Function in Scheme that shows the minimum and the maximum numbers (integers) in a list -

is there way make function in scheme receives list of numbers (integers) , creates list maximum , minimum numbers of list ?

i know how make function each maximum,

(define (mini a)  (if (null? (cdr a)) (car a)    (min (car a) (mini(cdr a)))   ) ) 

and mininum:

(define (maxi a)  (if (null? (cdr a)) (car a)    (min (car a) (maxi(cdr a)))   ) ) 

what want 1 function both, in simplest way possible, because i'm new paradigm.

well you're pretty close. use functions have.

(define (maximini a) (list (maxi a) (mini a))) 

a big part of writing scheme programs decomposing functionality separate, reusable procedures. encapsulating min , max behaviour mixture of concerns.

if there limitation of 1 traversal

(define (min b) (if (< b) b)) (define (max b) (if (> b) b))  (define (maximini a)   (let loop [(x -inf.0) (y +inf.0) (a a)]     (if (empty? a)         (list x y)         (loop (max (car a) x) (min (car a) y) (cdr a)))))  (maximini '(-4 3 2 1 10 -5)) ; => '(10 -5)