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List Generation

Use map instead of for when generating new lists from old.

use strict;
use warnings;
...
sub test_map {
    my @sqrt_results = map { sqrt $_ } @results;
}

$count=-1
(warning: too few iterations for a reliable count)
...
      Rate for map
for 2.73/s  -- -8%
map 2.95/s  8%  --

$count=-1

...
Benchmark: running for, map for at least 10 CPU seconds...
       for: 10 wallclock secs (10.11 usr +  0.00 sys = 10.11 CPU) @  3
+.46/s (n=35)
       map: 10 wallclock secs (10.03 usr +  0.00 sys = 10.03 CPU) @  3
+.29/s (n=33)