google sheets calulation latency and dependant function calls

Question

Here is a function that pupulates a column with a formula:

function fillAccount(lastRow) {

  var spreadsheet = SpreadsheetApp.getActive();
  spreadsheet.getRang         


        

Answer 1

First of all, your function needs a bit of cleanup (it can be done refined further, but that's a start):

function fillAccount(lastRow) {
  var spreadsheet = getSpread(); //custom method calling the Spreadsheet, change to your logic;

  var colB = spreadsheet.getRange('B1:B'+lastRow);
  var row1 = colB.getCell(1,1);
  var row2 = colB.getCell(2,1);      

  row1.setValue(' ');
  row2.setFormula('=ifna(vlookup(C2,RENAMED!$A$1:$A$7,1,false),B1)');
  row2.copyTo(colB.offset(1,0,lastRow-1), SpreadsheetApp.CopyPasteType.PASTE_FORMULA, false);

  SpreadsheetApp.flush(); //make sure changes are applied;      
}

Then, simply call the second function and make sure you access values to ensure calculation (if you have a pretty long latency (e.g. > 1s for each formula calc), some formulas might end up with #ERROR! value - if you want to account for that, add check ==='#ERROR!' that terminates second function upon encountering such a value and recursively restarts it):

/**
 * Caller function;
 */
function triggerFill() {

  //...your logic and lastRow initialization here;

  fillAccount(lastRow);
  copyAllData();
}

/**
 * Function accessing updated values;
 */
function copyAllData() {
  var spreadsheet = getSpread(); //custom method calling the Spreadsheet, change to your logic;
  var dataRange = spreadsheet.getDataRange(); //just an example that gets all data;
  var values = dataRange.getValues(); //just an example that gets all values;
  for(var i=0; i