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我想使用First和Rest遍历球拍中的数字列表,但我不确定我是否正确使用这些函数,因为代码无法正常工作。如何使用First和Rest功能?
(define cubed
(lambda (a)
(* a a a)))
(define (all-elements-cubed a)
(cond
[(empty? a) empty]
[else
(+ 1 (all-elements-cubed (cubed (first (rest a)))))]))
(all-elements-cubed (list 1 2 3 7 5))