Questions tagged [mutability]

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2
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1answer
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Run an external shell command to mutate text

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 ...
3
votes
1answer
147 views

Why is this function not pure

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-...
9
votes
2answers
145 views

Proper reinitialization of a list? What is happening under the hood?

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 ...