Toggle between relative and absolute line numbers: Lisp Syntax

Question

I need to define a function that toggles between value of display-line-numbers but can't figure out what's the correct lisp syntax to do so. Here's what I want to do:

• Check if value of display-line-numbers set to t (absolute line numbers), change it to relative
• Else (it will be set to relative) change it to absolute (t).

Here's what I tried which is full of errors. Not having a very good hand at lisp

(defun cc/toggle-line-numbering ()
  "Toggle line numbering between absolute and relative."
  (interactive)
  (if (= (describe-variable display-line-numbers) "relative")
      (setq display-line-numbers t)
    (setq display-line-numbers 'relative)))

Answer 1

describe-variable retrieves the documentation of a variable, it doesn't do anything with the value of the variable. You just want to test to see if the value of the variable is eq to something.

(defun cc/toggle-line-numbering ()
  "Toggle line numbering between absolute and relative."
  (interactive)
  (if (eq display-line-numbers 'relative)
      (setq display-line-numbers t)
    (setq display-line-numbers 'relative)))