Github user jbmusso commented on the issue:
https://github.com/apache/tinkerpop/pull/450
Ah, it looks like [nashorn supports let and const keywords on
8u40](http://fr.slideshare.net/akihironishikawa/nashorn-in-the-future-en) so we
could swap `var` for `let` and `const` unless we want to target earlier
versions of Java8. I don't think adding a transpiler such as Babeljs to the mix
is worth the trouble here since it's going to be a nightmare to maintain the
build pipeline. However, it *could* make sense for more recent versions of
Node. Node 7 would be happier with ES2015 code rather than ES5 ;) - see
http://node.green/. I don't think it's realistic so I'm just putting it here
for further reference, basically when Java9 is out (where [nashorn could fully
support
ES2015/6](http://fr.slideshare.net/akihironishikawa/nashorn-in-the-future-en)).
Note that there is [a proposal for adding async iterator to
JavaScript](https://github.com/tc39/proposal-async-iteration). It's currently
in stage 3 so this could make it to the EcmaScript specification. Using
`.next()` for async iteration might become a reality.
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