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Postings from June 2022
Op 27-06-2022 om 11:14 schreef Paul "LeoNerd" Evans:
> On Mon, 27 Jun 2022 02:11:08 -0700
> Darren Duncan <darren@darrenduncan.net> wrote:
>
>> This should be generic and configurable in the same way map/grep/sort
>> etc are.
> I'm not sure I follow this bit. How are those configurable now?
>
> Can you suggest some examples?
>
Map/grep/sort can take a sub which does the comparison/filter. Darren
makes a good observation that that is actually quite similar to your
proposed match/case, where you give the operator. I think what Darren
means is that it may make sense to think about both extending your
proposal to sort and friends and apply a more generic approach to
match/case:
@x = sort : <=> @x; # we need a better syntax than this
and a generic comperator to match/case:
match ($n : sub($a, $b) { $a==$b })
case(1) { say "It's one" }
case(2) { say "It's two" }
...
or maybe
match (sub($a) { $a==$n })
case(1) { say "It's one" }
case(2) { say "It's two" }
...
However, apart from sort using the spaceship operator -- which would
admitedly be very cool and rather useful, I myself do not see enough
value in both operators. So while it would be more generic, I doubt it's
actually useful enough. There may be value with oveloading and custom
infix operators though.
HTH,
M4
HTH,
M4
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