2.2.1. Representing Sequences
Exercise 2.21

A list of the squares

The procedure square-list takes a list of numbers as argument and returns a list of the squares of those numbers.

(square-list (list 1 2 3 4))
(1 4 9 16)

Here are two different definitions of square-list. Complete both of them by filling in the missing expressions:

(define (square-list items)
  (if (null? items)
      (cons <??> <??>)))

(define (square-list items)
  (map <??> <??>))

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