sifat009

/**
 * ✅ Topic: Unnecessary useMemo() on props 🧐
 * 📨 For training contact: sifathaque6@gmail.com 💬
 */

const ChildrenMemo = React.memo(Children)

const Parent = () => {
  const value = useMemo(() => ({value}));
  

sifat009

// Problem

function App() {
  const [scrollY, setScrollY] = useState(0);
  
  function handleScroll(event) {
    setScrollY(...);
  }
  
  return (

sifat009

/**
 * ✅ Topic: Create Map with timer in javascript 🎉
 * 📨 For personalized training contact: sifathaque6@gmail.com 💬
 */

class MapWithTimer extends Map {
	#timerRefMap = new Map();

	// time in milliseconds
	set(key, value, time = 1000) {

sifat009

/**
 * ✅ Topic: Create Strange Object in javascript 🧐
 * 📨 For personalized training contact: sifathaque6@gmail.com 💬
 */

function createStrageObject() {
	return new Proxy(
		{},
		{
			get(_, prop) {

sifat009

/**
 * ✅ Topic: Proxy in javascript
 * 📨 For personalized training contact: sifathaque6@gmail.com 💬
 */

const arrayHandler = {
	get: function (arr, property) {
		if (property < 0) {
			return arr[arr.length + parseInt(property)];

sifat009

/**
 * ✅ Topic: Using Promise.race() to implement request timeout 🎉
 * ⭐️ Email: 📨 sifathaque6@gmail.com 👈
 */

const data = Promise.race([
	fetch('https://jsonplaceholder.typicode.com/todos/1'),
	new Promise((resolve, reject) => {
		// Reject after 5 seconds
		setTimeout(() => reject(new Error('Request timed out')), 5000);

sifat009

/**
 * ✅ Topic: Promise.allSettled in javascript 🎉
 * ⭐️ Email: 📨 sifathaque6@gmail.com 👈
 */

const promises = [
	fetch('/quit-social-media'),
	fetch('/wake-up-early'),
	fetch('/go-to-bed-early')

sifat009

/**
 * ✅ Topic: async/await coding challenge in javascript 🎉
 * ⭐️ Email: 📨 sifathaque6@gmail.com 👈
 */

// ✅ Rewrite the following code using async/await

function getUsersData() {
	fetch('/users')

sifat009

/**
 * ✅ Topic: Some interesting facts about (undefined and null) in javascript 🎉
 * ⭐️ Email: 📨 sifathaque6@gmail.com 👈
 */

// ✅ JSON.stringify() converts undefined to null if used as an array value
const str = JSON.stringify([null, undefined]);
// ➡️ str = [null,null] 😮 (undefined is converted to null)

sifat009

/**
 * ✅ Topic: Intl.RelativeTimeFormat in javascript 🎉
 * ⭐️ Email: 📨 sifathaque6@gmail.com 👈
 */

const rtf1En = new Intl.RelativeTimeFormat('en');

console.log(rtf1En.format(5, 'year')); // in 5 years
console.log(rtf1En.format(-5, 'year')); // 5 years ago