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Re: Wanted: Adding list-elements into an existing list


From: Allan Gottlieb
Subject: Re: Wanted: Adding list-elements into an existing list
Date: Thu, 16 Oct 2008 12:02:13 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux)

At Thu, 16 Oct 2008 08:43:48 -0700 Drew Adams <address@hidden> wrote:

>> (append) does not modify its first argument which is what I want.
>> I can solve it through (setq x (append x y))
>
> Depends what you want. You mentioned `add-to-list', which adds an element only
> if it is not already there. Neither `append' nor `nconc' does that for 
> combining
> lists.
>
> Sounds more like you want something like set intersection: see functions
> `intersection' or `nintersection' in library `cl-seq.el'.

Sounds more like set union to me.
allan




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