Insofar as I understand the (apparently edited) OP, a recursive approach also works (and is almost one line):
>perl -wMstrict -le
"my @a_refs = ([1], 2, [3, 4], [5, [6, [7, 8]]], 9);
;;
sub flatten { map { 'ARRAY' eq ref() ? flatten(@$_) : $_ } @_ }
;;
my @flattened = flatten(@a_refs);
use Data::Dumper;
print Dumper \@flattened;
"
$VAR1 = [
1,
2,
3,
4,
5,
6,
7,
8,
9
];
Note: This also works on the original example (Update (per GrandFather): as it was ultimately updated:)
([1],[2],[3,4]) array.
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