padding string left javascripts code example

Example 1: how to pad string js

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"

Example 2: string padStart padEnd

let string = ‘Alice’; 
// padStart() — we assume our string needs to have 10 characters 
string.padStart(10, ‘o’); // returns ‘oooooAlice’
// padEnd() 
string.padEnd(10, ‘o’); // returns ‘Aliceooooo’;