Github user jbmusso commented on the issue:
https://github.com/apache/tinkerpop/pull/450
@jorgebay I'd be happy to help with the work on this. I recently [added
partial JavaScript-GLV support to
gremlin-javascript](https://github.com/jbmusso/gremlin-javascript/tree/3bdb154f41c08d5adfc65e83250eee6d57a5cab5#experimental-javascript-gremlin-language-variant).
The library generates Groovy strings using
[zer](https://github.com/jbmusso/zer) which is now stable/tested enough that I
decided to add it as a dependency to the client. I'll soon tinker with gremlin
bytecode support in zer and I think support for lambdas is easy with
`Function.prototype.toString()` (ref:
[mdn](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/toString)).
We could maybe add Babel dependency with nashorn/ES5 presets, then
parse/transpile lambdas at runtime so people can use ES2015/2016+ lambdas in
their Node.js/browsers environments (though transpilation performance could be
an issue, but client-side caching/memoization could certainly help).
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