coffeescript-equivalents-in-es6

As the other commenters said, the arrow functions, which are very comfortable and very directly inspired from CoffeeScript. But more importantly, the whole idea of ES6 was inspired by CoffeeScript. This might seem weird if you were outside the loop at the time and don't realize how succesful it was, but the fact that ES6 got so many cool features was directly due to CoffeeScript's success. If ES6 wouldn't have those features, people would not have switched from CoffeeScript back to pure Javascript. And the success of Typescript shows that they still have to move quickly to keep pure Javascript relevant. Here's a list of comparisons between CoffeeScript and ES6/7: https://github.com/hemanth/coffeescript-equivalents-in-es6 Note that these are features that were not in ES5, then they were in CoffeeScript, and only then were they added to ES6