Google Sheets script to remove duplicate rows related to MAC, IP addresses, and Semantic Versioning

removeDuplicates.gs

function isNewerVersion(oldVer, newVer) {
  const oldParts = oldVer.split('.');
  const newParts = newVer.split('.');
  for (var i = 0; i < newParts.length; i++) {
    const a = ~~newParts[i];  // parse int
    const b = ~~oldParts[i];  // parse int
    if (a > b) return 1;
    if (a < b) return -1;
  }
  return 0
}

function removeDuplicates() {
  const sheet = SpreadsheetApp.getActiveSheet()
  const range = sheet.getDataRange(); 
  const values = range.getValues().slice(1);  // skip header
  let newRows = {};
  let ips = {};
  
  // remove rows with no MAC or Version  
  values.forEach(row => {
                 let mac = row[0].toString();
                 let ip = row[1].toString();
                 // check if mac is a duplicate, use MD5 as well in case user is using old version of MC
                 
                 // check for duplicate ip address
                 if (ip in ips) mac = ips[ip];
                 // hash mac if unhashed
                 else if (mac.includes(':')) mac = MD5(mac);

                 if (mac in newRows) { 
                   // set row to latest version
                   
                   if (isNewerVersion(row[2], newRows[mac][2])) {
                     // keep row with the latest version
                     newRows[mac] = row.slice(0, 5);
                   }
                 } else if (mac !== '') {  // add to newRows if MAC is defined
                   // set row[0] to hashed mac
                   row[0] = mac;
                   newRows[mac] = row.slice(0, 5);
                   ips[ip] = mac;
                 }
               });
  
  newRows = Object.values(newRows);
  newRows.sort((left, right) => isNewerVersion(left[2], right[2]));

  // delete all rows (except header);
  sheet.deleteRows(2, values.length);  // index starts at 1
  
  // add cleaned values
  const newRange = sheet.getRange(2, 1, Object.keys(newRows).length, 5);
  
  newRange.setValues(newRows);
  // set font weight no normal since it might be bold
  newRange.setFontWeight('normal');
}


function MD5(input) {
  const rawHash = Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, input);
  let txtHash = '';
  for (i = 0; i < rawHash.length; i++) {
    let hashVal = rawHash[i];
    if (hashVal < 0) {
      hashVal += 256;
    }
    if (hashVal.toString(16).length == 1) {
      txtHash += '0';
    }
    txtHash += hashVal.toString(16);
  }
  return txtHash;
}