Apps Script Google Sheets Birthday Reminder Range in Array - arrays

Question

I'm trying to write an automatic birthday reminder for my team.
It's supposed to check if a persons birthday is today and if so, send a mail to everyone else in the team.
In Google Sheets, the four columns are: name, surname, e-mail and birthday. First row are headers.
This is what I got so far (mostly copied):
`
function main() {
// Load the sheet that contains the birthdays.
var sheet = SpreadsheetApp.getActive().getSheetByName("Geburtstage");
// Get the last row in the sheet that has data.
var numRows = sheet.getLastRow();
// Load data in the first two columns from the second row till the last row.
// Remember: The first row has column headers so we don’t want to load it.
var range = sheet.getRange(2, 1, numRows - 1, 4).getValues();
// Use a for loop to process each row of data
for(var index in range) {
// For each row, get the person’s name and their birthday
var row = range[index];
var name = row[0];
var birthday = row[3];
// Check if the person’s birthday is today
if(isBirthdayToday(birthday)) {
//If yes, send an email reminder
emailReminder(name);
}
}
}
// Check if a person’s birthday is today
function isBirthdayToday(birthday) {
var today = new Date();
if((today.getDate() === birthday.getDate()) &&
(today.getMonth() === birthday.getMonth())) {
return true;
} else {
return false;
}
}
// Function to send the email reminder
function emailReminder(name) {
var subject = "Geburtstagerinnerung: " + name;
var recipient = Session.getActiveUser().getEmail();
var body = name + " hat heute Geburtstag!";
MailApp.sendEmail(recipient, subject, body);
}
`
All that is missing is to replace the recipient by all e-mails in the third column, except for the person whos birthday it is.
My idea is, to save the range of the third column (e-mails) to an array, drop the e-mail whos birthday it is, and pass it to recipient as a comma separated string.
Afterwards reset the array in case two people have the same birthday.
My problem is, that I have no idea what I'm doing and all the solutions I found are overly complicated.

Answer 1

Try this:
function main() {
const dt = new Date();
const dtv = new Date(dt.getFullYear(),dt.getMonth(),dt.getDate()).valueOf();
const ss = SpreadsheetApp.getActive();
const sh = ss.getSheetByName("Sheet0");
const vs = sh.getRange(2, 1, sh.getLastRow() - 1, 4).getValues();
let recipients;
vs.forEach((R,i) => {
let d = new Date(R[3]);
let dv = new Date(d.getFullYear(),d.getMonth(),d.getDate()).valueOf();
if(dv == dtv) {
recipients = vs.filter((r,j) => j != i ).map( r => r[2]).flat().join(",")
GmailApp.sendEmail(recipients,`Todays ${R[0]} Birthday`,"");
}
});
}