klandergren

;; 2.17
(define (last-pair list)
  (if (= (cdr list) ())
      (car list))        ;; I think paren error on this line.
  (cdr list))            ;; not calling last-pair recursively

;; 2.18 fails for me
(define (reverse list)
  (= (cdr list) ())                 ;; missing an if statement
  (= new-list (cons (car list) ())

klandergren

;; 2.17

;; Helpful link on equivalence
;; http://sicp.ai.mit.edu/Fall-2003/manuals/scheme-7.5.5/doc/scheme_4.html

(define (last-pair list)
  (if (null? (cdr list))
      (car list)                   ;; fixed paren error
      (last-pair (cdr list))))

klandergren

;; 2.17

;; Helpful link on equivalence
;; http://sicp.ai.mit.edu/Fall-2003/manuals/scheme-7.5.5/doc/scheme_4.html

(define (last-pair list)
  (if (null? (cdr list))
      (car list)                   ;; fixed paren error
      (last-pair (cdr list))))

klandergren

;; 2.2
;; SICP Exercise 2.2

;; takes x and y coordinates to create a point
(define (make-point x y)
  (cons x y))

(define (make-segment x1 y1 x2 y2)
  ;; needs implementation
)

klandergren

;; think on this:

;; contains-incomplete returns 0 if it doesn't find
;; the val and greater than 0 if it does
(define (contains-incomplete val list)
 (fold-left (lambda (a x) (YOUR CODE) 0 list))

;; testing
(contains-incomplete 0 '(1 2 3))   ;; => 0
(contains-incomplete 1 '(1 2 3))   ;; => 1

klandergren

(define test1 '(1 3 (5 7) 9))
(define test2 '((7)))
(define test3 '(1 (2 (3 (4 (5 (6 7)))))))

;; testing

(car test1)        ;; => 1
(car (cdr test1))  ;; => 3

;; write your code for test1, test2, test3 in

klandergren

<form>
  Name:  <input type="textbox" name="name" /> <br />
  Check box if you're alive:  <input type="checkbox" name="alive" /> <br />
  <input type="button" name="submit" value="we win click!" onClick="pulse(form)" />
</form>

<script type="text/javascript">
function pulse(data){

console.log(data);

klandergren

// working version
function swap(a_array, i, j) {
    var tmp = a_array[i];
    a_array[i] = a_array[j];
    a_array[j] = tmp;
}


function bubble_sort(an_array){
    var n = an_array.length;

klandergren

function max(a, b) {
    this.a = a;
    this.b = b;

    if (a > b) {
    return a;
  } else {
    return b;
  }
}