Google Scripts for Gmail to archive inbox emails and delete old emails

code.gs

function archiveInbox() {
  var batchSize = 100; // Process up to 100 threads at once
  // Every thread in your Inbox that is older than two days.
  var threads = GmailApp.search('in:inbox older_than:5d');
  for (var i = 0; i < threads.length; i+=batchSize) {
    GmailApp.moveThreadsToArchive(threads.slice(i, i+batchSize));
  }
}

function cleanUp() {
  var batchSize = 100; // Process up to 100 threads at once
  var threads = GmailApp.search('older_than:1y');
  for (var i = 0; i < threads.length; i+=batchSize) {
    GmailApp.moveThreadsToTrash(threads.slice(i, i+batchSize));
  }
}