The implementation includes releases for Windows, OSX (ppc), OSX (Intel), and Raw Source; written in the functional language, Standard ML, specifically using the Standard ML of New Jersey compiler.
If you haven’t been following the progress being made on the ECMAScript 4 language, now is a fantastic time to get on board
. I’d recommend reading through the language documentation
, subscribing to the mailing list
, and following the implementation roadmap
All of this should get you ready to play around with the reference implementation. Should you spot a bug, be sure to submit it to the bug tracker.