#!/usr/bin/env node;
/******************************************************************************
 * This program masks all but the last four digits if a credit card number.
 * 
 * Copyright © 2021 Richard Lesh.  All rights reserved.
 *****************************************************************************/

const Utils = require('./Utils');

const TEST_CASES = ["1234 5678 9012 3456", "4893 8573 0203 1929", "6992 2839 4929 3902"];

function maskCreditCard(cardNumber) {
    return cardNumber.replaceAll(/\d{4,4} /g, "XXXX ");
}

const main = async () => {
    for (let s of TEST_CASES) {
        console.log(maskCreditCard(s));
    }
}
main().catch( e => { console.error(e) } );