Determining the last row in a single column

Question

I have a sheet with data in cols A through H.

I need to determine the last row in column A that contains data (it\'s all conti

Answer 1

For very large spreadsheets, this solution is very fast:

function GoLastRow() {
  var spreadsheet = SpreadsheetApp.getActive();
  spreadsheet.getRange('A:AC').createFilter();
  var criteria = SpreadsheetApp.newFilterCriteria().whenCellNotEmpty().build();
  var rg = spreadsheet.getActiveSheet().getFilter().setColumnFilterCriteria(1, criteria).getRange();

  var row = rg.getNextDataCell (SpreadsheetApp.Direction.DOWN);  

  LastRow = row.getRow();

  spreadsheet.getActiveSheet().getFilter().remove();

  spreadsheet.getActiveSheet().getRange(LastRow+1, 1).activate();

};