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comparison man/lispref/variables.texi @ 1024:ccaf90c5a53a

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[xemacs-hg @ 2002-10-02 09:29:37 by stephent] 21.4 -> R21.5 stuff manual improvements <87k7l1p6su.fsf@tleepslib.sk.tsukuba.ac.jp> regexp tests <87fzvpp6mf.fsf@tleepslib.sk.tsukuba.ac.jp> add-to-list doc Ville Skyttä <87bs6dp6io.fsf@tleepslib.sk.tsukuba.ac.jp> Move filename associations Ville Skyttä <877kh1p6ee.fsf@tleepslib.sk.tsukuba.ac.jp> lookup-syntax-properties <87admil2e0.fsf_-_@tleepslib.sk.tsukuba.ac.jp> fix stale submatches <873crpp50v.fsf_-_@tleepslib.sk.tsukuba.ac.jp> info for developers <87y99hnqc4.fsf@tleepslib.sk.tsukuba.ac.jp>
author stephent
date Wed, 02 Oct 2002 09:31:40 +0000
parents c33ae14dd6d0
children 6780963faf78
comparison
equal deleted inserted replaced
1023:ce9bdd48654f 1024:ccaf90c5a53a
723 @end defun 723 @end defun
724 724
725 One other function for setting a variable is designed to add 725 One other function for setting a variable is designed to add
726 an element to a list if it is not already present in the list. 726 an element to a list if it is not already present in the list.
727 727
728 @defun add-to-list symbol element 728 @defun add-to-list symbol element &optional append
729 This function sets the variable @var{symbol} by consing @var{element} 729 This function sets the variable @var{symbol} by consing @var{element}
730 onto the old value, if @var{element} is not already a member of that 730 onto the old value, if @var{element} is not already a member of that
731 value. It returns the resulting list, whether updated or not. The 731 value. It returns the resulting list, whether updated or not. The
732 value of @var{symbol} had better be a list already before the call. 732 value of @var{symbol} had better be a list already before the call.
733
734 If the optional argument @var{append} is non-@code{nil}, @var{element}
735 is added at the end of the list.
733 736
734 The argument @var{symbol} is not implicitly quoted; @code{add-to-list} 737 The argument @var{symbol} is not implicitly quoted; @code{add-to-list}
735 is an ordinary function, like @code{set} and unlike @code{setq}. Quote 738 is an ordinary function, like @code{set} and unlike @code{setq}. Quote
736 the argument yourself if that is what you want. 739 the argument yourself if that is what you want.
737 740