how to pad string js 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, '*');

// expected output: "************5581"

Here is what the above code is Doing:
1. We’re using the slice() method to extract the last 4 digits of the credit card number.
2. We’re using the padStart() method to add the remaining digits back to the string, but replacing them with asterisks (*).
3. We’re using the length property to tell the padStart() method how many total characters the final output string should have.

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