Clojure's stdlib is unintuitive, and `into` is the poster child.
It's easy to find what's available in Ruby: https://ruby-doc.org/core-2.5.3/Enumerable.html
Good luck with Clojure: https://clojure.github.io/clojure/clojure.core-api.html
It's easy to find what's available in Ruby: https://ruby-doc.org/core-2.5.3/Enumerable.html
Good luck with Clojure: https://clojure.github.io/clojure/clojure.core-api.html