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(define (uniq lst) | |
(define (uniq-detail head tail) | |
(cond | |
((null? tail) (list head)) | |
((eq? head (car tail)) (uniq-detail head (cdr tail))) | |
(else (cons head (uniq-detail (car tail) (cdr tail)))))) | |
(cond | |
((null? lst) '()) | |
(else (uniq-detail (car lst) (cdr lst))))) | |
(define (uniq2 lst) | |
(define (iter residue acc) | |
(cond | |
((null? residue) acc) | |
((eq? (car acc) (car residue)) (iter (cdr residue) acc)) | |
(else (iter (cdr residue) (cons (car residue) acc))))) | |
(if (null? lst) | |
'() | |
(reverse (iter lst (list (car lst)))))) |
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