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Programming in Emacs Lisp

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
7.2.1 Find the Length of a List: length		How to find the length of a list.