SICP問題2.21
square-listその1
(define (square-list items) (if (null? items) () (cons (square (car items)) (square-list (cdr items)))))
square-listその2
(define (square-list items) (map square items))
square-listその1
(define (square-list items) (if (null? items) () (cons (square (car items)) (square-list (cdr items)))))
square-listその2
(define (square-list items) (map square items))