CS 330 Lecture 31 – Hi, Scheme
April 20, 2012 by Chris Johnson. Filed under
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cs330, lectures, spring 2012.
Agenda
- Thinking functionally
- recursion over iteration
- chaining vs. sequence
- atoms, lists, and S-expressions
- Polish notation
- car, cdr, cons, cond
- our first functions
- arithmetic expressions
- logical expressions
- factorial
- lambda
- list functions
- length
- contains
- nth-element
- merge
- remove
- map
- filter
TODO
Program This
Choose one or both:
- Write contains, which takes two arguments: a list and an atom. Return true if the list contains the atom.
- Write nth-element, which returns the the nth-element (starting at 0) of the list.
Code
stuff.scm
(define calc-tax
(lambda (price) (* 1.055 price)))
(calc-tax 3.69)
;; ((lambda (price) (* 1.055 price)) 3.69)
(define !
(lambda (n)
(cond
((= n 0) 1)
(else (* n (! (- n 1)))))))
(define merge
(lambda (a b)
(cond
((null? a) b)
((null? b) a)
(...))))