chatGPT result on how to extract a domain from an url

extractDomainfromURL.js

function extractDomain(url) {
    let domain;
    // remove protocol
    if (url.indexOf("://") > -1) {
        domain = url.split('/')[2];
    }
    else {
        domain = url.split('/')[0];
    }

    // remove port number
    domain = domain.split(':')[0];

    // remove subdomain, keeping multi-level domains like co.uk
    const splitArr = domain.split('.');
    const arrLen = splitArr.length;

    // extracting the root domain here
    if (arrLen > 2) {
        domain = splitArr[arrLen - 2] + '.' + splitArr[arrLen - 1];
        // check to see if it's using a Country Code Top Level Domain (ccTLD) (i.e. ".me.uk")
        if (splitArr[arrLen - 2].length == 2 && splitArr[arrLen - 1].length == 2) {
            // this is using a ccTLD
            domain = splitArr[arrLen - 3] + '.' + domain;
        }
    }
    return domain;
}