compare two arrays and delete data that is not in other array - arrays

Question

I am new to the Apps script and trying to compare two email lists,
emails from google contacts
and emails from a google sheet (column B),
I want to delete email/s from Google Contacts that are not listed in the google sheet.
I got partial code from here and trying to modify it for my use, however, I stuck in the last part to detect the email that is not in the google sheet and then delete it from google contact.
Here is what I could put together, Extracting emails from Google contacts and Google sheet works fine.
running the following code does not work, but I don't get any error either.
Edited: I am not sure the first part of the code that extracts data from google contacts is in one array, because each email is printed like this when used console.log: [email1#email.com]
Appreciate your help to make it work.
function deleteContacts() {
var contactEmails = ContactsApp.getContacts().map(function(contact) {
return contact.getEmailAddresses();
//console.log("Google Emails:" + contactEmails);
var sheet = SpreadsheetApp.getActive().getSheetByName("sheet2");
var ColEmails = sheet.getRange('B2:B').getValues().map(function(value) {
return value[0];
}).filter(function(val) {
return val != "";
})
//console.log("Sheet Emails:" + ColEmails);
for (var i = 0; i < contactEmails.length; i++) {
if (ColEmails.indexOf(contactEmails[i]) == -1) {
var contact = ContactsApp.getContactsByEmailAddress(contactEmails[i]);
ContactsApp.deleteContact(contact);
}
}
});
}

Answer 1

Try:
function deleteContacts() {
const ss=SpreadsheetApp.getActive();
const sh = ss.getSheetByName("sheet2");
const rg = sh.getRange(2,2,sh.getLastRow()-1,1);
const vs = rg.getValues().flat();
const emails = ContactsApp.getContacts().map(function (contact) {return contact.getEmailAddresses();}).flat();
emails.forEach(e=>{
if(!~vs.indexOf(e)) {
ContactsApp.getContact(e).deleteContact()
}
});
}