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(functor ((algebraic-structures applicative make) (A (pure map map2)))
(pure map map2 map* apply)
(import (rename scheme (map scheme:map) (apply scheme:apply))
(only (chicken base) sub1 add1 foldl case-lambda)
A
matchable)
(define (curry-n f n)
(let rec ((i n)
(k (lambda (args)
(scheme:apply f args))))
(if (= i 1)
(lambda (x) (k (list x)))
(lambda (x)
(rec (sub1 i)
(lambda (args)
(k (cons x args))))))))
(define map*
(case-lambda
((f x) (map f x))
((f x y) (map2 f x y))
((f x . xs)
(let ((g (curry-n f (add1 (length xs)))))
(foldl apply (apply (pure g) x) xs)))))
(define (apply a1 a2)
(map2 (lambda (f x) (f x)) a1 a2)))
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