Cleaner way to send my email messages from Sheets - google-apps-script

Question

I currently have a working Google script that reads in the values on a dashboard in Google Sheets for swimming pool chemical monitoring. People will submit a form and if those numbers are greater than or less than a set number, it will send an email with a specific message.
This works fine but if there are multiple numbers that are off, I will receive multiple emails which gets annoying.
I am looking for one simple, clean output instead of multiple emails.
Here is part of my code (the rest is the same just different pools).
function sendEmails() {
var sheet = SpreadsheetApp.getActiveSheet();
//----vvvvvPool
var IDPpHReading = sheet.getRange('A6:A7').getValue();
var IDPpHTest = sheet.getRange('B6:B7').getValue();
var IDPORP = sheet.getRange('A9:A10').getValue();
var IDPSetPoint = sheet.getRange('B9:B10').getValue();
var IDPCL = sheet.getRange('A12:A13').getValue();
var IDP_Filter1_INF = sheet.getRange('A16:A17').getValue();
var IDP_Filter1_EFF = sheet.getRange('B16:B17').getValue();
var IDP_Filter2_INF = sheet.getRange('A20:A21').getValue();
var IDP_Filter2_EFF = sheet.getRange('B20:B21').getValue();
// insert email here
var emailAddress = "pseudoMcFakeEmail#Battlecruiser.com";
//-------------------- IDP pH
if (IDPpHReading > 7.8) {
var subject = "High pH Reading IDP";
var message = " An Aquatic Specialist recently logged a chemical reading that was too high for the Indoor Pool. Please check the situation asap.";
MailApp.sendEmail(emailAddress, subject, message);
}
else if (IDPpHReading < 7.2) {
var subject = "Low pH Reading IDP";
var message = " An Aquatics Specialist recently logged a chemical reading that was too low for the Indoor Pool. Please check the situation asap.";
MailApp.sendEmail(emailAddress, subject, message);
}
if (IDPpHTest > 7.8) {
var subject = "High pH Test IDP";
var message = " An Aquatics Specialist recently logged a chemical reading that was too high for the Indoor Pool. Please check the situation asap.";
MailApp.sendEmail(emailAddress, subject, message);
}
else if (IDPpHTest < 7.2) {
var subject = "Low pH Test IDP";
var message = " An Aquatics Specialist recently logged a chemical reading that was too low for the Indoor Pool. Please check the situation asap.";
MailApp.sendEmail(emailAddress, subject, message);
}
};
My go for this would be to make each message unique :
var message 1;
var message 2;
etc
and then have the email - MailApp.SendEmail(emailAddress,subject, message1+message2....);
But I feel like that is a sloppy way to do it.

Answer 1

I have had to do this a few times and what I usually do is use string concatenation to build the message and then send it:
var subject = "Abnormal pH Reading IDP";
var message = 'An Aquatics Specialist recently logged a chemical reading at the indoor pool and found:\n';
var needsCheck = false;
if (IDPpHReading > 7.8) {
var message = message + "\nA reading that was too high.";
var needsCheck = true;
}
else if (IDPpHReading < 7.2) {
var message = message + "\nA reading that was too low.";
var needsCheck = true;
}
if (IDPpHTest > 7.8) {
var message = message + "\nA test that was too high.";
var needsCheck = true;
}
else if (IDPpHTest < 7.2) {
var message = message + "\nA test that was too low.";
var needsCheck = true;
}
if (needsCheck){
var message = message + "\n\nPlease check the situation asap.";
MailApp.sendEmail(emailAddress, subject, message);
}