Error in emacs elisp when binding a lambda to a key

Question

I am getting a "Wrong type argument: commandp, (lambda nil (forward-line 5))" here.

(global-set-key [?\M-n] '(lambda () (forward-line 5)))

What is the error? I'm fairly sure it's simple & I'm missing something obvious.

Answer 1

global-set-key expects an interactive command. '(lambda () (interactive) (forward-line 5)) ought to work.

By the way, C-h f commandp is a pretty good starting point for errors like that.

Answer 2

The correct form should be this -

(global-set-key (kbd "M-n") '(lambda () (interactive) (forward-line 5)))

The problem was that you forgot to put (interactive) (as brendan mentioned).

By the way, you will notice that I used the (kbd) function for specifying the key-binding. That function is immensely useful since you can put the key-bindings almost literally.

Answer 3

As a side note: when you quote the anonymous function like that it won't be compiled. I imagine it's no big deal in your case, though.