Sending Email using google script - google-apps-script

Question

Can anyone help me with sending an email via google scripts?
Here the challenge I am facing is that the range of the first column (email) may go up to 1000 lists of the email addresses. Although, now it's working fine (for now) how can I make it a dynamic range of list to be fed over my email lists to the script.
Code:
// This constant is written in column C for rows for which an email
// has been sent successfully.
var EMAIL_SENT = 'Email Success!';
/**
* Sends non-duplicate emails with data from the current spreadsheet.
*/
function sendEmails2() {
var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Script (Beta)");
var startRow = 2; // First row of data to process
var numRows = 3; // Number of rows to process
// Fetch the range of cells A2:B3
var dataRange = sheet.getRange(startRow, 1, numRows, 3);
// Fetch values for each row in the Range.
var data = dataRange.getValues();
for (var i = 0; i < data.length; ++i) {
var row = data[i];
var emailAddress = row[0]; // First column
var message = row[1]; // Second column
var emailSent = row[2]; // Third column
if (emailSent !== EMAIL_SENT) { // Prevents sending duplicates
var subject = '[Auto] The Process Has Not Yet Been Started';
MailApp.sendEmail(emailAddress, subject, message);
sheet.getRange(startRow + i, 3).setValue(EMAIL_SENT);
// Make sure the cell is updated right away in case the script is interrupted
SpreadsheetApp.flush();
}
}
}
Doc Link

Answer 1

In order to make your range dynamic, you could use Sheet.getLastRow(), which returns the position of the last row with content.
Assuming that function sendEmails2 is the one your using for this, you would just have to modify the variable numRows. You would have to change this line:
var numRows = 3; // Number of rows to process
To this one:
var numRows = sheet.getLastRow() - startRow + 1;
Reference:
Sheet.getLastRow()
I hope this is of any help.