JAVASCRIPT

Google App Script getSheetByName

var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Expenses");

Google App Script getSheetByName

var sheet = SpreadsheetApp.getActive().getSheetByName('Local')

Google Apps Script getSheetByName

// The code below logs the index of a sheet named "Expenses"
const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Expenses")
if (sheet != null) {
  Logger.log(sheet.getIndex())
}