Questions tagged [mutability]

I'm teaching myself some more elisp and have encountered the following problem: If I want to reset a list variable it won't get updated after the first evaluation. Here is some example code: (defun initilize () (setq example '(3))) (defun modify…

GNU Emacs Lisp Reference Manual, section 2.9 Mutability: A mutable object stops being mutable if it is part of an expression that is evaluated. For example: (let* ((x (list 0.5)) (y (eval (list 'quote x)))) (setcar x 1.5) ;; The program…

I just spent a significant amount of time debugging an issue that boils down to the following: (defun my-new-alist () `((x . nil))) (setq a (my-new-alist)) (setq b (my-new-alist)) (push 1 (alist-get 'x a)) b ;; ((x . 1)) I expected a and b to…

I would like to run par or fmt to format my .md file. In vim this would be %!fmt (for the whole buffer) or 13,16!fmt (for line 13 - line 16). What's the "emacs way" to achieve something like this PS: I am aware of evil-mode(If I wanted vi…