Is it possible to create circular references in Clojure?

Question

Ignoring native interop and transients, is it possible to create any data structures in Clojure that contain direct circular references ?

It would seem that immutable da

Answer 1

You can create a circular reference very easily by putting some form of reference inside a data structure, then updating the reference to point back to the overall structure.

A trivial example:

(def a [(atom nil)])

(reset! (first a) a)

This will create a list with one element, which is an atom that points back at the list.