Find primary MAC Address for a given machine

primaryMAC.js

function findPrimaryMac(adapters, burnedInOnly) {
    // Only interested in adapters with MAC addresses
    adapters = adapters.filter((adapter) => adapter.mac);
    if(burnedInOnly) {
        adapters = sift.keep(adapters, {burnedIn: true });
    }
    // find best match (see https://github.com/qzind/sift/issues/12)
    if(adapters.length > 1) {
        // First, blindly trust what Java says the primary adapter is
        for(var i in adapters) {
            if(adapters[i].primary) {
                console.debug("Trusting primary adapter as reported by QZ Tray");
                return adapters[i];
            }
        }

        console.debug(ipv4s);
        // Next, filter adapters without a valid IPv4 value
        var ipv4s = adapters.filter((adapter) => adapter.ipv4 && adapter.ipv4 != "127.0.0.1");
        if(ipv4s.length == 1) {
            console.debug("Assuming primary adapter is the only adapter with a valid IPv4 value");
            return ipv4s[0];
        }

        console.debug(ipv4s);
        // Next, filter adapters without "Virtual" in the name
        var novirt = ipv4s.filter((adapter) => adapter.interface && adapter.interface.toLowerCase().indexOf("virtual ") === -1);
        if(novirt.length == 1) {
            console.debug("Assuming primary adapter is the only adapter without 'virtual' in the name");
            return novirt[0];
        }

        console.debug("Trouble finding a primary " + (burnedInOnly ? "" : "non-") + "burned-in MAC address for this machine.");
        return null;
    }
    return adapters[0];
}

var primaryAdapter = findPrimaryMac(adapters, true) || findPrimaryMac(adapters, false);
var primaryMac = primaryAdapter && primaryAdapter.mac;

console.log("Primary MAC is", primaryMac);