Google Sheets commonly used functions

googlesheets.gs

/**
 * Insert current date (today) into current cell
 */

function InsertToday() {
  var currentDate = Utilities.formatDate(new Date(), 'Asia/Ho_Chi_Minh', 'dd/MM/YYYY');
  var spreadsheet = SpreadsheetApp.getActive();
  spreadsheet.getCurrentCell().setValue(currentDate);
};

/**
 * Delete columns and rows
 */
function DeleteColumnsAndRows() {
  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = spreadsheet.getSheetByName("SHEET-NAME-HERE");
  //  sheet.getRange(1, 2, sheet.getMaxRows(), sheet.getMaxRows()).activate();

  // Delete column B to max
  if (sheet.getMaxColumns() > 1) {
    sheet.deleteColumns(2, sheet.getMaxColumns()-1);
  }
  // Delete row 2 to max
  if (sheet.getMaxRows() > 1) {
    sheet.deleteRows(2, sheet.getMaxRows()-1);
  }
};

// Get value from "Price" sheet, 'N2' cell
var cellValue = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Price").getRange('N2').getValue();
// Logger.log(cellValue);

/**
 * Duplicate current row [insert above]
 */
function CopyRowInsertAbove() {
  var spreadsheet = SpreadsheetApp.getActive();
  var sheet = spreadsheet.getActiveSheet();
  sheet.insertRowsBefore(spreadsheet.getActiveRange().getRow(), 1);
  spreadsheet.getActiveRange().offset(0, 1 - spreadsheet.getCurrentCell().getColumn(), 1, spreadsheet.getActiveRange().getNumColumns()).activate()
  sheet.getRange(spreadsheet.getCurrentCell().getRow() + 1, 1, 1, sheet.getMaxColumns()).copyTo(spreadsheet.getActiveRange(), SpreadsheetApp.CopyPasteType.PASTE_NORMAL, false);
};

Add function CopyRowInsertAbove()