[removed] The Good Parts Names/Strings railroad diagrams confusing

Question

I started reading JavaScript: The Good Parts book and became confused at first pages (7 and 9 if be exact) by the railroad diagrams.

There are diagrams for the name

Answer 1

The language described in the book "The Good Parts" is not JavaScript but a subset of it - you can call it "Crockford's JavaScript". Crockford introduces new syntax restrictions. One of those restrictions is that names cannot start with $ or _.