Prevents sending duplicates- is not working - google-apps-script

Question

I have created a script which sends automated email based on cell values, created for an approval workflow.
Script is working fine, however, I am not able to prevent sending duplicate emails
Please help with some tips
//
var now = new Date();//mail semt date
var EMAIL_SENT = "EMAIL_SENT";// mail sent status
var approvalstatus = 'Approved';// Approved Status
function SecondaryApproval() {
var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 2; // First row of data to process
var numRows = 100; // Number of rows to process
var dataRange = sheet.getRange(startRow, 1, numRows, 16)
var data = dataRange.getValues();
for (var i = 0; i < data.length; ++i) {
var row = data[i];
var Ticket = row[0];
var RequesterEmail = row[2];
var Item = row[3];
var emailAddress = row[6]; // First column
var message = row[7]; // Second column
var emailSent = row[8]; // Third column
var date = row[9];
var yesNo = row[5];
if (yesNo === approvalstatus) {
var subject = "Secondary Approval ";
GmailApp.sendEmail(emailAddress, subject, "Dear " + + "RequesterEmail" + Ticket + ", \n\nThis is an email report of your link. \n\nYour link is " + Item + " \n\nKind regards,\nName ", {
from: "Accounts#mydomain.com",
name: "Account"});
sheet.getRange(startRow + i, 8).setValue(EMAIL_SENT);
sheet.getRange(startRow + i, 9).setValue(now);
// Make sure the cell is updated right away in case the script is interrupted
SpreadsheetApp.flush();
}
else (emailSent === EMAIL_SENT); { // Prevents sending duplicates
}
}

Answer 1

You need to check for emailSent !== EMAIL_SENT before sending email:
//
var now = new Date();//mail semt date
var EMAIL_SENT = "EMAIL_SENT";// mail sent status
var approvalstatus = 'Approved';// Approved Status
function SecondaryApproval() {
var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 2; // First row of data to process
var numRows = 100; // Number of rows to process
var dataRange = sheet.getRange(startRow, 1, numRows, 16)
var data = dataRange.getValues();
for (var i = 0; i < data.length; ++i) {
var row = data[i];
var Ticket = row[0];
var RequesterEmail = row[2];
var Item = row[3];
var emailAddress = row[6]; // First column
var message = row[7]; // Second column
var emailSent = row[8]; // Third column
var date = row[9];
var yesNo = row[5];
if (yesNo === approvalstatus && emailSent !== EMAIL_SENT) {
var subject = "Secondary Approval ";
GmailApp.sendEmail(emailAddress, subject, "Dear " + + "RequesterEmail" + Ticket + ", \n\nThis is an email report of your link. \n\nYour link is " + Item + " \n\nKind regards,\nName ", {
from: "Accounts#mydomain.com",
name: "Account"});
sheet.getRange(startRow + i, 8).setValue(EMAIL_SENT);
sheet.getRange(startRow + i, 9).setValue(now);
// Make sure the cell is updated right away in case the script is interrupted
SpreadsheetApp.flush();
}
}