short for properties) allow you to pass data from one component to another 🔹 They make your UI dynamic and reusable 🔹 Think of them like arguments in a function Why Props Matter? Without props, every component would be static. With props, you can build scalable and flexible applications. Nishant Pal #ReactJS #WebDevelopment #FrontendDeveloper #JavaScript #CodingJourney #MERNStack #LearnToCode #DeveloperLife