In real life, I would normally use a splice like Errto and jdporter.
Before *any* solution, I would put:
die if @ref / 3;
Most elegant, non-destructive Perl5 solution I could think of:
my %out = map { $ref[$_] => [ @ref[$_+1..$_+2] ] }
grep { not $_ % 3 }
0 .. $#ref;
Even better, but requires Perl6:
for @ref -> $key, $val1, $val2 {
%out{$key} = [ $val1, $val2 ];
}
Update: Better yet, this also works in Perl6:
my %out = map -> $k, $v, $w {
$k => [ $v, $w ];
}, @ref;
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