Also on the subject of clojure's data structures, they are all immutable by default (with structural sharing so changes are efficient, not just defensive copys)

Also on the subject of clojure's data structures, they are all immutable by default (with structural sharing so changes are efficient, not just defensive copys). This greatly assists in writing functional, multi-threaded code. For original asker, see here for more details: https://clojure.org/reference/data_structures https://clojure.org/reference/data_structures