[racket] missing solution 19.1.6 ex:abs-sort

From: Daniel Bastos (dbastos at toledo.com)
Date: Fri Aug 29 10:27:59 EDT 2014

A candidate for a solution.

;; sort1 : list-of-numbers  ->  list-of-numbers
;; to construct a list with all items from alon in descending order
(define (sort1 cmp alon)
  (local ((define (sort alon)
              [(empty? alon) empty]
              [else (insert (first alon) (sort (rest alon)))]))
          (define (insert an alon)
              [(empty? alon) (list an)]
              [else (cond
                      [(cmp an (first alon)) (cons an alon)]
                      [else (cons (first alon) (insert an (rest
    (sort alon)))

(check-expect (sort1 < (list 2 3 1 5 4)) (list 1 2 3 4 5))
(check-expect (sort1 > (list 2 3 1 5 4)) (list 5 4 3 2 1))

No Solution Written, yet Unfortunately, the solution to this exercise has
not yet been written. To submit a solution you have written to this
problem, or to complain that the solution isn't available, please contact Robby
<robby at eecs.northwestern.edu?subject=missing%20solution%2019.1.6%20ex:abs-sort%20>

To see the list of solutions, visit the table of contents
<http://www.htdp.org/2003-09-26/Solutions/contents.html>. Each of the
hyperlinked exercise numbers has a solution.
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