14.2.26 append [Function]

append &rest lists ⇒ result

Arguments and Values::

list—each must be a proper list except the last, which may be any object.

result—an object. This will be a list unless the last list was not a list and all preceding lists were null.

Description::

append returns a new list that is the concatenation of the copies. lists are left unchanged; the list structure of each of lists except the last is copied. The last argument is not copied; it becomes the cdr of the final dotted pair of the concatenation of the preceding lists, or is returned directly if there are no preceding non-empty lists.

Examples::

 (append '(a b c) '(d e f) '() '(g)) ⇒  (A B C D E F G)
 (append '(a b c) 'd) ⇒  (A B C . D)
 (setq lst '(a b c)) ⇒  (A B C)
 (append lst '(d)) ⇒  (A B C D)
 lst ⇒  (A B C)
 (append) ⇒  NIL
 (append 'a) ⇒  A

See Also::

nconc , concatenate