title: ES6 on JavaScriptCore and React Native
body: <p>I'm trying to figure out what parts of ES6 are supported on React Native. I'm aware of the Babel transformations that are listed <a href="https://facebook.github.io/react-native/docs/javascript-environment.html" rel="noreferrer">here</a>, but I'm having a hard time figuring out what JavaScriptCore supports on its own <em>without</em> any transpiling. Like will JavaScriptCore support different things on different platforms and devices? Is it different on iOS 8 vs iOS9?</p>
  
  <p>For instance I wrote some code that uses generator functions and ES6 collection types, and those are not part of what's listed in the Babel transformations, and it works fine in React Native on the devices where I tested. But how do I know whether it will work for all devices I'm targeting?</p>