how to use GmailApp.Sendemail when certain conditions are met? - google-apps-script

Question

I have 5 columns (C2:C, E2:E, F2:F, J2:J, L2:L) in a sheet that i'd like to use when certain conditions are met to send an email
if F2:G <= E2:E, send email with subject like "check out C2:C"
if E2:E >= L2:L AND J2:J <> "", send email with subject like "take a look at C2:C"
I did a bit of searching and found 2 different instances to check for a condition and to send email but not able to put the 2 together to make it work like the above. Below are 2 different scripts, one is commented out just to show what i was working with...
Here is what I have so far:
function Alert() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("Display");
var ERange = sheet.getRange("E2:E").getValues();
var FRange = sheet.getRange("F2:F").getValues();
var results = [];
for(var i=0;i>ERange.length;i++){
if(ERange[i]<=FRange[i]){
results.push("this line met conditions3 "+(i+2)); // +2 because the loop start at zero and first line is the second one (E2)
}
}
MailApp.sendEmail('xx#yy.com', 'subject', results.join("\n"));
};
//function AlertEmails() {
// var ss = SpreadsheetApp.getActiveSpreadsheet();
// ss.setActiveSheet(ss.getSheetByName("EmailDetails"));
// var sheet = SpreadsheetApp.getActiveSheet();
// var dataRange = sheet.getRange("A2:C3");
// var data = dataRange.getValues();
// for (i in data) {
// var rowData = data[i];
// var emailAddress = rowData[1];
// var recipient = rowData[0];
// var message1 = rowData[2];
// var message = 'Dear ' + recipient + ',\n\n' + message1;
// var subject = 'googleSheets test automated script!';
// GmailApp.sendEmail(emailAddress, subject, message);
// }
//}
thanks guys!!

Answer 1

I would write it like this:
function Alert() {
var ss=SpreadsheetApp.getActive();
var sheet=ss.getSheetByName("Display");
var Evalues=sheet.getRange(2,5,sheet.getLastRow()-1,1).getValues();
This range format is a little less error prone. With E2:E you often get nulls between the bottom of data and maxrows.
var Fvalues=sheet.getRange(2,6,sheet.getLastRow()-1,1).getValues();
var results=[];
In the following line you have i>Evalues.length which is not true so it
terminated immediately.
for(var i=0;i<Evalues.length;i++){
You and I both left out the column indices. I just added them into the line below:
if(Evalues[i][0]<=Fvalues[i][0]){
results.push("This line met conditions3 "+(i+2));
}
}
MailApp.sendEmail('xx#yy.com', 'subject',results.join("\n"));
}