Question

cons currently behaves like so:

(cons '(1 2) '(3))
;=> ((1 2) 3)

I would like to achieve:

(magic-cons '(1 2) '(3))
;=> (1 2 3)

I couldn’t find a resource for this yet this seems so simple I feel there should be a built in function.

Or I just don’t know the write words to describe this situation. Either way, please let me know. Thanks!

Edit:
Please don’t answer with “flatten” 😛 ie

(flatten (cons '(1 2) '(3)))

Answer 1

You have to use concat:

clojure.core/concat
([] [x] [x y] [x y & zs])
  Returns a lazy seq representing the concatenation of the elements in the supplied colls.

Sample use:

user> (concat '(1 2) '(3))
(1 2 3)