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(module (algebraic-structures foldable vector base) (foldl foldr)
(import scheme
(only (chicken base) add1 sub1))
(define (foldl f z v)
(let ((len (vector-length v)))
(let loop ((i 0)
(acc z))
(if (= i len)
acc
(loop (add1 i)
(f acc (vector-ref v i)))))))
(define (foldr f z v)
(let ((len (vector-length v)))
(let loop ((i (sub1 len))
(acc z))
(if (< i 0)
acc
(loop (sub1 i)
(f (vector-ref v i) acc)))))))
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