Lisp: How to get all possible combinations of the elements from lists contained on a list?

Question

I need to write a function in Common-Lisp that takes a list of lists and returns a list containing all the possible combinations of the elements from the sublists.

S

Answer 1

wvxvw removed their answer that pointed to a function from Alexandria, but it does provide a very similarly named function that actually does what you want. Instead of alexandria:map-combinations, you need alexandria:map-product, e.g.

(apply #'alexandria:map-product #'list '((1 2) (1 2)))

evaluates to

((1 1) (1 2) (2 1) (2 2))