Re: Haskell

On 2024-08-31, B. Pym <Nobody447095@here-nor-there.org> wrote:

Frank Buss wrote:
>

Barry Margolin wrote:

Which reminds me, where's the obligatory Haskell response?

 
No problem :-)
 
Assuming this is what was intended by the OP:
 
(let (res)
  (dotimes (i 11 (nreverse res))
   (dotimes (j 11)
    (push (+ i j) res))))
 
This is a solution in Haskell:
 
[x + y | x <- [0..10], y <- [0..10]]
 

>
It's shorter in Gauche Scheme than in Haskell.
>
(use srfi-42) ; list-ec
>
(list-ec (: x 11) (: y 11) (+ x y))
>
Can it be done with a single "do*"?
>
(do* ((r '())
      (j 0 (mod (+ j 1) 11))
      (i 0 (if (zero? j) (+ 1 i) i)))
  ((= 11 i)  (reverse r))
  (push! r (+ i j)))
>
(0 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 2 3 4 5 6 7 8 9
 10 11 12 3 4 5 6 7 8 9 10 11 12 13 4 5 6 7 8 9 10 11 12 13 14
 5 6 7 8 9 10 11 12 13 14 15 6 7 8 9 10 11 12 13 14 15 16 7 8 9
 10 11 12 13 14 15 16 17 8 9 10 11 12 13 14 15 16 17 18 9 10 11
 12 13 14 15 16 17 18 19 10 11 12 13 14 15 16 17 18 19 20)

This is the TXR Lisp interactive listener of TXR 296.
Quit with :quit or Ctrl-D on an empty line. Ctrl-X ? for cheatsheet.
This could be the year of the TXR desktop; I can feel it!
1> [maprod + 0..11 0..11]
(0 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 2 3 4 5 6 7 8
 9 10 11 12 3 4 5 6 7 8 9 10 11 12 13 4 5 6 7 8 9 10 11 12 13
 14 5 6 7 8 9 10 11 12 13 14 15 6 7 8 9 10 11 12 13 14 15 16 7
 8 9 10 11 12 13 14 15 16 17 8 9 10 11 12 13 14 15 16 17 18 9
 10 11 12 13 14 15 16 17 18 19 10 11 12 13 14 15 16 17 18 19 20)

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