On: How necessary are var, let, and const?

[greghendershott]

> That said, can somebody implement hygienic macros in JavaScript.

Although I haven't used it hands-on, http://sweetjs.org/ looks impressive.

For example recently sweet.js apparently implemented some cutting-edge Racket macro developments before Racket officially did. :) https://github.com/mozilla/sweet.js/pull/461