Node.js, ECMAScript 2015/2016/2017, and beyond
In 2015, the ECMAScript committee released a long-awaited major update of the JavaScript language. The update brought in many new features to JavaScript, such as Promises, arrow functions, and Class objects. The language update set the stage for improvements. since that should dramatically improve our ability to write clean, understandable JavaScript code.
The browser makers are adding those much-needed features, meaning the V8 engine is adding those features as well. These features are making their way into Node.js starting with version 4.x.
Note
To learn about the current status of ES-2015 in Node.js, visit https://nodejs.org/en/docs/es6/.
By default, only the ES-2015/2016/2017 features that V8 considers stable are enabled by Node.js. Further features can be enabled with command-line options. The almost-complete features are enabled with the --es_staging option. The website documentation gives more information.
The Node green website (http://node...
