The 'caaaar' ... 'cadddr' functions go through the list expression and
perform a sequence of car or cdr
operations.
error: bad argument
The 'cadddr' function returns the same result as the fourth function.
(setq mylist '((((111A 111B) (112A 112B) (113A 113B)) ; 1st set
((121A 121B) (122A 122B) (123A 123B))
((131A 131B) (132A 132B) (133A 133B))
((141A 141B) (142A 142B) (143A 143B)))
(((211A 211B) (212A 212B) (213A 213B)) ; 2nd set
((221A 221B) (222A 222B) (223A 223B))
((231A 231B) (232A 232B) (233A 233B))
((241A 241B) (242A 242B) (243A 243B)))
(((311A 311B) (312A 312B) (313A 313B)) ; 3rd set
((321A 321B) (322A 322B) (323A 323B))
((331A 331B) (332A 332B) (333A 333B))
((341A 341B) (342A 342B) (343A 343B)))
(((411A 411B) (412A 412B) (413A 413B)) ; 4th set
((421A 421B) (422A 422B) (423A 423B))
((431A 431B) (432A 432B) (433A 433B))
((441A 441B) (442A 442B) (443A 443B)))
(((511A 511B) (512A 512B) (513A 513B)) ; 5th set
((521A 521B) (522A 522B) (523A 523B))
((531A 531B) (532A 532B) (533A 533B))
((541A 541B) (542A 542B) (543A 543B)))))
(caaaar mylist) => 111A
(caaadr mylist) => (211A 211B)
(caadar mylist) => (121A 121B)
(caaddr mylist) => ((311A 311B) (312A 312B) (313A 313B))
(cadaar mylist) => (112A 112B)
(cadadr mylist) => ((221A 221B) (222A 222B) (223A 223B))
(caddar mylist) => ((131A 131B) (132A 132B) (133A 133B))
(cadddr mylist) => (((411A 411B) (412A 412B) (413A 413B))
((421A 421B) (422A 422B) (423A 423B))
((431A 431B) (432A 432B) (433A 433B))
((441A 441B) (442A 442B) (443A 443B)))
Note: The '
See also: