In elisp, how do I put a function in a variable?

Question

I want to allow the user to choose their own command in the \"customize\" emacs backend (and generally be able to store an executable form name in a variable) but this does

Answer 1

To run a function stored in a variable you can use funcall

(defun dumb-f ()
  (message "I'm a function"))

(defvar my-function 'dumb-f)

(funcall my-function)
==> "I'm a function"