Jake O.’s Post

🚀 CRUD System Project عملت مشروع CRUD System باستخدام HTML – CSS – JavaScript Features: ✔ Create / Update / Delete Products ✔ Search (Title & Category) ✔ Sort Data ✔ LocalStorage ✔ Light & Dark Mode 🔗 Demo / GitHub:https://lnkd.in/dATnWmZ8 #JavaScript #Frontend #CRUD #WebDevelopment

Designed a React search bar with autocomplete using hardcoded data. The goal was to clearly visualize how state, events, and rendering work together. Thought process: • First, store user input → use useState • Listen to typing events → onChange handler • Filter hardcoded data based on input → Array.filter() • Update suggestions state → setSuggestions • Render results conditionally → map() + conditional rendering https://lnkd.in/gnGSFuNp #ReactJS #FrontendDevelopment #LowLevelDesign #JavaScript

Most developers don’t know this, but JavaScript has structured cloning built in. You can safely copy complex objects without JSON.stringify. const copy = structuredClone(original) It handles: Maps and Sets Dates and RegExps nested objects circular references Why this matters: JSON drops types breaks dates and fails on circular data This is how browsers copy data between threads and workers. If you’ve ever written “deep clone utility” code you probably didn’t need to. Sometimes the platform already solved it. #JavaScript #WebDevelopment #CleanCode #Frontend #Backend

🚨 This is the kind of React code you only write after being burned in production. At some point, you realize that data fetching isn’t about “getting data”. It’s about cancellation, race conditions, cache safety, and component lifecycles. Here’s a simplified version of a hook I’ve used in production 👇 ``` function useSafeAsync<T>(asyncFn: (signal: AbortSignal) => Promise<T>) {  const abortRef = React.useRef<AbortController | null>(null);  const mountedRef = React.useRef(true);  React.useEffect(() => {   return () => {    mountedRef.current = false;    abortRef.current?.abort();   };  }, []);  const run = React.useCallback(async () => {   abortRef.current?.abort(); // cancel previous request   const controller = new AbortController();   abortRef.current = controller;   try {    const result = await asyncFn(controller.signal);    if (!mountedRef.current) return;    return result;   } catch (e: any) {    if (e.name === 'AbortError') return;    throw e;   }  }, [asyncFn]);  return run; } ``` 🧠 Why this code exists Because in real apps: -Components unmount while requests are in flight -Users trigger the same action multiple times -Slow networks expose race conditions -“Can’t perform a React state update on an unmounted component” will happen -This hook explicitly handles: ✅ Request cancellation ✅ Stale responses ✅ Component lifecycle safety #JavaScript #WebDevelopment #FrontendTips #IntlAPI #CodeSmart #ReactJs #Frontend #FullStack #Developer #coding #components #WebDevelopment #CleanCode #DevTips #OneLiners #100DaysOfCode #JavaScript #LinkedInTechCommunity 

𝐀𝐫𝐞 𝐲𝐨𝐮𝐫 useEffect 𝐡𝐨𝐨𝐤𝐬 𝐫𝐮𝐧𝐧𝐢𝐧𝐠 𝐰𝐢𝐥𝐝 𝐰𝐢𝐭𝐡 𝐢𝐧𝐟𝐢𝐧𝐢𝐭𝐞 𝐥𝐨𝐨𝐩𝐬 𝐨𝐫 𝐬𝐭𝐚𝐥𝐞 𝐝𝐚𝐭𝐚? 𝐓𝐡𝐞 𝐜𝐮𝐥𝐩𝐫𝐢𝐭 𝐦𝐢𝐠𝐡𝐭 𝐛𝐞 𝐲𝐨𝐮𝐫 𝐟𝐮𝐧𝐜𝐭𝐢𝐨𝐧 𝐝𝐞𝐩𝐞𝐧𝐝𝐞𝐧𝐜𝐢𝐞𝐬. I've seen so many developers get tripped up by functions defined inside their React components and then used in a `useEffect`'s dependency array. Every re-render creates a new function instance, even if the logic hasn't changed. This tells `useEffect` that its dependency has changed, triggering it again... and again. Hello, render loop hell. The Fix? `useCallback` ```javascript // Before (Problematic) function MyComponent() { const [data, setData] = useState([]); const fetchData = async () => { /* ... fetch logic ... */ }; // New func on every render useEffect(() => { fetchData(); }, [fetchData]); // 'fetchData' always changes! } // After (Optimized) function MyComponent() { const [data, setData] = useState([]); const fetchData = useCallback(async () => { /* ... fetch logic ... */ }, []); // Memoized useEffect(() => { fetchData(); }, [fetchData]); // 'fetchData' only changes if its *own* dependencies change } ``` By wrapping `fetchData` with `useCallback`, you memoize the function. React now provides the same function instance across re-renders (unless `useCallback`'s own dependencies change), preventing unnecessary `useEffect` re-runs and keeping your app performant. It's a small change with a big impact on complex components or those with frequent updates. What's your go-to strategy for managing `useEffect` dependencies in large applications? #React #Frontend #JavaScript #TypeScript #WebDevelopment

⚡ Stop using .filter() and .map() together. Your bundle size will thank you. I've seen this pattern in 100+ React codebases this year: const users = data .filter(user => user.active) .map(user => <UserCard {...user} />); Looks clean. Feels right. But here's the problem? Your code loops through that array TWICE. Your browser processes it twice. Your bundle gets heavier. ━━━━━━━━━━━━━━━━━━━━━━━━━ The Issue: ❌ Two iterations over same array ❌ Creates intermediate arrays in memory ❌ Slows down large datasets ❌ Unnecessary re-renders ━━━━━━━━━━━━━━━━━━━━━━━━━ The Better Way: ✅ Use reduce() → Single loop ✅ Cleaner code, fewer dependencies ✅ Smaller bundle size ✅ Better edge case handling ━━━━━━━━━━━━━━━━━━━━━━━━━ Why This Matters: • Performance: Only loops once • Dependencies: Zero extra libraries • Bundle Size: Noticeably smaller • Scalability: Handles 10K+ items smoothly Master the basics before reaching for optimization libraries. ━━━━━━━━━━━━━━━━━━━━━━━━━ 💬 Question for you: Do you prefer readability (.filter().map()) or performance (reduce())? Is there a middle ground I'm missing? Let's debate in the comments. 👇 #JavaScript #ReactJS #WebDevelopment #CodingTips #Performance #FrontendDevelopment #BestPractices #Coding #TechTips #DeveloperCommunity

Performance vs. Readability: at the end of the day, both are O(n). While .reduce() avoids intermediate array allocations, modern JIT engines like V8 optimize these patterns so heavily that the overhead is often negligible for most use cases. In 4 years of building critical digital solutions, I’ve learned that "clever" code usually costs more in developer maintenance and debugging than it saves in micro-seconds of execution. Unless you’re handling massive datasets where memory pressure is a verified bottleneck, prioritize the human reader. Premature optimization is the root of unnecessary complexity. Always profile your system before sacrificing legibility.

⚡ Stop using .filter() and .map() together. Your bundle size will thank you. I've seen this pattern in 100+ React codebases this year: const users = data  .filter(user => user.active)  .map(user => <UserCard {...user} />); Looks clean. Feels right. But here's the problem? Your code loops through that array TWICE. Your browser processes it twice. Your bundle gets heavier. ━━━━━━━━━━━━━━━━━━━━━━━━━ The Issue: ❌ Two iterations over same array ❌ Creates intermediate arrays in memory ❌ Slows down large datasets ❌ Unnecessary re-renders ━━━━━━━━━━━━━━━━━━━━━━━━━ The Better Way: ✅ Use reduce() → Single loop ✅ Cleaner code, fewer dependencies ✅ Smaller bundle size ✅ Better edge case handling ━━━━━━━━━━━━━━━━━━━━━━━━━ Why This Matters: • Performance: Only loops once • Dependencies: Zero extra libraries • Bundle Size: Noticeably smaller • Scalability: Handles 10K+ items smoothly Master the basics before reaching for optimization libraries. ━━━━━━━━━━━━━━━━━━━━━━━━━ 💬 Question for you: Do you prefer readability (.filter().map()) or performance (reduce())? Is there a middle ground I'm missing? Let's debate in the comments. 👇 #JavaScript #ReactJS #WebDevelopment #CodingTips #Performance #FrontendDevelopment #BestPractices #Coding #TechTips #DeveloperCommunity

👋 Hey LinkedIn fam! Today I learned about parsing JSON in JavaScript — something super common when working with APIs, databases, or any data exchange on the web. 🔍 Key takeaway: JSON.parse() → converts JSON string ➝ usable JavaScript object JSON.stringify() → converts JavaScript object ➝ JSON string JSON is lightweight, human-readable, and one of the most widely used formats for sending data between client and server. Understanding how to parse it is essential for real-world projects 🚀 #JavaScript #JSON #WebDevelopment #LearningJourney #Frontend

See my latest blog on how useEffect behaves — and how its cleanup runs — when a component mounts, updates, and unmounts with its different second parameters — no dependency, empty array, and dependency array. #ReactJS #ReactHooks #UseEffect #CleanCode #JavaScript