Node:cons, Next:nthcdr, Previous:car & cdr, Up:car cdr & cons

7.2 cons

The cons function constructs lists; it is the inverse of car and cdr. For example, cons can be used to make a four element list from the three element list, (fir oak maple):

(cons 'pine '(fir oak maple))

After evaluating this list, you will see

(pine fir oak maple)

appear in the echo area. cons puts a new element at the beginning of a list; it attaches or pushes elements onto the list.

• Build a list:
• length: How to find the length of a list.