JavaScript

const target = document.querySelector('div')

target.addEventListener('wheel', event => {
  const toLeft  = event.deltaY < 0 && target.scrollLeft > 0
  const toRight = event.deltaY > 0 && target.scrollLeft < target.scrollWidth - target.clientWidth

  if (toLeft || toRight) {
    event.preventDefault()
    event.stopPropagation()
    
    target.scrollLeft += event.deltaY
  }
})

  const target = useRef<HTMLDivElement>(null);

  const listenScrollEvent = (event) => {
    const toLeft = event.deltaY < 0 && target.current.scrollLeft > 0;
    const toRight =
      event.deltaY > 0 &&
      target.current.scrollLeft <
        target.current.scrollWidth - target.current.clientWidth;

    if (toLeft || toRight) {
      event.preventDefault();
      event.stopPropagation();

      target.current.scrollLeft += event.deltaY;
    }
  };

  return (
    <div ref={target} onWheel={listenScrollEvent}>

result = url.replace(/(^\w+:|^)\/\//, '');

const shuffleArray = (arr) => arr.sort(() => 0.5 - Math.random());
console.log(shuffleArray([1, 2, 3, 4]));
// Result: [ 1, 4, 3, 2 ]

const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());
isDateValid("December 17, 1995 03:24:00");
// Result: true

const copyToClipboard = (text) => navigator.clipboard.writeText(text);
copyToClipboard("Hello World");

const dayOfYear = (date) =>
  Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
dayOfYear(new Date());
// Result: 272

const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)
capitalize("follow for more")
// Result: Follow for more

const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)
dayDif(new Date("2020-10-21"), new Date("2021-10-22"))
// Result: 366

const clearCookies = document.cookie.split(';').forEach(cookie => document.cookie = cookie.replace(/^ +/, '').replace(/=.*/, `=;expires=${new Date(0).toUTCString()};path=/`));

const randomHex = () => `#${Math.floor(Math.random() * 0xffffff).toString(16).padEnd(6, "0")}`;
console.log(randomHex());
// Result: #92b008

const removeDuplicates = (arr) => [...new Set(arr)];
console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]));
// Result: [ 1, 2, 3, 4, 5, 6 ]

const getParameters = (URL) => {
  URL = JSON.parse('{"' + decodeURI(URL.split("?")[1]).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g, '":"') +'"}');
  return JSON.stringify(URL);
};
getParameters(window.location)
// Result: { search : "easy", page : 3 }

const timeFromDate = date => date.toTimeString().slice(0, 8);
console.log(timeFromDate(new Date(2021, 0, 10, 17, 30, 0))); 
// Result: "17:30:00"

const isEven = num => num % 2 === 0;
console.log(isEven(2)); 
// Result: True

const average = (...args) => args.reduce((a, b) => a + b) / args.length;
average(1, 2, 3, 4);
// Result: 2.5

const isNotEmpty = arr => Array.isArray(arr) && arr.length > 0;
isNotEmpty([1, 2, 3]);
// Result: true

const getSelectedText = () => window.getSelection().toString();
getSelectedText();

const isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches
console.log(isDarkMode) // Result: True or False

const scrollToTop = () => window.scrollTo(0, 0);

const scrollToBottom = () => window.scrollTo(0, document.body.scrollHeight);

const cToF = (celsius) => celsius * 9/5 + 32;
const fToC = (fahrenheit) => (fahrenheit - 32) * 5/9;

const [animateHeader, setAnimateHeader] = useState(false)

useEffect(() => {
  const listener = () =>
  window.scrollY > 140 ? setAnimateHeader(true) : setAnimateHeader(false)
  window.addEventListener('scroll', listener)
  return () => {
    window.removeEventListener('scroll', listener)
  }
}, [])

// Example usage with TailwindCSS:
<div className={`bg-header/75 transition duration-500 ease-in-out ${animateHeader && 'bg-header/[0.95]'}`}>...</div>

      const todos = {
        todo1: {
          isCompleted: true
        },
        todo2: {
          isCompleted: true
        },
        todo3: {
          isCompleted: true
        },
      };

	  // Check if the Object is not empty
      if (Object.keys(todos).length !== 0) {
        const allAreEqual = (todos) => {
          const res = []; // Create a new empty array
          // Loop through all the objects
          for (const key in todos) {
            const todo = todos[key];
            // Make sure the nested objects are objects and not strings or other...
            if (todo && typeof todo === 'object') {
              // Check if the property we're looking for exists in the nested object
              if (Object.prototype.hasOwnProperty.call(todo, 'isCompleted')) {
                // Add all the values from the nested objects in the array
                res.push(todo.isCompleted);
              }
            }
          }
			
          // .every returns a boolean if the condition is true
          // res array looks like this e.g.: ['true','true','true','true','false']
          // ['true','true','true','false'] = false
          // ['true','true','true','true'] = true
          return res.every((v) => v === true);
        };
        
        //return the result
        return allAreEqual(todos);
      }

const randomString = Math.random().toString(36).slice(2);
console.log(randomString); //output- r0zf1xfqcr (the string will be random )

let email = 'xyz@gmail.com';
le getDomain = email.substring(email.indexOf('@') + 1);

console.log(getDomain); // output - gmail.com

const elem = document.querySelector(' .text-input');

const isFocus = elem == document.activeElemnt;

/* isFocus will be true if elem will have focus, and isFocus will be false if elem will not have focus */

let arr1 = [];
let arr2 = [2, 4, 6, 8, 10];

const arr1IsEmpty = !(Array.isArray(arr1) && arr1.length >0);
const arr2IsEmpty = !(Array.isArray(arr2) && arr2.length >0);

console.log(arr1IsEmpty); //output - true
console.log(arr2IsEmpty); // output - false

const redirect = url => location.href = url

/* call redirect (url) whenever you want to redirect the user to a specific url */

let fruit = 'apple';
let fruits = ["apple", "banana", "mango", "orange", "grapes"];

const isArray = (arr) => Array.isArray(arr);

console.log(isArray.(fruit)); //output - false
console.log(isArray.(fruits)), //output- true