loop count number of consecutive cell containing specific word - loops

Question

I'm quite a beginner in JavaScript (well google app script) but now I can manage my work without it. My goal is to send an email to someone when the number of cell containing the word "alert" is equal to 3. I think that the structure of my program might be correct however the syntax may be wrong.
Let me show you what does my program look like for now (I want it to begin on row number 24 and on the 34th column of my sheet):
function onEdit(e) {
let sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
//EVENT VARIABLES
let range = e.range;
let row = e.range.getRow();
let col = e.range.getColumn();
let cellValue = sheet.getActiveCell().getValue();
let lastRow = sheet.getLastRow;
let projectName = sheet.getRange(row,1).getValue();
let user = Session.getActiveUser().getEmail();
let cellLocation = sheet.getActiveCell().getA1Notation();
let countAlerte = 0;
let url = "https://docs.google.com/spreadsheets/d/blablabla"
for (i=24;i<=lastRow;i++){
if ((col == 34 && cellValue == "alerte")){
countAlerte = 1;
}
else {
countAlerte = 0;
}
if (countAlerte == 3){
MailApp.sendEmail(
'surname.name#xxx.com',
user + projectName + ' alerte mol 1 ',
url + '&range=' + cellLocation
);
};
}
Is my syntax and variable definition correct?
Is there something wrong with my loop?

Answer 1

You should add 1 instead of assignment:
{
countAlerte = countAlerte + 1; /// or just countAlerte += 1;
}
else {
countAlerte = 0;
}
That is regarding the counting.
Another thing is how do you want to catch onEdit(e). It would be better to get values in the column 34
var valuesInColumn = sheet.getRange(24, 34, lastRow, 1).getValues();
and loop through all values in the valuesInColumn array
for example:
if (col == 34){
var valuesInColumn = sheet.getRange(24, 34, lastRow, 1).getValues();
valuesInColumn.forEach(function(item){
if (item == "alerte"){
countAlerte = countAlerte + 1;
if (countAlerte == 3){
MailApp.sendEmail(
'surname.name#xxx.com',
user + projectName + ' alerte mol 1 ',
url + '&range=' + cellLocation
);
countAlerte = 0;
}
}
else{
countAlerte = 0;
}
});
}