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ES6/2015 was the most significant update to the language since its birth. The specification took seven years to complete, but browsers and runtimes are finally starting to support arrow functions,
const, proxies and more delights. The ES6 compatibility table is turning a glorious shade of green.
Perhaps it's a little early to fully switch to ES6 if you're supporting older browsers. By older, I mean anything released more than a year ago. You can use an ES6-to-ES5 compiler such as Babel, but development is complicated enough without introducing an additional build step.
ES7/2016 is more evolution than revolution. One exciting new feature is async, which allows asynchronous code to be written in a synchronous manner without the syntactical complexities of callbacks or Promises (which continue to confuse me).
Best of all: any website or application can be transformed into a PWA within a few hours. The steps:
It's early days, and examples are rare, but PWAs offer an amazing opportunity to “mobilify” your web applications. Admittedly, there's no guarantee Apple will implement the technology, but it shouldn't matter: your app will still work in Safari, it just won't benefit from offline execution. I have a feeling Apple will be encouraged to support PWAs once the web experiences becomes noticeably superior on Android.
For more information, see Dev.Opera's Progressive Web Apps: The definitive collection of resources and Google's PWA Guides.