Calendar Events to Sheet is Duplicating - remove duplicates not working - google-apps-script

Question

See code below: It's set to update on calendar event.
But events are still duplicating onto the sheet.
Can you take a look and see where I went wrong?
get only new created events - is there a way to getevents by created date (now)?
}
var events = calendar.getEvents(start, end);
var eventDetails = [];
var eventarray = new Array();
for(var i = 0; i<events.length; i++){
eventDetails.push([events[i].getLocation(), events[i].getTitle(), events[i].getDescription(), events[i].getStartTime()]);
}
var startRow = sheet.getLastRow();
var startCol = 2;
for(var j = 0; j<eventDetails.length; j++){
var tempRange = sheet.getRange(startRow+j,startCol, 1, 4);
var eventArray = new Array(eventDetails[j]);
tempRange.setValues(eventArray);
}
//Here lies the problem code//
for(i in eventDetails){
var row = eventDetails[i];
var duplicate = false;
for(j in eventArray){
if(row.slice(0,2).join() == eventArray[j].slice(0,2).join()){
duplicate = true;
}
}
}
if(!duplicate){
eventArray.push(row);
{
return eventArray;
ss.sort(2, true);
}
}
}

Answer 1

Issue:
You have a sheet with data from a list Calendar events.
You want a script to retrieve and write any new events, ignoring the ones already in the sheet.
You identify an event through its location, title and description.
Solution:
If all this is correct, then you can do the following:
After retrieving the events from the calendar, use map() to retrieve the event details.
If there are any old events in the sheet, filter them out of your eventDetails array, using filter() and every() (the second parameter of slice() is exclusive so, if you want to compare the three first properties, it should be slice(0,3) instead of slice(0,2)).
If the filtered array of eventDetails is not empty (that is, there are new events in the Calendar), write those new events to your sheet.
Code sample:
function importCalendar(){
var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Sheet1'); //Target sheet for events
var calendarName = sheet.getRange('C2').getValue(); //name of calendar ex. calendar#gmailcom
var start = sheet.getRange('C3').getValue(); //to date
var end = sheet.getRange('C4').getValue(); //from date
var calendar = CalendarApp.getCalendarById(calendarName);
if(!calendar) calendar = CalendarApp.getCalendarsByName(calendarName)[0];
var events = calendar.getEvents(start, end);
var eventDetails = events.map(event => [event.getLocation(), event.getTitle(), event.getDescription(), event.getStartTime()]);
var lastRow = sheet.getLastRow();
var startCol = 2; // Column where the event list starts
var oldStartRow = 8; // Row where the event list starts
var numCols = 4; // Number of event fields
var numRows = lastRow - oldStartRow + 1;
if (numRows !== 0) { // If there are events in the sheet, filter the duplicates
var oldEvents = sheet.getRange(oldStartRow, startCol, lastRow - oldStartRow + 1, numCols).getValues();
// Filter out duplicates:
eventDetails = eventDetails.filter(eventRow => oldEvents.every(oldEvent => oldEvent.slice(0,3).join() != eventRow.slice(0,3).join()));
}
if (eventDetails.length != 0) { // Check if there is any new event coming from the Calendar
sheet.getRange(lastRow + 1, startCol, eventDetails.length, eventDetails[0].length).setValues(eventDetails);
}
}