Google Apps Script - Send Email based on value in columns - google-apps-script

Question

I am new with Google App Scripts and have a spreadsheet with 2 columns: https://docs.google.com/spreadsheets/d/1J3IR3y7VemlrKNsJ8u0gzaUAZy6wBb7qncPfKkab4l4/edit#gid=0
The scripts I'm using:
function sendEmail() {
const ss = SpreadsheetApp.getActive();
const sh = ss.getSheetByName('Sheet1'); // change Sheet1 to the name of your sheet
const data = sh.getRange('A2:B'+sh.getLastRow()).getValues();
data.forEach(r=>{
let salesValue = r[1];
if (salesValue = 0){
let name = r[0];
let message = 'There are no sales for ' + name;
let subject = 'No SALES.'
MailApp.sendEmail('myemail#email.com', subject, message);
}
});
}
This works but sends me one email per each business name. So, based on the data in the sheet, I will get 2 emails.
I would like to send one email only to group of emails on a daily basis when the sales column (B) equals ZERO. Assume that the sheet is updated daily and I want to set a trigger to run the script daily.

Answer 1

Your email send is in the forEach loop so every row that is zero (change the if comparison to ==) it is sending the email. Bring that to the bottom and you'll just get one email. This might get you closer to what you're looking for:
function sendEmail() {
const ss = SpreadsheetApp.getActive();
const sh = ss.getSheetByName('Sheet1'); // change Sheet1 to the name of your sheet
const data = sh.getRange('A2:B'+sh.getLastRow()).getValues();
let zeroSales = []
data.forEach(r=>{
let salesValue = r[1];
if (salesValue == 0){
let name = r[0];
zeroSales.push(name)
}
});
if (zeroSales.length > 0) {
let subject = 'No SALES.'
let message = 'There are no sales for ' + zeroSales.join(', ')
MailApp.sendEmail('myemail#email.com', subject, message);
}
}