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Paste # 11292 | ||

2019-11-22 14:52:39 | ||

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;; define foldl using foldr ;; foldl-original : [X Y -> Y] Y [X] -> Y (define (foldl-original f acc lst) (cond [(empty? lst) acc] [(cons? lst) (foldl f (f (first lst) acc) (rest lst))])) ;; define foldl using foldr ;; foldl^ : [X Y -> Y] Y [X] -> Y (define (fold^ f acc ls) ...) (check-expect (foldl^ + 0 (list 1 2 3 4 5)) 15) (check-expect (foldl^ cons '() '(a b c)) '(c b a))