srsandy

function myFunction() {
 // var activeSpreadsheet = SpreadsheetApp.getActiveSpreadsheet();
//  var activeSheet = activeSpreadsheet.getActiveSheet();
  var ss = SpreadsheetApp.getActive();
  var allsheets = ss.getSheets();
  for(var s in allsheets){
    var targetSheet = allsheets[s];
    SpreadsheetApp.setActiveSheet(targetSheet);
     var lrow = targetSheet.getLastRow();
    var lcol = targetSheet.getLastColumn();

srsandy

// map
Array.prototype.myMap = function (cb) {
  const results = [];
  for (let i = 0; i < this.length; i++) {
    results[i] = cb(this[i], i, this);
  }
  return results;
};

// filter