Re: [Apps-Script] compare existing data to new data

Hello,

I am trying to append only unique rows to the sheet, by comparing existing data in the sheet with the new data being collected. It appends the same duplicate rows. Not sure what types of checks I can use along the way to ensure the comparison is in fact the same for the existing and new data. Thanks in advance for this concern. Take care.

function cleanAndProcessMonthSheet_(monthSheet, accountsLastCol, accountsCol, lastCol, sheetUniqueValues) {
  console.log('Checking to see if there are any duplicate rows.');

  // **Clean account names and update the month sheet**
  // Get all account names starting from row 1 (no header in monthly sheets)
  const lastRow = monthSheet.getLastRow();
  if (lastRow < 1) {
    console.log("No data rows to process in the month sheet.");
    return;
  }

  // Get the account types and clean them
  const accountTypesRange = monthSheet.getRange(1, accountsCol, lastRow, 1); // Start from row 1
  const accountTypes = accountTypesRange.getValues();
  const updatedAccountTypes = accountTypes.map(row => [cleanAccountName_(row[0])]); // Clean and convert to uppercase

  // Update the specified last column (lastCol) with the cleaned values, starting from row 1
  monthSheet.getRange(1, lastCol, updatedAccountTypes.length, 1).setValues(updatedAccountTypes);
  console.log("Cleaned account names updated in the last column.");

  // **Retrieve all unique account names and store them in the provided Set**
  const accountNames = monthSheet.getRange(1, accountsLastCol, lastRow, 1).getValues().flat().filter(Boolean);
  accountNames.forEach(value => sheetUniqueValues.add(value));

  // **Retrieve all the data in the sheet and check for duplicate rows**
  const dataRange = monthSheet.getDataRange();
  const values = dataRange.getValues();

  const uniqueRows = [];
  const uniqueRowsSet = new Set();

  values.forEach(row => {
    const rowString = row.join(); // Create a simple unique string representation of the row
    if (!uniqueRowsSet.has(rowString)) {
      uniqueRows.push(row); // Add only unique rows
      uniqueRowsSet.add(rowString);
    }
  });

  // **Overwrite the sheet with unique rows if duplicates were found**
  if (uniqueRows.length < values.length) {
    console.log("Duplicate rows found. Removing duplicates.");
    monthSheet.getRange(1, 1, uniqueRows.length, uniqueRows[0].length).setValues(uniqueRows);
    console.log("Successfully removed duplicates and updated the sheet.");
  } else {
    console.log("No duplicates found, no changes made.");
  }
}

For a bit more information I don't know if writing to the sheet -   monthSheet.getRange(1, lastCol, updatedAccountTypes.length, 1).setValues(updatedAccountTypes);

  console.log("Cleaned account names updated in the last column."); is happening at the wrong time and affecting the comparison? Basically the last column in the sheet has been processed to be in uppercase. 

Not sure if this is already the case for the new data when the comparison happens? Or should I ignore the last column in the existing data and new data for the comparison.

I have another approach that writes the new data and then a function runs to remove the duplicate rows, but that seems counterintuitive. Any help or suggestions are appreciated. Take care.

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