Using ES2015 with Asset Pipeline on Ruby on RailsJavaScript is all new. Until recently, we had no new features. The last significant update was back in 2009, with ES5‘s release. And you couldn’t use all features due to browser incompatibility. To increase the compatibility level, we had to use things like es5-shim, which conditionally checked if a feature was available, adding a polyfill if the browser didn’t implement it. And then the first pre
