Sweet.js is really cool, but it's not really a new development in JavaScript per se. It's a preprocessor. You can't actually use it in a JavaScript program any

Sweet.js is really cool, but it's not really a new development in JavaScript per se. It's a preprocessor. You can't actually use it in a JavaScript program any more than you can use CoffeeScript in a JavaScript program — instead, you have to write a Sweet.js program and have it create your JavaScript for you. It's a great addition to the JavaScript ecosystem, though.