Sort IP addresses by octet order rather than the usual string sorting

ip-sort.js

#!/usr/bin/env node

function ipv4Compare(a, b) {
  let aOctets = a.split('.');
  let bOctets = b.split('.');
  if (aOctets.length !== 4 || bOctets.length !==4) {
    throw("InvalidIPv4Address");
  }

  if (parseInt(aOctets[0]) > parseInt(bOctets[0])) {
    return 1;
  }
  else if (parseInt(aOctets[0]) < parseInt(bOctets[0])) {
    return -1;
  }
  else if (parseInt(aOctets[1]) > parseInt(bOctets[1])) {
    return 1;
  }
  else if (parseInt(aOctets[1]) < parseInt(bOctets[1])) {
    return -1;
  }
  else if (parseInt(aOctets[2]) > parseInt(bOctets[2])) {
    return 1;
  }
  else if (parseInt(aOctets[2]) < parseInt(bOctets[2])) {
    return -1;
  }
  else if (parseInt(aOctets[3]) > parseInt(bOctets[3])) {
    return 1;
  }
  else if (parseInt(aOctets[3]) < parseInt(bOctets[3])) {
    return -1;
  }
  else {
    return 0;
  }
}

let ipAddrs = [
  '192.168.1.161',
  '192.168.1.1',
  '192.168.1.1',
  '172.16.10.2',
  '192.168.1.18',
  '1.1.1.1',
  '192.168.1.14',
  '10.10.1.1'
]

console.log("IP addresses:", ipAddrs);
console.log("IP addresses sorted:", ipAddrs.sort());
console.log("IP addresses custom sorted:", ipAddrs.sort(ipv4Compare));

// Append an invalid IPv4 value
ipAddrs.push('1.2.3');
console.log("Invalid IP address:", ipAddrs);
console.log("Invalid IP address sorted:", ipAddrs.sort());

// This will fail:
console.log("Invalid IP address custom sorted:", ipAddrs.sort(ipv4Compare));