Created
September 30, 2013 14:46
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#lang typed/racket | |
(: div-by (Integer Integer -> Boolean)) | |
(define (div-by y x) | |
(eq? (modulo x y) 0)) | |
(: div-by-3-or-5 (Integer -> Boolean)) | |
(define (div-by-3-or-5 x) | |
(or (div-by 3 x) (div-by 5 x))) | |
(: euler1 (Integer -> Integer)) | |
(define (euler1 n) | |
(foldl + 0 (filter div-by-3-or-5 (range n)))) | |
(euler1 1000) |
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