将两个onEdit与if函数合并？

我有在网上收集的Google表格脚本，并在此处获得了一些帮助。不，我有2个onEdit冲突。我通过为创建脚本Trigger来克服这一问题onEdit2。它有效，但我认为这不是最佳解决方案。您能否将onEditif函数合并为两个？

//Dependent Dropdown list
function onEdit(e){ // Function that runs when we edit a value in the table.
  masterSelector(master1,master2,master3,master4);
  var activeCell = e.range; // It returns the coordinate of the cell that we just edited.
  var val = activeCell.getValue(); // Returns the value entered in the column we just edited.
  var r = activeCell.getRow(); // returns the row number of the cell we edit.
  var c = activeCell.getColumn(); // returns the column number of the cell we edit.

  var wsName = activeCell.getSheet().getName();
  if (wsName === masterWsName && c === firstLevelColumn && r > masterNumberOfHeaderRows) { // the if delimits the section sensitive to modification and action of the onEdit.
    applyFirstLevelValidation(val,r);
  } else if (wsName === masterWsName && c === secondLevelColumn && r > masterNumberOfHeaderRows){
      applySecondLevelValidation(val,r);
    }
} // end of onEdit

// addRow by checkboxes 
function onEdit2(e) {
    masterSelector(master1,master2,master3,master4);
  //IF the cell that was edited was in column 4 = D and therefore a checkbox AND if the cell edited was checked (not unchecked):
  if (e.range.columnStart === 4 && e.range.getValue() === true) {
    var sheet = SpreadsheetApp.getActiveSheet(),
        row = sheet.getActiveCell()
        .getRow(),
        //(active row, from column, numRows, numColumns)
        rangeToCopy = sheet.getRange(row, 1, 1, 30);
    sheet.insertRowAfter(row);
    rangeToCopy.copyTo(sheet.getRange(row + 1, 1));
    //Reset checked boxes in column 4
    sheet.getRange(row,4,2,1).setValue(false);
  }
}

如果需要，整个脚本在这里。