Primitive List-Manipulating Functions

> (define x '(a b c d))

> (car x) ; CAR returns 1st elt of list

A

> (cdr x) ; CDR returns all but 1st.

(B C D)

> x

(A B C D) ; X has not been changed.

> (cons 'a 'b)

(A . B) ; CONS combines two things.

> (cons 'a ())

(A) ; The result is often a list.

> (cons 'z x)

(Z A B C D)

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