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@temp_list = map { ...1... } ...2....;
print @temp_list;

use Benchmark 'cmpthese';
my @vals = (10_000..15_000);
...
map_void 11.9/s       --     -23%     -50%
map      15.5/s      30%       --     -34%
for      23.6/s      99%      52%       --