diff options
author | Richard M. Stallman <rms@gnu.org> | 2001-08-12 21:15:14 +0000 |
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committer | Richard M. Stallman <rms@gnu.org> | 2001-08-12 21:15:14 +0000 |
commit | a9749dabdf94b72b99a3adf3f1bbe88c12fffc31 (patch) | |
tree | d8b585ffe60af485f7dbd6ed435a2cc5a6bf41cd /lispref/lists.texi | |
parent | fafee57973c1e467ee4233a9812e34c8187a0e71 (diff) |
Minor cleanups.
Diffstat (limited to 'lispref/lists.texi')
-rw-r--r-- | lispref/lists.texi | 49 |
1 files changed, 33 insertions, 16 deletions
diff --git a/lispref/lists.texi b/lispref/lists.texi index b0a3a1f6b8..5f16394ae1 100644 --- a/lispref/lists.texi +++ b/lispref/lists.texi @@ -384,7 +384,7 @@ If @var{n} is zero or negative, @code{nthcdr} returns all of @end defun @defun last list &optional n -This function reruns the last link of the given @var{list}. The +This function returns the last link of @var{list}. The @code{car} of this link is the list's last element. If @var{list} is null, @code{nil} is returned. If @var{n} is non-nil the @var{n}-th-to-last link is returned instead, or the whole @var{list} if @@ -496,6 +496,15 @@ any symbol can serve both purposes. This macro provides an alternative way to write @code{(setq @var{listname} (cons @var{newelt} @var{listname}))}. It is new in Emacs 21. + +@example +(setq l '(a b)) + @result{} (a b) +(push 'c l) + @result{} (c a b) +l + @result{} (c a b) +@end example @end defmac @defun list &rest objects @@ -520,9 +529,9 @@ are given, the empty list is returned. @end defun @defun make-list length object -This function creates a list of length @var{length}, in which all the -elements have the identical value @var{object}. Compare -@code{make-list} with @code{make-string} (@pxref{Creating Strings}). +This function creates a list of @var{length} elements, in which each +element is @var{object}. Compare @code{make-list} with +@code{make-string} (@pxref{Creating Strings}). @example @group @@ -533,6 +542,12 @@ elements have the identical value @var{object}. Compare (make-list 0 'pigs) @result{} nil @end group +@group +(setq l (make-list 3 '(a b)) + @result{} ((a b) (a b) (a b)) +(eq (car l) (cadr l)) + @result{} t +@end group @end example @end defun @@ -1064,19 +1079,19 @@ value. @example @group -(setq x '(1 2 3 4)) - @result{} (1 2 3 4) +(setq x '(a b c)) + @result{} (a b c) @end group @group x - @result{} (1 2 3 4) + @result{} (a b c) (nreverse x) - @result{} (4 3 2 1) + @result{} (c b a) @end group @group ;; @r{The cons cell that was first is now last.} x - @result{} (1) + @result{} (a) @end group @end example @@ -1379,9 +1394,9 @@ the value @code{cones}; the key @code{oak} is associated with @example @group -'((pine . cones) - (oak . acorns) - (maple . seeds)) +((pine . cones) + (oak . acorns) + (maple . seeds)) @end group @end example @@ -1397,10 +1412,10 @@ the alist element: Sometimes it is better to design an alist to store the associated value in the @sc{car} of the @sc{cdr} of the element. Here is an -example: +example of such an alist: @example -'((rose red) (lily white) (buttercup yellow)) +((rose red) (lily white) (buttercup yellow)) @end example @noindent @@ -1549,7 +1564,7 @@ becomes clearer if the association is written in dotted pair notation: @end smallexample @end defun -@defun assoc-default key alist test default +@defun assoc-default key alist &optional test default This function searches @var{alist} for a match for @var{key}. For each element of @var{alist}, it compares the element (if it is an atom) or the element's @sc{car} (if it is a cons) against @var{key}, by calling @@ -1622,7 +1637,9 @@ the associations of one copy without affecting the other: @defun assq-delete-all key alist @tindex assq-delete-all This function deletes from @var{alist} all the elements whose @sc{car} -is @code{eq} to @var{key}. It returns the modified alist. +is @code{eq} to @var{key}. It returns @var{alist}, modified +in this way. Note that it modifies the original list structure +of @var{alist}. @example (assq-delete-all 'foo |