14 June 2017

JDK9 is planning to incrementally support the ES6 features of JavaScript. In the current early-access builds (tested with 9-ea+170), major features like classes are not supported yet; but keywords like let/const, arrow functions and string-interpolation already work:

#!jjs --language=es6
"use strict";

let hello = (from, to) => print(`Hello from ${from} to ${to}`);

if ($EXEC('uname -n')) {
    let hostname = $OUT.trim();
    hello(hostname, 'daniel');

For details on what’s included by now, read JEP 292.