Racket map

(map proc '(l1 l2 ... ln))

• proc is a n-ary Racket Procedure Applies the function proc against all the inputs l1, …, ln

Example

>>> (map (lambda (x) (* x x) '(1 2 3))
'(1 4 9)
>>> (map + '(1 2 3) '(1 2 3))
'(2 4 6)

Tail Call Implementation

(define (custom-map f l)
	(define (map-iter l accum)
		(cond   
        [(empty? l) (accum l)]
				[else (map-iter (rest l) (lambda (x) (accum (cons (f (first l)) x))) )]
		)
	)
	(map-iter l (lambda (x) x))
)