Is it possible to use native spreadsheet functions such as sum() or today() in google apps script, when writing code for google Spreadsheet? If so, how do I do it?
Google Apps Script is JavaScript, spreadsheets functions are not available and using a workaround like setFormula followed by getValue is not only cumbersome but really slow and inefficient. You will be better inspired to use JavaScript and Google services to manipulate data taken from a spreadsheet and write the data back in one single setValues().