How to know if a sheet was already created?

[Plácido Antônio Langer Reinert]

I'm trying to create a sheet who will works like a Database for a couple of data getted of the Gmail (My sidebar will works just on Gmail).

But before i create a new sheet for that, i have to look if the sheet already exist. If exist i want to save on the sheet existent.

How can I do that?

[Alan Wells]

You can search by mime type and file title

https://developers.google.com/apps-script/reference/drive/drive-app?hl=en

var title = "Enter file name here";

var files = DriveApp.searchFiles('mimeType contains "spreadsheet" and title contains "' + title + '"');

while (files.hasNext()) {
  var file = files.next();
  Logger.log(file.getName());
}