count-ip-addresses.js

function ipsBetween(start, end){
  // a place to store total number of addresses
  // split string on periods
  // iterate over octets
    // if octet is the same... move along
    // if it is not the same
      //
}

function ipToDecimal(ip) {
  let binary = '';
  // split on periods
  const octets = ip.split('.');
  octets.forEach(octet => {
    // convert each octet into binary 
    const binaryOctet = Number(octet).toString(2);
    // append to binary string
    binary += binaryOctet.padStart(8, '0');
  });
  
  // convert binary to decimal
  return parseInt(binary, 2);
}

function ipsBetween(start, end){
  // Bastiaan - suggestion from the YT chat!
  // convert to 32 bit integer
  return ipToDecimal(end) - ipToDecimal(start);
}

console.log(ipsBetween("10.0.0.0", "10.0.0.50"), 50);
console.log(ipsBetween("10.0.0.0", "10.0.1.0"), 256);
console.log(ipsBetween("20.0.0.10", "20.0.1.0"), 246);