How To Download / Export Sheets In Spreadheet Via Google Apps Script

Question

The task is to automate the manual process accomplished by the menu option \"File | Download As | Plain Text\"

I want to be able to control the saved file name, whic

Answer 1

This app script returns a file for download instead of web page to display:

function doGet(){
    var outputDocument = DocumentApp.create('My custom csv file name'); 
    var content = getCsv();
    var textContent = ContentService.createTextOutput(content);
    textContent.setMimeType(ContentService.MimeType.CSV);
    textContent.downloadAsFile("4NocniMaraton.csv");
    return textContent;
}