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RyanGlScott/map3.rkt

Created September 3, 2016 16:26
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map3.rkt
(define (map3 f ls)
(cond [(null? ls)
(values '() '() '())]
[else
(let-values ([(x1 x2 x3) (f (car ls))]
[(ls1 ls2 ls3) (map3 f (cdr ls))])
(values (cons x1 ls1) (cons x2 ls2) (cons x3 ls3)))]))
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