Just wanted to say thank you for CoffeeScript. Despite its somewhat ambiguous syntax it really was a better version of JavaScript, and it would be fair to say it really mainstreamed the idea of JS as a target language. Many of the ideas in CS made it all the way to ES6. Many other ideas didn't make it to ES6 because CS fleshed out issues that quite possibly would have been missed otherwise.
It was a huge net positive for web development. 2009-2011 were really heady times - a whole programming community emerged from a deep, dark cave with new tools and a new optimism for the web.