const str1 = '5';
console.log(str1.padStart(2, '0'));
// expected output: "05"
const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');
console.log(maskedNumber);
// expected output: "************5581"
//The padStart() method pads the current string with another string
//(multiple times, if needed) until the resulting string reaches the given
const hours='2'
console.log(hours.padStart(2, 0))
//console '02'
var n = 123
String("00000" + n).slice(-5); // returns 00123
("00000" + n).slice(-5); // returns 00123
(" " + n).slice(-5); // returns " 123" (with two spaces)const str1 = '123';
str1.padStart(3, '0'); // "00123"
str1.padStart(3, '*'); // "**123"