Hi Everyone,
I've been lurking quite a while, this will be my first post to perl6
users. I've written a lot of short scripts in perl5 for system admin
type stuff at home and work. Lately I'm playing with Raku, which is a
lot of fun. Error reporting is excellent, as is the online documentation.
To the point. I recently started the perl weekly challenge. Lots of
math/primes stuff. I wrote an algorithm to list all the prime factors of
an integer, using a recursive subroutine. I'm able to print the result
from the subroutine, but it always returns Nil. What am I missing?
#!/usr/bin/env raku
sub MAIN($n = 20) {
.say for factors($n); # Nil
}
sub factors($n, @factors?) {
my @f = @factors.elems ?? @factors !! ();
my $q;
for 2 ..^ $n -> $i {
if $n %% $i {
$q = Int($n / $i);
@f.push($i);
if $q.is-prime {
@f.push($q);
say @f; # [2 2 5]
return @f;
} else {
factors($q, @f);
}
last;
}
}
}
Returns
[2 2 5]
Nil
--
Rick Bychowski
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