[asynchrony]

As a lisp (Scheme and Clojure) user who nonetheless takes issue with this statement:

1. Modern (JS) runtimes have JITs that can generate code almost as fast as C++.

2. You can write purely functional code in JS.

3. JS has arguably less features than R5RS Scheme, which itself is hard to fit on half a page.

[sausagefeet]

What do you mean by point 2? Unless you don't plan on doing any I/O, you can't write purely functional code in JS. Not that you can in Lisp either...

[asynchrony]

I meant that there is nothing about JS that prohibits writing pure functions and reaping all the associated benefits (formal reasoning, etc.)