Questions tagged [mutability]

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3
votes
1answer
130 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-...
8
votes
2answers
127 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 ...