;; The first three lines of this file were inserted by DrScheme. They record metadata
;; about the language level of this file in a form that our tools can easily process.
#reader(lib "htdp-intermediate-lambda-reader.ss" "lang")((modname map) (read-case-sensitive #t) (teachpacks ((lib "testing.ss" "teachpack" "htdp"))) (htdp-settings #(#t constructor repeating-decimal #f #t none #f ((lib "testing.ss" "teachpack" "htdp")))))

;; map is a function that allows you to apply a function to 
;; every element of a list and create a new list out of
;; the results.

;; number -> number
;; computes square of x
(define (square x) (* x x))

(map square (list 1 2 5 8 0 -3 -4))
;; expected value 
(list 1 4 25 64 0 9 16)

(map length (list (list 1 2 3) (list 'a 'b 'c 'd) empty))
;; expected value
(list 3 4 0)

(map even? (list 1 2 5 8 0 -3 -4))
;; what do you expect to be returned?


;; use the test examples above to write your own definition of map,
;; call it map1
;; Don't forget the contract!