Yes, it is much better ... Because my code does
something different than yours does. :)
My code turns each *column* of DATA into a
single anonymous array, stored in @AoA so the
print statement gives
1, 4, 7, A, D, G, J, M, P, S, V, Y
Your
my @AoA = map [split], <DATA>;
print join( ', ' , @{ $AoA[ 0 ] } ) , "\n";
gives
1, 2, 3.
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