Re: inverse of add-to-list: remove-from-list

[Stefan Monnier]

> I might be missing something, but where would the harm be in using
>> (add-hook 'org-export-filter-src-block-functions 'my-html-filter-src-blocks)
> even if it is not a hook?

I think none, but it would be harmful to do:

    (add-hook 'org-export-filter-src-block-functions
              #'my-html-filter-src-blocks
              nil t)

> So basically the answer would be, instead of looking for an opposite
> to add-to-list, use cl-pushnew which has a natural opposite in
> cl-remove. Is that so?

`cl-remove` is not the opposite of `cl-pushnew`, because

    (cl-pushnew V X :test F)
    (cl-remove  V X :test F)

will usually result in X being different from what it started (because
`cl-remove` does not modify its argument X).


        Stefan