An alternate implementation of Howard Abrams' `org-get-headings'.

org-get-headings-alternate.el

;; An alternate implementation of Howard Abrams' `org-get-headings'.
;;
;; https://howardism.org/Technical/Emacs/tiddly-wiki-in-org.html
;;
;; I have not run any performance comparisons.  The main difference being that
;; this implementation does not require defining the `unpropertize' function.
(defun org-get-headings ()
  "Return a list of an org document's headings."
  (org-element-map
      (org-element-parse-buffer 'headline nil t)
      'headline
    (lambda (headline) (org-element-property :title headline))))