Re: Easy to add with push but not to the end of a list

[Michael Heerdegen]

Emanuel Berg <incal@dataswamp.org> writes:

> Okay, this then?
>
> ;;; -*- lexical-binding: t -*-
> ;;
> ;; this file:
> ;;   https://dataswamp.org/~incal/emacs-init/list.el
>
> (defmacro push-last (elem lst)
>   "Push ELEM to be the last element of LST.
> Beware that this is O(n) while `push' is O(1)."
>   `(if (and (symbolp ,lst)
>             (not (symbol-value ,lst)) )
>        (setq ,lst (list ,elem))
>      (nconc ,lst (list ,elem)) ))

Better - this fixes one problem.

Ok, now Stefan has told the whole story I wanted you to find out
yourself.

Anyway, my next question would have been what kinds of expressions LST
you want to support.


Michael.