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Asked: 2026-05-26T05:12:43+00:00

I started reading JavaScript: The Good Parts book and became confused at first pages

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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 and the string literal. (you can see the diagrams here)

As I know names in JavaScript can start with letters as well as with underscore or even ‘$’ symbol. Following by the book’s diagram it can starts only from letters.

For the string literal, imagine that you want to represent string like that: “\\”.
Following by the diagram it’s not possible(seems like after the “escaped character” the “any unicode character except ” and \ and contol” is required.

Are those an errors in the book? Or I miss something?

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1 Answer

  1. Editorial Team

    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 _.

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