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🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!)

🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!) Congratulations, developer! 👏 You’ve successfully completed the 45-Day React.js Roadmap — from understanding the fundamentals to mastering advanced concepts like Redux, Routing, Testing, and Deployment. 📘 What You’ve Learned ✅ React basics — Components, JSX, Props, and State ✅ Hooks — useState, useEffect, useRef, useMemo, and Custom Hooks ✅ Context API and Redux Toolkit for global state management ✅ Routing with React Router & Protected Routes ✅ Data fetching using Fetch API, Axios, React Query ✅ Advanced Patterns — Compound Components, Render Props, HOCs ✅ Styling — CSS Modules, Styled Components, Theming ✅ Animations, Accessibility, Testing, and Performance Optimization ✅ Deployment on Vercel, Netlify, or GitHub Pages 🧩 Final Project Ideas Now that you’re done, build real-world apps to polish your skills: 📝 Task ...
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🚀 Day 53: JavaScript Performance Optimization

🚀 Day 53: JavaScript Performance Optimization

Optimizing your JavaScript improves speed, user experience, and efficiency. Let's explore methods to write faster, more optimized code.

🔹 1. Minimize DOM Manipulations

Frequent DOM updates are expensive. Batch them or use DocumentFragment for better performance.

const list = document.getElementById("list");
const fragment = document.createDocumentFragment();

for(let i = 1; i <= 1000; i++) {
  const li = document.createElement("li");
  li.textContent = "Item " + i;
  fragment.appendChild(li);
}

list.appendChild(fragment);

🔸 2. Optimize Loops

Store length outside loops and avoid unnecessary computations inside.

const arr = [1,2,3,4,5];
for(let i = 0, len = arr.length; i < len; i++){
  console.log(arr[i]);
}

🔹 3. Use Local Variables

Accessing global variables is slower; use locals wherever possible.

🔸 4. Debouncing and Throttling

Reduce the frequency of function calls triggered by user actions (like scroll or resize).

function debounce(fn, delay){
  let timer;
  return function(...args){
    clearTimeout(timer);
    timer = setTimeout(()=>fn(...args), delay);
  };
}

window.addEventListener("resize", debounce(()=>console.log("Resized!"), 300));

🧪 Try it Yourself

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