Created
April 4, 2020 23:15
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list-eq?
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(define atom? | |
(lambda (x) | |
(and (not (pair? x)) (not (null? x))))) | |
(define generic-eq? | |
(lambda (item1 item2) | |
(cond ((and (number? item1) (number? item2)) (= item1 item2)) | |
((and (atom? item1) (atom? item2)) (eq? item1 item2)) | |
((and (list? item1) (list? item2)) (list-eq? item1 item2)) | |
(else #f) | |
))) | |
(generic-eq? 1 1) ; #t | |
(generic-eq? 1 2) ; #f | |
(generic-eq? 'joshua 'joshua) ; #t | |
(generic-eq? 'elliott 'joshua) ; #f | |
(define list-eq? | |
(lambda (list1 list2) | |
(if (and | |
(null? list1) | |
(null? list2)) | |
#t | |
(and | |
(generic-eq? (car list1) (car list2)) | |
(list-eq? (cdr list1)(cdr list2)))))) | |
(list-eq? '(1 2 3) '(1 2 3)) ; #t | |
(list-eq? '(1 elliott 3) '(1 elliott 3)) ; #t | |
(list-eq? '(1 (elliott) 3) '(1 (elliott) 3)) ; #t | |
(list-eq? '(1 (elliott) 3) '(1 (eliot) 3)) ; #f | |
(list-eq? '(1 () 3) '(1 () 3)) ; #t | |
(list-eq? '(1 ((())) 3) '(1 ((())) 3)) ; #t |
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