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


From: Drew Adams
Subject: RE: Wanted: Adding list-elements into an existing list
Date: Thu, 16 Oct 2008 08:43:48 -0700

> (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'.





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