Comment by MathMonkeyMan

Guile has [multi-methods][1] and [fast hash maps][2], but not yet [dynamic vectors][3].

Clojure's data structures are easier to use, though.

[1]: https://www.gnu.org/software/guile/manual/html_node/Methods-...

[2]: https://www.gnu.org/software/guile/manual/html_node/Hash-Tab...

[3]: https://lists.gnu.org/archive/html/guile-devel/2022-01/msg00...