SICP 問題 2.21
(define (square-list items) (if (null? items) nil (cons (* (car items) (car items)) (square-list (cdr items))))) (define (square-list items) (map (lambda (x) (* x x)) items))
(define (square-list items) (if (null? items) nil (cons (* (car items) (car items)) (square-list (cdr items))))) (define (square-list items) (map (lambda (x) (* x x)) items))