Generate minimum 8 character password with at least one lowercase,one uppercase,one number and one special character.

function generatePassword() { let pass = '' const charArr = ['ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz', '0123456789', '@#$']; const str = charArr.join(''); for (let i = 0; i <= 8; i++) { const index = Math.floor(Math.random() * str.length + 1); pass += str.charAt(index) } if (!pass.checkExist(charArr[0])) { const x = Math.floor((Math.random() * 25) + 1); const upcChar=charArr[0].split('') console.log('upc',x,upcChar) pass+=upcChar[x] } if (!pass.checkExist(charArr[1])) { const x = Math.floor((Math.random() * 25) + 1); const lwcChar=charArr[1].split('') console.log('lwc',x,lwcChar) pass+=lwcChar[x] } if (!pass.checkExist(charArr[2])) { const x = Math.floor((Math.random() * 9) + 1); const numChar=charArr[2].split('') console.log('num',x,numChar) pass+=numChar[x] } if (!pass.checkExist(charArr[3])) { const x = Math.floor((Math.random() * 2) + 1); const splChar=charArr[3].split('') console.log('spl',x,splChar) pass+=splChar[x] } return pass; } console.log(generatePassword()) Output:- eYc$8O9Xf