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There is a sequel to that book https://pragprog.com/book/7lang/seven-more-languages-in-seve... covering Lua, Factor, Elm, Elixir, Julia, miniKanren, and Idris.

There was a great interview with Bruxe Tate on the "Mostly Erlang" podcast some time last year. He discusses the decision process behind the languages that were included in the original "Seven Languages" book. From what I gathered, the reason Io was included was because Javascript is simply too complicated and multi-paradigm. The syntax and reasoning behind Io is extremely simply and illustrates prototypal principles beautifully.

It's never occurred to me to use Io for anything, but it's a wonderful mind expander.

Lua and IO are easily the two best ways to learn Javascript.

Once you know one, or both of them, you can see what's going on so much more clearly.

> Lua and IO are easily the two best ways to learn Javascript.

I think REBOL is a better way to learn JavaScript.

That's a great book. I credit it with getting me into functional programming.