| fn | function that takes as many arguments as there are lists |
| lists | lists which elements are processed in parallel |
MAPCAN applies function FN to elements of lists with same index. Each application result is concatenated into resulting list. See MAPCAR.
(mapcan (lambda (x) (list (+ x 10) 'x)) '(1 2 3 4)) => (11 X 12 X 13 X 14 X)
(mapcan #'list '(a b c d)) => (A B C D)
(mapcan (lambda (x) (if (> x 0) (list x) nil)) '(-4 6 -23 1 0 12 )) => (6 1 12)