$ ./dave_the_m.pl
Benchmark: timing 1000000 iterations of for, map...
       for:  2 wallclock secs ( 2.03 usr +  0.00 sys =  2.03 CPU) @ 492610.84/s
(n=1000000)
       map:  1 wallclock secs ( 1.12 usr +  0.00 sys =  1.12 CPU) @ 892857.14/s
(n=1000000)