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I'm trying to make a trivial function that simply transposes chars backwards.

This is what I got so far:

(defun jd:backward-transpose-chars ()
  (interactive)
  (transpose-chars -1))

(define-key global-map (kbd "<C-y>") '(transpose-chars))

(define-key global-map (kbd "<C-S-y>") '(jd:backward-transpose-chars))

But it gives me the error:

Debugger entered--Lisp error: (wrong-type-argument commandp (jd:backward-transpose-chars))

2

You have extra parenthesis, the correct synatx is:

(define-key global-map (kbd "<C-y>") #'transpose-chars)
(define-key global-map (kbd "<C-S-y>") #'jd:backward-transpose-chars)

By the way, I don't think I'd bother with keybindings: transpose-chars is bound by default to C-t, and to transpose backwards you can do C-- C-t (that's control minus, control t).

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