On Friday, September 23, 2016 at 1:47:45 AM UTC-5, Francis Avila wrote:
>
> It's not crystal clear to me what you are after, either from this post or
> the one you link to. I think you want a map that does not produce
> intermediate collections and accepts multiple colls as input at a time?
Yes.
> Do you have some pseudocode example so we can be precise?
What I was imagining most recently was something like this:
(doseq* [x (range 3)
y (reverse (range 3))]
(println x y))
which would display:
0 2
1 1
2 0
as opposed to
(doseq [x (range 3)
y (reverse (range 3))]
(println x y))
which displays
0 2
0 1
0 0
1 2
1 1
1 0
2 2
2 1
2 0
What about (run! my-side-effect-fn coll)
>
> This doesn't handle multiple coll at a time like the sequence function,
> but you can tupleize coll with (map vector coll1 coll2) at some loss of
> efficiency. Or you can roll your own.
>
Very nice--I didn't know about run! (!) Yes, that would do it, except that
it requires constructing unnecessary collections when you want to process
multiple sequences. We we able do the same tupelize trick with doseq,
before run! appeared.
However, since we have run!, which is exactly what I wanted a year and a
half ago except that it doesn't handle multiple collections, I would
suggest simply enhancing run! to allow multiple sequence arguments:
(run! (fn [x y] (println x y))
(range 3)
(reverse (range 3))
which would produce:
0 2
1 1
2 0
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