List utilities

(cons 1 (cons 2 ())) -> (1 2)

cons produces a new cons cell (essentially a pair of two values). Cons cells (or pairs) form the basis of linked lists, and therefore all source code.

(car '(1 2 3 4)) -> 1

car returns the first item of a cons cell.

(cdr '(1 2 3 4)) -> (2 3 4)

cdr returns the second item of a cons cell.

(list 1 2 3 4) -> (1 2 3 4)

list is a function takes any number of parameters, and produces a list containing only those elements in the order passed to it.