Held: Monday, 8 September 2003
Summary: Today we consider two of Scheme's most important types of data: symbolic values and lists.
> 'a a > a reference to undefined identifier: a > (quote a) a
> (define a 12) > a 12 > 'a a
Take it literally; don't attempt to interpret or evaluate it.
(cons thing-for-the-front rest-of-the-list)
> (cons 'a null) (a) > (cons 'b (cons 'a null)) (b a)
> (list 'a 'b 'c) (a b c)
car: get the initial element of the list.
cdr: get all but the initial element of the list.
list-ref: get the ith element of the list.
Thursday, 28 August 2003 [Samuel A. Rebelsky]
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