These behave like overwriting
> List.^find_method('split').wrap: { $^a.map: *.split($^b) }
> List.^find_method('sin').wrap: *.map: *.sin;
>
but they don't have to, since Aureliano started with "wrap" they can be
actual wrappers:
sub map-over-arg(\A) {my &nextone=nextcallee; A.map:{nextone $_}}
List.^find_method('sin').wrap: &map-over-arg;
List.^find_method('cos').wrap: &map-over-arg;
my @nums = 0, π/2, 3 * π/2;
say @nums.sin; *# (0 1 -1)*
say @nums.cos; *# (1 6.123233995736766e-17 -1.8369701987210297e-16)*
I'm not sure if that can be simplified to use "nextwith" instead of
"nextcallee"–the "map" introduces a new scope which seems to require
"nextcallee"
The example with "split" is complicated by having 2 positionals only the
first of which needs a map, not going to play with that at the moment, left
as exercise to interested readers!
-y
On Mon, Oct 12, 2020 at 9:15 AM Aureliano Guedes <[email protected]>
wrote:
>
>
> On Mon, Oct 12, 2020 at 10:03 AM Brian Duggan <[email protected]> wrote:
>
>> On Saturday, October 10, William Michels via perl6-users wrote:
>> > I can point to the (functional) R-programming language to show what
>> happens
>> > there. When manipulating "array-like" (i.e. vector) objects in R, you
>> can
>> > do nested function calls, or sequential (piped) function calls, and
>> still
>> > get the same data structure out at the end. So a 10-element input gives
>> a
>> > 10-element output.
>>
>> This seems pretty convenient and intuitive. At least, it is possible
>> to mimic that behavior in Raku:
>>
>> List.^find_method('split').wrap: { $^a.map: *.split($^b) }
>> List.^find_method('sin').wrap: *.map: *.sin;
>>
> This is like overwrite the function?
> Might be better just implement a new function, I mean, a new verb as is
> called in R.
>
>
>> my @words = <a,b c,d>;
>> my @nums = 0, π/2, 3 * π/2;
>>
>> say @words.split(',');
>> say @nums.sin;
>>
>> gives us
>>
>> ((a b) (c d))
>> (0 1 -1)
>>
>> Brian
>>
>
>
> --
> Aureliano Guedes
> skype: aureliano.guedes
> contato: (11) 94292-6110
> whatsapp +5511942926110
>
