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Message from discussion Anti-Loop
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WJ  
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 More options May 4 2012, 6:27 am
Newsgroups: comp.lang.lisp
From: "WJ" <w_a_x_...@yahoo.com>
Date: 4 May 2012 10:27:22 GMT
Local: Fri, May 4 2012 6:27 am
Subject: Re: Anti-Loop
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WJ wrote:
> WJ wrote:

> > The low, loopy way:

> > (defparameter random (loop repeat 100 collect (random 10000)))

> > (loop for i in random
> >    counting (evenp i) into evens
> >    counting (oddp i) into odds
> >    summing i into total
> >    maximizing i into max
> >    minimizing i into min
> >    finally (return (list min max total evens odds)))

> > ==>
> > (47 9964 543718 46 54)

> > The high way:

> > (setq random (rand 10000 100))

> > (append
> >   (map (fn (f) (apply f random)) (list min max +))
> >   (map (fn (f) (length (filter f random))) (list even? odd?)))

> > ==>
> > (87 9996 522987 49 51)

> Racket:

> (define +random+ (map random (make-list 100 10000)))

> (map (lambda (x) (eval `(,@x +random+)))
>      '((argmin identity)
>        (argmax identity)
>        (foldl + 0)
>        (count even?)
>        (count odd?)))

> ==>
> '(64 9987 526998 50 50)

(for/fold
  ([mini 10000]
   [maxi -1]
   [sum 0]
   [evens 0]
   [odds 0])
  ([n +random+])
    (values
      [min mini n]
      [max maxi n]
      [+ sum n]
      [+ evens (if (even? n) 1 0)]
      [+ odds (if (odd? n) 1 0)]))

 
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