If you have been coding Google Apps Script the update of JavaScript to ES6 has some new features. Such as use let instead of var (you can still use var). Let's go over some coding that uses updated JavaScript. https://www.labnol.org/es6-google-apps-script-v8-200206 https://www.w3schools.com/js/js_es6.asp http://es6-features.org/#Constants
