Logging in Google Apps Script

I have some Google Apps Script code that archives emails. I can see if the code ran without errors in the execution log, but I would like to also see how many emails were archived on a run to know if it changed the state of my inbox.

We can use the execution log to do some simple logging.

function archiveInbox() {
    var threads = GmailApp.search('label:inbox from:(jobalerts-noreply@linkedin.com) older_than:4d');
    for (var i = 0; i < threads.length; i++) {
        console.log(
            'Moving thread to archive: "%s"',
            threads[i].getFirstMessageSubject()
        );
        threads[i].moveToArchive();
    }
}

In the snippet above, the console.log statement gets pushed directly to the execution log. This will leave a note whenever a thread gets archived with the subject of the thread.

To view the logs, check the execution log from the Executions sidebar menu.